HS30-H

What did I twist? You haven't answered any of the points I made. You MISREAD the information offered in the post I made ( the scan and the part number ) and you also MISUNDERSTOOD my intention. You then went on to attack me for posting on the thread, accusing me of having an "agenda" - when you obviously had an agenda of your own. The "education" ( and thank you for casting the aspersion ) would be - again I point it out to you - in the RELEVANT and CORRECT information contained in the file attachment. You honestly think my "Here's a toast...." reply to the quoted figure of "00.9999997%" was in some way disrespectful? I don't think you understood it anyway. You want to censor me for making a flip retort to a stupid number ( which was quite obviously not serious )? I think I replied in a fitting manner, and a manner that showed I was ready to take the debate further. You think I have NO RIGHT to do that? That will save you the trouble of explaining how you managed to misunderstand my post and the information it contained, and the answers I gave in 'defence' of your ridiculous attack ( which was off topic anyway ). Is that a final insult for good measure? I notice you use this like it is a quote from me, when they are your words and your words alone. If I had such an agenda ( and incidentally - I don't think I do ) you would have to admit that I'd have my work cut out, wouldn't I? Especially with people that don't WANT to know the whole story about these cars. That would appear to include you. I noticed you all but told me that we shouldn't discuss the Air Con issues in another thread because a definitive conclusion could not be reached. In that case we might as well start turning the lights out...... For what its worth, I spend a fair amount of time on the forum of a UK-based Z owners club, and ( yes - you guessed it ) I seem to spend a lot of time bringing to people's attention the fact that the S30-series Z cars were / are a whole family of models, and that they were sold all over the world. This normally entails bringing to attention things that some of the UK-based forum members there do not want to hear. So am I anti-British too? I also belong to a Japanese club for the S30-series Z cars ( that means a club based, yes in Japan ) and travel there quite often - sometimes finding myself being asked about the UK-market versions and their parts / variations. Funnily enough, they seem pretty open to the idea that the S30-series Z was a 'family' of models. How refreshing. I have a pretty big archive of data to back me up, and I think ( I believe this is true ) some of what I have posted / talked about has been useful and has been appreciated. I'd be pleased if it was sometimes entertaining too, but I don't expect everybody to understand my writing style or my particular brand of humour. You might also notice ( if you pay attention ) that if I don't know about something I tend to keep my fingers away from the keyboard, watch, read and ( hopefully ) LEARN. As I mentioned in a previous post on this thread - if you don't like what I write or how I write it, then you have some options open to you. Bit I'm not going away just because 'moonpup' wants me to. Alan T.

