Engine & Drivetrain
Post messages here about engine mechanics, exhaust, intake, etc. Anything to do with the engine system as a whole.
5,568 topics in this forum
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I have a 240z with a l28 motor it runs strong when it is cold and when it warms up it will cruise along the bam like you hit a wall will cut out. I thought it might be in the coil or distributer but am not sure. I also thought it could be vapor lock, but have never had any experiance with it. The car is new to me and came with this problem and for more history on it it has a new electric fuel pump and a Carter AFB carburator. Any input is appreiciated thanks Paul
Last reply by 2ManyZs, -
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You've all seen some bizarre posts here, but this one may well be near the top. I've just agreed to buy a valve grinder and seat grinder, with no intention of using it commercially. It's solely to support local Z enthusiasts and whoever else wants to participate in low-cost high-value engine rework. I'll also be attempting to develop a rework procedure for rocker arms. Obviously, this is not hi-performance work, but an attempt to assist the bottom-feeder (I know you're out there). Since I have no knowledge of this process, and no one to teach me, I'll be learning by doing, which leads to the point. If you have any surplus, but salvageable, valves (44mm intakes and 35…
Last reply by emitch, -
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Howdy all, I have a 73, early SU's with air horns and ITG filters. I have started putting lower octane gas into my tank and have not really noticed a performance drop. Hills are fine, temperature and predetonation are fine. My question is: How important is it to have a lead substitute for our Z's without the hardened valve seats? It drives me crazy. The day CA gas went to that stupid MTBE crap, my gas mileage went from the mid 20's (22-26) to the low 20's high teens (16-21). Is that just the gas, or am I missing something else? If anyone has any info, shoot it my way!
Last reply by Eftusk, -
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I'd like to know if it is possible to remove the big retangular box for the air filter and put instead rounded air filters like K'N ?? Any other brands and things that will need to be made on tne carbs settings?? Is it hard to do? Merci!
Last reply by Eftusk, -
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quick question....ijust noticed that my vacuum advance is hooked up to manifold vacuum.Duh..or on a 240 is it supposed to be? i wouldnt think so. if not, where on downdraft webers could i get venturi vacuum? i looked and didnt see anything. thanks for any help-kris
Last reply by snootcheez, -
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Ok, here is what I was able to gather form the previous onwer.. He told me that the car was caughing a blue puff of smoke each time he was shifting the car.. So, is it the valve seals or the rings or worn valves? help me!
Last reply by guy_geo, -
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Has anyone done any experimentation on Manifold lengths with their triple carbs? I have the 6" Cannon with a set of triple 44 mikunis and 39mm venturis. The problem my car has a huge flatspot up near 4500-5000rpm. Past that it pulls well up to the 7200rpm redline. Prior to this venturi change, I had changed my cam from a 276 .515 lift cam to a 284/294 .515 lift split duration cam, looking for more power past 6500rpm. The cam didn't seem to add much power until I installed the 39mm venturis. After I did that it had enough breathing capacity to pull to the higher revs. I spoke a little to Dave Rebello of Rebello Racing and he says for my setup, the manifold in combination o…
Last reply by Phred, -
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I have a 280zx with p90 head and flat top pistons. Can anyone enlighten me as to how to get the compression tp 10:1 (without spending too much cash) and it should run on normal pump gas shouldnt it? Thanks Wes
Last reply by 2ManyZs, -
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just wonderin if anyone has ever hear of, or done, a late model 300zx twin-turbo in a 240z or up to a 280z? still looking for more power and just thought that it would be awesome if it was possible.
Last reply by 2ManyZs, -
250+ bhp 1 2
by snootcheez- 13 replies
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Hey all...i was jut wondering if its possible to get 250 or more hp from a 2400. i want it to be a daily driver and not cost too much. i was considering a 5.0 ltr efi swap but i still think having a strong 6 would be just as good. i am currently working on my 73 240z and trying to get some ideas before i start really finishing it up. if anyone out there has achieved this id really like to know and what kind of eng work did you have to do? thanks for any advice. kris the engine is stock and original except for the downdraft webers.
Last reply by byunique, -
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Hi all, Who makes the best electric fuel pump for the early Z's? I noticed that Motorsport Auto has them either new, rebuilt, or performance types. Are the MSA rebuilt pumps any good? I ended up removing this pump over the weekend. When I connected 12v to the thing... it did nothing. So, I pulled it apart and twisted the gear manually. I think it was stuck. After I moved it, I added 12v and the thing took off. It went back together just fine and I tried to pump fuel through it while out of the car. No go. Fuel didn't suck out of the bucket like I was expecting. So, I figured that maybe it needed to be 'primed'. I put it back on the gas tank and held the other e…
Last reply by Mike, -
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Hi. I'm from Montreal, CND, and on my way to buy a nice 240Z 72. The car has 93 000 miles and need a valve seal job this spring (car is actually stored). I'd like to know what is the interval to change or do maintenance on the timing chain since i did not find any info in the Haynes manual... Thanks for your help!
Last reply by guy_geo,
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