Zed Head

I found this. https://nismoparts.nissanusa.com/parts/nismo-nismo-s15-silvia-reinforced-6sp-transmission-32010rrs50

That's what they call "all in " timing. What the engine would see at open throttle (low intake vaccum), accelerating. It is commonly set at 34 degrees. Do it with the vacuum advance disconnected and watch it as you rev. It should smoothly rise to that number then sit there. If your weights are gummed up or a spring broken you'll be able to tell. If you can't get there then you might be right about the drive gear being off a tooth.

I'd also check the brake booster. Look for signs of leakage/paint peeling at the interface of the MC and booster and beneath. Take the bolts out of the MC and pull it forward to see if there's fluid in the booster. You can do it without removing the hydraulic lines.

So, reading the list of parts, it looks like the person buying has to do the "bellhousing" swap themselves. Which is actually the front case. Hence the need for a fabricated gasket. Precise clearances, etc. Anyway, still very interesting. How do they sell all of the parts for less than just the transmission costs in the states? Parts A, B, and C. Transmission, shift lever, and front case? Takumi Series Package ContentsEvery TS-001 package for L-series includes: TS-001 A 32010-RRS50 NISMO reinforced 6 speed T/M TS-001 B 32839-89F00 NISSAN shift lever TS-001 C1 GIKENCC-OHC* Bellhousing replacement kit for Nismo 6-speed T/M Additional Components RequiredTo complete the installation the following components are required: Custom driveshaft with the correct transmission yoke and length Bellhousing gaskets (to be fabricated by the installer)

You've added the word "design", but your quote only says manufacture. And, the grammar is poor on the S30 page, since it literally says the engine is manufactured by Giken, not the bellhousing. Even if you look past that, it's not clear who designed it. I think that you might be seeing what you want to see instead of what's actually there. S30 needs a better editor for their web page. They should have included the name of the company, GIKEN, after they introduced the program. And maybe somebody just misspelled "this" as his. This company. Who knows. Throw in a few more commas and things become more clear. The overall language is too flowery. Just say what you're doing. That's enough. " partnered with one of Japan’s most respected engineering and prototyping shops that developed an entirely new bellhousing." "In Japanese culture, the term “Takumi” refers to a master craftsman. For decades his company has developed prototype components and engineering solutions for Japan’s leading automotive manufacturers." Looks like they have plans for other "Takumi Series" products. The transmission is #1. "About the S30.World Takumi Series The Takumi Series is a carefully curated collection of components developed in collaboration with Japan’s finest engineers, craftsmen and specialty manufacturers."

Here's another. Still not the one I remember, but descriptive. https://www.classiczcars.com/forums/topic/39246-a-few-questions-about-afm/page/5/#comment-359822

I found one old thread about it. There's another out there somewhere from somebody that had the problem. It's not common. Your pictures actually look pretty good. https://www.classiczcars.com/forums/topic/56998-engine-rough-running-at-wits-end/page/2/

Actually, I miswrote/misremembered. My understanding is that the wall separating the two passages corrodes away. The gases come in one side, pass up through the control valve and then on to the intake manifold channel. If the separating wall is breached you get full time EGR. @siteunseen knows.

I assume that Datsun Works means Datsunworks. He got mentioned four times. They must be aware. Might be where they got the idea. "*Have a NISMO DOHC or a Datsun Works DOHC head on your L-series engine? Ask for the custom DOHC bellhousing kit:" It would be nice to know more about this Takumi company/people/organization. Searching "Takumi" or "Takumi Series" on the internet brings up some odd things. I tried Takumi Motors and found the link below. Can't tell if it's the "most respected engineering and prototyping shop" or not. https://usa.nissannews.com/en-US/releases/nissan-s-legendary-takumi-four-master-craftsmen-who-hand-build-every-nissan-gt-r-engine Are these four guys the ones that designed and built it or is "Takumi" a general term? Who is the "shop"? Or is it one guy? They said "his", below. I do like to know where things come from. Maybe it's a secret. https://shop.s30.world/product/nismo-32010-rrs50-reinforced-6-speed-transmission-to-l-series-conversion-kit "Rather than adapting a weld-on bellhousing solution, S30.world partnered with one of Japan’s most respected engineering and prototyping shops that developed an entirely new bellhousing. Every Takumi Series component is developed by this long-standing Japanese engineering partner, whose decades of experience designing high-performance components for Japanese OEMs." "In Japanese culture, the term “Takumi” refers to a master craftsman. For decades his company has developed prototype components and engineering solutions for Japan’s leading automotive manufacturers."