What you thought I was implying is up to you. I already told you that I was replying directly to the "99.9999997% sure its aftermarket" quote, and my post reflected that fact. The inference is clear when you look at the scan I posted: A Factory-fitted option for the L-series six engines in the S30-series Z body DID EXIST. You think I would post an illustration with the express purpose of misleading? I resent that accusation, and I think you ought to retract it. It is QUITE CLEAR that you have completely misunderstood what the scan illustrates, and what model of car / engine the parts were designed to apply to. See below: "JDM models"? It is quite clear that you completely misunderstood the illustration and the part numbers that were part of the file's name. Go back and have another look ( again ). And to make this perfectly clear: The scanned page I posted came from the Nissan ( Factory ) 'R-Drive' parts manual for the RHD Export market '240Z' and '260Z' models. You might like to note that this manual does NOT include any "JDM" model information, and specifically does NOT include any information on the S20 engine and its oil cooler kit. It seems quite clear to me that you assumed that the scan related to the "JDM" market models, and the S20 engine in particular. You were wrong. You're doing it again. There WAS a Factory Oil Cooler kit option ( in the EXPORT market ) for the L-series sixes. Just because it was never 'officially' offered on the HLS30U model doesn't mean that the parts might not show up on a particular car. Close your mind to the information that a Factory oil cooler kit DID EXIST and you will NOT have the whole truth at hand. The Factory kit for the L-series sixes was made from early 1970, and was first made available through the 'Sports Option' lists. It could have shown up NEW on a 1972 production car, or at ANY time subsequently as a retro fit. Sure. It might be pure "aftermarket". But I wonder if my definition of 'aftermarket' is the same as yours? I wonder if you would call an 'Interpart'-supplied item 'aftermarket'? For sure an item from 'Cal Custom' would be 'aftermarket' - but how about 'Datsun Competition - USA'? Would you class that as the 'aftermarket'? Look at the part number that forms part of the file name in that scan I posted. Same as the 'Datsun Competition' kit. The Factory parts manual page scan is relevant, on topic, possibly helpful to the person who posted the question ( whether his kit is the same or different ) and - at least I think - worthy of being added to the debate. You might also like to note that I was the FIRST person to post hard data on the thread instead of conjecture and guesses. Member 'NY "Z"' may well have a pure 'aftermarket' ( ie - non-Factory ) kit on his car. In which case montoya_fan01 might be right with his "99.9999997%" comment. But nevertheless, a Factory-fitted and specifiable option kit DID EXIST for the Export cars, and I have shown this to be the case. There is therefore - implicitly - the possibility that one of these could have ended up on an HLS30U. And let me make one thing clear to you. Something that I want you to take on board and remember: It was possible to buy an HLS30U as a NEW CAR in Japan right from the beginning of production. Any foreign national could do this by approaching the 'Diplomatic Sales Division' in Ginza, Tokyo and laying down the money required. This car could be registered in Japan and driven on the public highway, or exported to the territory of the buyer's choice. Such cars COULD ( and DID ) have the choice of adding ANY Factory option that would work on the model and type. Such cases DID exist, and there are known examples to back it up. Some of them even ended up being taken to the USA. How can anybody say for sure that member 'NY "Z"'s car is not one of these? Therefore, closing your eyes to the options and specifications NOT initially offered to the HLS30U model in its particular export market - but available on others - will lead you to an incomplete conclusion. Instead of chastising me for my "agenda", you might like to pay a thought to chastising those who actively seek to keep the whole truth from you, or who themselves hide from the complete story of this family of cars because they are convinced that some of the story is "irrelevant". Think about it. I don't know. I have never tasted it yet. Perhaps you can tell me, as you appear to have black feathers in your teeth. Alan T.

Oh yeah? Read on........ Did I mention anything about what you call "the U.S. export/240z model" in my post? I don't think I did, and I believe that the point I was making was quite clear ( unless you are blinded by a preconceived concept regarding my "self imposed agenda".....). A Factory-fitted option for an oil cooler did exist. I suggest you look a bit more closely. If you don't think that the oil cooler system shown in the scan I posted is for an L20A/L24/L26 then I would like you to tell me which engine it would fit? If you have been misled by the outline drawing of the valve cover then er, well - you have been misled. That's not an oil cooler system for the S20 engine ( the filter adapter wouldn't fit and the oil pump shown is clearly that of an L-series engine ), and the fact that this Factory parts manual shows the oil cooler system against the silhouette of what might be an S20 engine is just another slight mistake in the Factory literature. There are many more. You do realise that, don't you? On the contrary. A Factory-fitted oil cooler system option for the L-series six did exist, and I posted a scan of it from a Factory parts manual. I wasn't saying that it was offered on the USA / Canada export market models, I was merely pointing out that IT EXISTED AS A FACTORY OPTION PART. If you look at my post, I was answering this quote: Or did that go over your head? Seeing as you have brought this subject up, and have aimed some mud at me, I'll make this point: Ignoring the plain fact that the S30-series Z cars were a family of different models during design, during engineering, during productionisation and at launch in Japan is probably one of the single biggest mistakes that a historian or inquisitive enthusiast can make. Ignore that fact - focus on ONE market, ONE model and pretty much ONE spec - and you are ignoring some of the very reasons why that model turned out the way it did. When I first signed up on this forum, I saw a LOT of questions that could be answered by showing examples from market versions other than the USA / Canada export market version. I have made efforts to demonstrate that these other market versions are both important and significant in the history of the S30-series Z. Like it or not ( and it is amazing how many people seem not to like it, isn't it? ) the designers and engineers took these other market versions into account when they were designing 'your' HLS30U. Shut your eyes to that fact and you are blinding yourself to the HLS30U itself. I'm convinced that the presence on this forum of enthusiasts for the Japanese home market models and the Australian, NZ, UK and yes - European mainland export versions has broadened the knowledge base and awareness for all of the first-generation models. That includes the HLS30U, and it is NOT a one-way street. WE are ALL learning here. If you don't like me or my posts, then I recommend that you put me on your 'ignore' list. I can't tell you how that works or how threads will look to you as I have never personally put anybody on my ignore list. I think it is worth seeing what everyone has to say rather than burying your head in the sand. Either that or get a group of like-minded individuals together and see about getting me banned from the site. Maybe start a new thread on the subject? Thanks for letting me know what you think about me. I'll add you to my list of 'Alan T Fan Club' members Alan T.

