Engine & Drivetrain
Post messages here about engine mechanics, exhaust, intake, etc. Anything to do with the engine system as a whole.
5,555 topics in this forum
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I have a 1973 240z with a bob sharp holley carb. setup, also with a mallory duel point distributor. When i started the car up for the first time since i cleaned it up it wouldn't start. I am getting spark and since there was a loud pop out the tail pipe im guessing im getting compression. Also since some fuel spraid out the carb. We played with the timing a lot. But what gets me is that the distributor is turned opposite of the stock unit. It worked for my dad years ago with the same setup. Is their anything that i might be missing? I would like to get this puppy started Thanks, Patrick
Last reply by slickseventeen, -
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Looking down from top, which way do I turn the big knarled nut at the bootom to lean out the carbs?
Last reply by 240ZX, -
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I've noticed some wierd idling behavior lately in my 240. If I start the car, let it get fully warmed up, let out the choke, and let the car idle, it idles right where it sohuld - 700-750 rpm. Bit after I drive the car, then idle, it idles at 1100 or so - it won't go any lower than 1000. Can someone explain why this is happening? Is it a problem? Should I adjust my idle speed based on idling after driving? The carbs could probably use a tune, but even as is, the car runs VERY well. One other thing that has concerned me since I bought the car was gas consumption - I average 15mpg. Thoughts and help are always appreciated.
Last reply by Marty Rogan, -
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Got some new exhaust on my Z. I'm sure most of you now know what I'm packing from all my posts while building her last year. But for those who dont... 1973 240Z, rebuilt '81 L28 F54 block, P79 head, headers, electronic ignition, 6-1 headers, '70 SU carbs from Z therapy -w- original air box (K&N), '81 5-speed, '81 R200, strut bars front and back, polyurethane soon to be installed. Anycase I got some new exhaust, called twice pipes, from Motorsports this weekend and had a local shop (for those of you in Tulsa, Leons in Sapulpa does GREAT work!) install it. Basically from the collector on the headers it splits into two 1 3/4" piper all the way back to two glass packs. W…
Last reply by peterpit, -
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I've been reading/hearing about some confusion many home engine builders are having concerning camshaft timing-duration numbers. Such as,"my 300 degree cam dosn't have as much lift as my buddies 280 degree cam, and his seems to make more power. Whats up?" First, understand there are two different methods cam duration is measured. One is the absolute, or advertised duration. The distance in degrees measured from a point where the lobe physically starts to rise from the base circle, to another point where the lobe blends back into the base circle. The second is a standard "checking height" of .050 lifter rise, or in the case of the L series engines, valve lift. Naturally,…
Last reply by Phred, -
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I believe there was a post addressing something about this before, but I was wondering if someone could just clarify for me. The L24 puts out about 150 hp, and the L26 puts out about 139 hp? The 240z tech webpage has an engine spec section where they list the L26 as having 162 or so hp. Is that the engines potential base hp? As in with all the smog pump things removed? I've been told the emission laws cracked down on the 260z's at the time, so would an L26 be close to that 162 hp figure if I used SU carbs from a 71 240z? I've got a L26 I was thinking about restoring, so when I saw 162 hp I thought that might be a sweet deal, but I've also seen that lesser 139 figure…
Last reply by Ben, -
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It's possible that my linkage for my SU's are a bit gunked, causing me idle problems. Cleaning the linkage should be an easy enough affair, and I always say (in reference to working on cars) try the easiest solutions first. What should I use to clean the linkage? Is there some kind of spray I can buy or do I have to actually do it by hand? Also, what's the best lubricant for after I clean it?
Last reply by 2ManyZs, -
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I just down loaded the L6 engine calculator and now my head is abuzz with questions. Playing around with this usefull program i noticed how easy it is to raise the compression ratios of my L24. For instance swapping my E88 head for a E31, or replacing the crank with a later model unit. My question is how much compression can you run and still use regular pump gas. Also does more compression necessarily mean more horse power. My qustions are really just academic since this is all part of the learning process. Fear not i'm not going to go out and build an engine that will blow me the car and my neigherhood up:D Building engines is beyond my humble skills right now but i do…
Last reply by 2ManyZs, -
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Ok, will that fit custom on my Z? I have a used deal with a used 280Z rad, fan and clutch for 30$us... Cheaper than doing the total restoration. What about the water pump now??? is it a good move?
Last reply by guy_geo, -
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I want to replace the entire exhaust sytem on my stock engine 72 240. The current setup is aftermarket and doesn't even fit the car. The things I am looking to achieve with a new exhaust system are more horespower and a better sound - not too quiet, not too loud, but sounds like it's got some muscle. As far as price goes, I don't want to go crazy, but I don't want to go cheap either. So given that and given that I'm car illiterate, my questions to you are: 1) Should I use headers? 2) What is the desired configuration behind the headers/manifold? 3) What type of muffler should I use? Should I add glass packs? 4) Should I go stainless steel? 5) Where can I go for …
Last reply by BILL COFFEY, -
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I am contemplating buying a 260z 2+2. I really like the style of the car and all zeds for a that matter, but i think it would be much better with fuel injection. I was thinking of using the existing carb manifold, and fitting two small throttle bodies in place of the carbs and fitting bosses for the injectors. And then using either a 280xz or skyline computer. Has anyone done this? i know of a guy who did it with at 280zx manifold, but i think twin throttle body would be more responsive. any comments?
Last reply by Rob, -
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I've been thinking about a triple carb set up and was wondering what things should be considered before installing such a set up. Currently my 72 has the stock L24 with a few mods i put on such as msa 6 into 2 headers, ZTherepy SU carbs with air horns and filters, a 2.5 exhaust, and a crane electronic igniton. I also took off all the smog stuff like the air pump and air galley. I invested the money for the ZTherepy carbs so this is not something that's going to happen right away but i know there are members with experience with triple carbs and i'd appreciate their input. Should i dump the L24 before i really get serious with triple carbs, or can good hp be found in this …
Last reply by 2ManyZs,
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