Odd that a post with a date of July 11th is just posting. How does that happen? It's mid-August. What's the status of the parts?

Derek, is S30.World using your bellhousing? I don't see it on your web site anymore. To be frank, no offense, your web site could really use some work. I know the business is a side-project though. Good luck with it. https://www.classiczcars.com/forums/topic/65204-trannydiff-ratio-and-rpm-speed/page/2/ https://datsunworks.com/ https://datsunworks.com/Blog/

I tried it again and it worked. Who knows... I wonder how it compares to other kits out there. Looks very interesting. The price seems very reasonable. Sorry to divert your thread Derek. https://www.instagram.com/reel/Dbp2YSFsiU5/ https://nismoparts.nissanusa.com/parts/nismo-nismo-s15-silvia-reinforced-6sp-transmission-32010rrs50 https://www.godzillaraceworks.com/drivetraintl70/tl70swap

I wonder if these guys might see an opportunity. They sell the tanks. They should know about the need. Apparently they have a rubber parts supplier. Check out their 6 speed too. Somebody should tag them. https://shop.s30.world/rubbers https://shop.s30.world/fuel-tanks https://shop.s30.world/product/nismo-32010-rrs50-reinforced-6-speed-transmission-to-l-series-conversion-kit Somebody should tell them that their gear ratio graphic is messed up.

Would be a good idea to check the EGR passages. The sealing surfaces are known to corrode and leak.

For my 76 I found a length of repair tubing at OReilly Auto that was the proper length with proper fittings. You can use a piece of wire or string to run the bends and get the length. Take the old piece in to the store and compare to get the fittings right. Then I built a bending jig with a piece of 2x4 and some wood screws to get smooth bends. Just put the old line on the wood and place the screws, then bend the new one carefully. A fun project. Mostly thought work, the bending wasn't that hard. It's not restore work, I think the tubing had a green coating. But it was new when it was done.

Somebody got a pretty good deal on what should easily be a running and driving Z project. Half-shafts are easy. Fix those fuel hoses on the rail though. They look ready to blow. Maybe they'll join the club. https://bringatrailer.com/listing/1977-datsun-280z-151/

Nope, I am fully exposed. I did figure out one thing but not sure why it changed. My default language got changed to Spanish on BAT, when I clicked through from a GMail acct. Not sure why, it wasn't me. Took a minute to figure out, I didn't even know BAT had the option. Wonder why they chose just five languages.

Today, I clicked on a link from a Google search that led to a foreign lanaguage version of Bring A Trailer. Now when I click on a BAT link in an email notification it comes up in this foreign language. What the heck is going on? Why am I being taken to the "ES" site? Is it AI? It seems to be happening in transition, after the click. I can see the url when I hover over the link and it doesn't contain the es.

Here's another old thread with some pictures of what look like unmachined heads, except maybe the first one. You can probably estimate how much has been cut. Pictures of what you're working on would be neat. https://www.classiczcars.com/forums/topic/63727-cylinder-head-numbers/ craZylair supplied these -

It made a Japanese web site also. https://plaza.rakuten.co.jp/hybrids30rb26/diary/200611160000/

Found a Youtube with it. It has handlebars. At 10:27 https://youtu.be/st6UWRe_Tuw?si=6tj1ToHsuf6xdlvX&t=627

Found an old thread... https://www.classiczcars.com/forums/topic/68671-timing-chain-tensioner-extended-too-much/page/3/

You can measure the head and install the shims without removing the head. It's hard to find the standard thickness though, I see a wide range of numbers reported out there. I'd thought that it was 108 mm, but not sure. Regardless, if the head's been shaved the chain will be looser if the cam towers haven't been shimmed. It's just a fact of machining.

The sprocket position (1, 2 or 3) won't affect chain tightness. It only affects cam timing. Did he have the head resurfaced after the damage? If so, did he use shims to raise the cam towers? If not, that could be the problem. https://zcardepot.com/products/copy-of-cylinder-head-cam-tower-shim-set-240z-260z-280z https://www.google.com/search?q=datsun+head+saver+shims

But, on the topic of parts, here's one that's close to that. Seems like it could be saved though. Could be a good starter Z. Cleveland, OH. Somehting funny. Whenever I cut and paste something from BAT, I get logged out. I wonder if it's an AI scraping prevention thing. https://bringatrailer.com/listing/1977-datsun-280z-151/