Well, Here's a toast to the 00.0000003%.........

You've got the codes mixed up. 'S30-S' = Fairlady Z ( 'Z STD' or 'S' model to the factory ). This was the super-basic 'no frills' model. Rubber mats, no hubcaps and plain bumpers etc....... 'S30' = Fairlady Z-L ( 'Z Deluxe' or 'D' model to the factory ). This was the 'Luxury' version with carpet, hubcaps, rubber bumper trim and a free copy of the theme to 'Man In a Suitcase' on 12-inch vinyl.

As I mentioned before, this is not my personal all-time 'Top 10'. In fact, I don't think any of the particular cars I posted would be in my all-time top ten of Japanese race cars....... The list is intended as a practical suggestion for vehicles that are of historic interest, currently running, owned by either Nissan or NISMO in Japan, and could feasibly be taken anywhere in the world to be demonstrated.

Next: Nissan NP35 - this closed-roof sports car was built in-house at NISMO for the 1992 JSPC. Its 3.5 litre normally-aspirated VRT35 V12 DOHC engine produced 630ps at over 12,000 rpm is a joy to hear on song. I selected this car because it is unique, it is running and active, and I think it is absolutely beautiful. Killing two Skylines with one stone: The KPGC10 Skyline GT-R was the model that brought the majority of wins in the GT-R's famous '50 Victories'. I think it needs very little explanation here, and surely an American ( or Australian, NZ, European, British..... ) audience would love to hear a race-tuned S20 engine on song? I don't suggest any particular car here, as privateers in Japan have some of the cleanest and fastest examples that are still active. The CALSONIC-sponsored Group A Nissan Skyline GT-R needs no intro here either. The CALSONIC-liveried cars were always the hottest Works entries with the latest updates and the most powerful engines. They also had - arguably - Nissan's hottest drivers at the wheel. They won so many races that the series had to have its rules changed. I watched these things make RS500 Cosworth Sierras and BMW M3s look like pedal cars at tracks like FISCO, Sugo, Tsukuba and Suzuka. They still look fast today. The CALSONIC-liveried cars are probably the most readily recognised, but the TAISAN / STP and Reebok liveried cars ran close, along with a gaggle of others. Not forgetting the 'Winfield' sponsored examples in Australia either. Again - as I have tried to make clear - the list I made consists of cars that COULD be taken anywhere in the world and run with little problem. Totally academic considering Nissan's intransigence, but a practical suggestion nonetheless........

Next group: Nissan Cherry X-1 ( KPE10 ) - this car competed in the 'TS' race of the 1973 Japan Grand Prix meeting. Its A12 4-cylinder OHV engine was a low-tech 'screamer', and the TS races were where Nissan duked it out with their rivals at Toyota. Nissan Sunny Excellent ( KPB110 ) - this car was the winner of the 'TS' class race at the 1973 Japan Grand Prix meeting. Its 16-valve DOHC LZ14 engine was essentially a Formula Pacific race engine, producing 200ps on Nissan's 'ECGI' injection setup at over 10,000 rpm. Again, this class was the arena where Nissan fought their battles with Toyota - winning hearts and minds on the race track in the hope of winning sales in the showroom. Fairlady 240ZR ( HS30 ) 1973 - this car has a slightly mysterious history, but was built as a full 'Works' Group 4 'aerodynamic' race car in-period. It ended up as one of the Nissan Racing School fleet of pensioned-off race cars and then sat in NISMO's collection for many years. A few years ago it was restored by NISMO, and it features many trick original Works parts - such as its 'LY28' SOHC crossflow engine. The car is painted to replicate a famous livery used by the Works cars in period. Now usually driven at NISMO events by arch exponent of the S30-series Works circuit race cars Mr Haruto Yanagida ( of 'Central 20' renown ) who still drives with verve and excellent speed. Skyline Super-Silhouette - ( KDR30 ) Tomica / Hasemi Motorsport - this car should need no introduction. Built for the short-lived 'Super Silhouette' formula in 1982/83 - this car dominated the series. Its LZ20B engine was turbocharged to produce 570ps and a distinctly on/off nature ( whilst spurting huge flames from its side muffler outlet )that led to the necessity of a unique driving style from pilot Masahiro Hasemi.

OK Ron, here is my list again - this time to follow up with photos and brief explanations: *R380-II - GR8 engine - 1967. *R381 - Chevrolet V8 engine - 1968. *R382 - GRX-3 V12 engine - 1969. *Skyline GT-R ( KPGC10 ) - S20 engine - 1971. *Cherry X-1 ( KPE10 ) - A12 engine - 1973. *Sunny Excellent ( KPB110 ) - LZ14 engine - 1973. *Fairlady 240ZR ( HS30 ) - LY28 engine - 1973. *Skyline Super-Silhouette - ( KDR30 ) - LZ20B engine - 1983. *NP35 - VRT35 NA V12 DOHC engine - 1992. *Group A Calsonic Skyline GT-R ( BNR32 ) - RB26DETT engine - 1993. First photo is the recently-refurbed Nissan R380-II pictured at the last NISMO Festival, which took place in December 2005 at Fuji Speedway in Japan. This car is claimed to be the actual car that set a great number of international speed records at Yatabe in 1967 ( the second record-breaking run for the R380 at Yatabe ). Second is the also recently-refurbed Nissan R381, again pictured at the 2005 NISMO Festival. This car is the 1968 Japan Grand Prix winner, and the innovative twin-pitching 'active' rear wing is fully functional. Third up is the Nissan R382, which was rebuilt a couple of years ago. This car is the 1969 Japan Grand Prix winner. The 6-litre GRX-3 V12 DOHC engine had to be built up from several display engines that had not run for over thirty five years.

Ron, This thread seems to have very little in common with its title now. And that's not a complaint, that's an observation. In view of the fact that the thread has turned into a plea for Nissan's participation in / sponsorship of an American 'historic' car event, I came up with the following: OK, here's a list of TEN cars. All of them are currently owned by Nissan and NISMO in Japan, and all of them are in running order and can be demonstrated at something close to full racing speed on a race track. They would need to be brought over from Japan to the USA along with a skeleton staff of mechanics and spares to run them, but I would not have thought that this was an unsurmountable problem logistically or financially. They might need two or three Japanese drivers that are familiar with them too. I would choose Moto Kitano and Haruto Yanagida, as between them they have driven the majority of these cars either in period, or at Japanese events within the last few years. These two are part of Nissan's racing heritage ( whether they like it or not ) and ought to be interviewed by a few English-speaking journalists before they forget more than they remember...... *R380-II - GR8 engine - 1967. *R381 - Chevrolet V8 engine - 1968. *R382 - GRX-3 V12 engine - 1969. *Skyline GT-R ( KPGC10 ) - S20 engine - 1971. *Cherry X-1 ( KPE10 ) - A12 engine - 1973. *Sunny Excellent ( KPB110 ) - LZ14 engine - 1973. *Fairlady 240ZR ( HS30 ) - LY28 engine - 1973. *Skyline Super-Silhouette - ( KDR30 ) - LZ20B engine - 1983. *NP35 - VRT35 NA V12 DOHC engine - 1992. *Group A Calsonic Skyline GT-R ( BNR32 ) - RB26DETT engine - 1993. Now, who wouldn't want to see that group fired up and driven hard? This is not my "Dream Team" by any means; I could easily come up with a list of over 100 Japanese race cars that I would like to see driven hard on a race track once again - but 95% of them don't exist any more. The remaining 5% still exist but are not all in full running / racing order. That list would only start to approach the title of this thread, and it would be fun to discuss - but I'm trying to be practical here. The above ten cars COULD be sent virtually anywhere in the world to be demonstrated. Probably too late for the Mitty, but people need to be lobbying NOW for events two or three years in the future. Many of the major auto manufacturers in the world now participate in events such as these, and do it as a part of their advertising and promotions budget. The current regime at Nissan need to do it too. Even one or two special ( rarely seen / historic ) cars would be better than nothing, and would generate many column inches of free coverage that would otherwise have to be paid for. Nissan are still struggling internally over matters such as these ( and they still don't have a proper museum in their homeland ) but they need to catch up with their peers and the time to start is now. Alan T.

Just to follow this up - I have searched for the part numbers of the seat cushion 'guards' and I too drew a blank. The earliest Japanese parts lists I have ( dated November 1969 ) show them in the illustrations but don't give part numbers. This is surprising, as just about every other single nut, bolt and component of the seats is listed. Same situation with the RHD Export parts lists. The Japanese market 'Service Shuho' booklets ( issued to the dealers to clue them up on the new models ) also have illustrations that explain the seats and their workings. The seat guards can be seen, but are not mentioned. My *guess* is that they were already decided to be surplus to requirements by the time the parts catalogs, Service Shuho booklets and factory workshop manuals were being compiled. But I'll keep my eyes open.

Ron, Don't take this as a personal dig, but I notice you don't have a single Japanese-prepped / Japanese-driven / 'Works' purpose-built race car in your list......... Every single car in your list appears to be a car modified from a standard production road car - as opposed to a limited-run homologation special or 'real' ( read: purpose designed ) race car. They also all appear to be cars that raced exclusively in the USA. OK - so the purpose behind this is to lobby the organisers of the Mitty to include ( invite / sponsor / subsidise? ) some certain cars in their event, and we have to take the thread title with a pinch of salt - yes? Therefore it would ( surely? ) be a good idea to lobby for cars that actually still exist........, and have a good chance of showing up should they be invited - yes? But still, it would be nice to see some cars from outside the USA domestic race scene being included in a list with the title "10 Best Japanese Race Cars of All Time.".......... I think that needed to be said. Good luck all the same. Alan T.

Well, it looks to me as though the original Japanese market system would not be a 'bolt-in' fit to the first LHD cars. The heater casing of the pre-August 1973 LHD cars has its inlet duct on the right, the fan housing is on the right and the air intake from the cowl is also on the right. The LHD cars would therefore need their own design of air conditioning components rather than sharing the Japanese market parts. Well, the illustrations I scanned and posted above are from the June 1974 issue Factory Parts Catalog for the 'Datsun 260Z. 240Z, model S30 series, USA & Canada' ( Nissan Pub. No. C-001OU ). Section 27 ( 'Car Heater up to July '73' ) has 5 pages of illustrations showing the inlet duct and fan housing on the right. Section 27A ( 'Car Heater from August '73 ) has 7 pages showing the inlet duct and fan housing on the left. The same manual also has the ( new for August '73 ) Air Conditioner system illustrations in Section 29 ( three pages on the interior components ) and these all show the inlet duct and fan housing on the right........ Does this mean that the illustrations in Section 27A are actually wrong? No, but then why would it ever need to be? I mentioned it because I thought it might be significant. I saw the illustrations showing the - apparent - movement of the air duct and fan housing right at the date the Factory air con system was phased in on the LHD models. All of this would be easy to put to rest straight away if the illustrations in section 27A of the parts catalog are incorrect. I've seen a few little mistakes in other Nissan parts catalogs and workshop manuals for the S30-series Z, but this one is a biggie and I've never seen any reference to it. But going back to my original point - the Japanese market got the option of an air conditioner system designed for the ( RHD layout ) car and it was available right from the beginning of sales in late 1969. The USA & Canada market on the other hand ( a market that included territories where I would have thought an air con system was de rigeur ) did not get this until August 1973. In the meantime - ie from early 1970 to late 1973 - some dealers and private owners in the USA were fitting aftermarket air con systems to their cars. That's a long time. Especially when the Japanese market ( which gets very hot and humid in Summer ) had a perfectly good system designed for the car and available Factory-fitted as a specifiable option. Surely it would have been simple for Nissan to incorporate a Factory-fitted air con system into the LHD cars from the beginning of production? Why didn't they do that? I have my own theories, but I'm interested to hear what anybody else thinks. Alan T.

That's not what I see in the Factory parts catalogs for the LHD models. Look at these two scans. First is 'up to July '73', second is 'From August '73'. Blower motor and Intake Duct etc clearly moves from the left side of the dash to the right in July / August 1973 on LHD cars. Please tell me I'm not going nuts..........

Hi Stephen, As far as I understand it ( certainly looking at the Factory parts catalogs for the LHD models ) the complete layout of the LHD heater system changed in July / August 1973. Previous to July August 1973 the blower unit was under the RIGHT hand side of the dash on LHD models ( as opposed to the LEFT side of the dash on RHD models - as illustrated in the scan I posted ), and post July / August 1973 the blower ( and all its attachments ) moved over to the LEFT side of the dash - just like the RHD models. Am I right?

For reference purposes: Scan from the Nissan 'Service Shuho' booklet no.184 ( the first for the S30-series Z ) which introduced the new model series to the Japanese dealers. Dated November 1969:

As a matter of fact, the S30 was designed to incorporate an air conditioning system. The Factory was fitting a very comprehensive system right from the beginning of sales to the general public in late 1969. Of course this was on Japanese home-market models, and not the HLS30U. Whether it actually worked as well as some people would have liked is another ( different ) discussion. Another interesting discussion might be whether the original Factory air conditioning system was not offered on the HLS30U because it was designed for an RHD configuration, and only an RHD configuration - which would be interesting..........

To clarify the clarification: The mesh grill that gogriz91 has purchased is the same type as those fitted to the S30 ( 'Fairlady Z-L' ), S30-S ( 'Fairlady Z' ) and PS30 ( 'Fairlady Z432' ) from the start of production in 1969. All three models had the same size mesh gauge. It was the PS30-SB ( 'Fairlady Z432-R ) that had the different gauge mesh, and this part has been discontinued for more than 30 years now. No, it is a stock Nissan part - just like the originals were in 1969. To expand on this a little, Matsuo says it was the 'bean counters' who foisted the use of the mesh grilles on the home-market models due to cost cutting. However, this makes it sound as though the mesh grilles were created simply to cut costs - which was not the case..... In fact, the 432-R model was always going to have a mesh grille, as the slat-type grille would have laid its large oil cooler ( mounted in front of the radiator ) open to stone damage. The 'bean counters' pinched the low-cost mesh grille and imposed it on the other home-market models - but with a different mesh gauge. True story.

Lachlan, The Isuzu Bellett GTR ( with the G161W engine ) didn't debut until September 1969, a full six months after the PGC10 Skyline GT-R. I think you are possibly getting your GTs mixed up with your GT-Rs?

26th-Z, Have you any idea what Katayama meant exactly when he described the 'Datsun' name as having "purity"? I certainly don't see how the 'Datsun' brand lineage could be described as "pure"', especially if this is implying that the 'Nissan' company lineage was in some way 'impure'. Sounds to me more like Katayama politics than anything else. I'd be interested to hear otherwise.

What I find amazing about this auction is that the vendor has the balls to write this: "Up for auction is a very desirable 1972 Skyline GTR." The auction title also states: "1972 Nissan GTR". If that isn't the most blatant misrepresentation then I don't know what is. Only Nissan could make a GT-R. Nobody can take a GT-X, swap a few parts around and call the car a 'GT-R' - especially without the S20 engine. Shocking.

You are definitely on the wrong thread, d***. This is the 'Carl Beck Big-Ups His Dune Buggy' thread.........

I'm not happy to have that kind of sobriquet applied to me, even if it is meant kindly. It makes it look as though I might even believe it myself - which is for sure not the case. Of course there is an absolute wealth of things that most of us don't know about the history of these cars and the companies and individuals that made them. It is a great challenge, and any fresh information that we glean tends to open up the possibility of further questions we hadn't even thought of. And so it goes on...... But where the information is already at hand ( as in the case of the genesis of the Nissan 'L-gata' engine ) it would be nice if it was passed around properly and recorded correctly. But instead we have advertising copy and sales flannel taken as gospel. It is very frustrating. Unless you can type his full name into the Japanese search engines ( in Kanji or possibly Katakana ) you probably won't get much in the way of results. The World Wide Web is not necessarily the fount of all wisdom just yet....... Perhaps you shouldn't expect too much from it. You'll have to immerse yourself in some Japanese books and old magazine articles to satisfy some of your curiosity about the man. Alan T.

Agreed. The L-gata was a Nissan in-house design, and was not a direct relation to anything from Prince. The S20 was Nissan's development from the Prince GR8 ( not the G8 ). First the Prince GR8 was re-badged the 'Nissan GR8', and then the Nissan S20 engine was developed. The S20's DNA was from the GR8, but it was effectively a completely new design. To make a direct link between the S20 and the RB-series engines is a little misleading. There's a stepping stone between them, and that stepping stone was the FJ-series. The FJ was effectively a four-pot successor to the S20, and shared many design details. There are even some valvetrain components which are interchangeable. The RB-series was conceived as a practical successor to the L-series, and the RB26DETT ended up as a spiritual successor to the S20. There is a certain amount of 'what comes around goes around' in the story, as the Nissan L-series engine debuted with the L20 six in the H130-Series 'Cedric Special Six' - a top of the line Sedan. The RB-series engine debuted in the 1984 Laurel - also a top of the line sedan. Head of the design and development team for the RB-series engine was Mr Shinichiro Sakurai - the man ( sometimes known as 'Mr Skyline' in Japan ) who had overseen the motorsport activities of Prince, and who was the chief engineer overseeing the design and development of the GR8, S20 and FJ-series engines. That's quite a blood line. How often do we read and hear that the Nissan L-series engines originated with the L16 of the 510 Bluebird? It is an oft-repeated mistake, and has now become all but set in stone. Of course it is a completely FALSE story ( most likely originating in American advertising for the HLS30 ), as the 4-cylinder versions of the L-series engine came after that L20 six in the H130 'Cedric Special Six'. Designer / Chief Engineer of the L-series engine? Mr Hiroshi Iida. We really ought to remember his name and sing his praises more often than we do........ Alan T. ps - sakijo: Thanks for starting this thread.

Please don't take this personally, but I think your 'family tree' is dysfunctional...... It makes it look as though Nakajima ( note the spelling ) and Tachikawa came before most of the companies listed below them ( which is not the case ) and it also makes it look as though the Nissan Motor Co. Ltd. didn't exist until PMC was merged with it - which is also not the case. Please also note the spelling of 'Kaishinsha' ( it is not 'Kwaishinsha' ) and in fact it would be more accurate to split it into two words; 'Kai Shinsha'. And what's with the inclusion of 'Infiniti' ( it makes it look as though 'Infiniti' is a company all on its own, and is the result of all that went before it )? Like I said, please don't take it personally. I just think it is dangerous to make family trees like this when the story is a lot more complex and convoluted than such a graphic device can portray. Alan T.