Engine & Drivetrain
Post messages here about engine mechanics, exhaust, intake, etc. Anything to do with the engine system as a whole.
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It appears that a lot of 240z are now running an 81-83zx transmission with 3.9 or 4.11 gearing. I was looking at doing this as well--until I came across the May 2008 Classic Motorsports article on their 240z drivetrain swap. They used a 81-83zx 5speed transmission with 3.54 gearing. There appears to be some advantages to this appoach: 1. It looks like a straight swap--it's an R180 (instead of R200), so you wouldn't need the Zx mustache bar, etc 2. Lighter weight differential I realize that the R200 is a stonger differential--I will be running a rebuilt/ lightly modified L24 motor. Is anybody on the Z boards running a 3.54 diff? Thanks..
Last reply by Rich1, -
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Good day everyone. Well, I seem to have blown the engine in my 240z roadcourse car. It was time for a rebuild anyway. What I am looking for is advise on pistons for the L24. I have a well ported Early E88 head and triple weber 45's. I want to keep the L24 so I stay in GT3. I just don't have cash to keep up with the GT2 guys I am wondering what is out there for high compression pistons. I don't want to break the bank, but I am willing to spend some money if it is worth it. I would like to keep the total cost of my rebuild under $3k. A second question that I have is... How strong is the L24 crank. With the stroke being so short, can the redline be safely increas…
Last reply by wondersparrow, -
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There's a guy locally selling a ported & polished N42 head with these cam specs: 495 lift with 290 duration I think it was 107 lobe seperation. Only pulled about 9 or 10 inches of vac. at 1000 rpm. Pulled like a bitch in heat after 3000 or so rpm. That head made 191HP to the wheels on a stock bore flat top bottom end with a header and standalone efi. What does this mean in laymans terms?
Last reply by texasz, -
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I just bought a 280z engine for my 240z. It's got fuel injection so i'm removing it for carbs. I know what I need to do to take it off, but i don't own an air compressor or tools for them. Is it needed? or am i able to get by with had tools. I've also taken off the clutch and flywheel to mount it onto the engine stand. I assume to get the clutch back on it might take a little extra torque. Any help would be great. Thanks.
Last reply by Tophu530, -
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when I first got my '73 the timing chain was stretched and compression was 160 PSI. I advanced the chain to #3 and it came up to 175 PSI. This winter I replaced the timing chain, and bent a valve in process. the 5 cylinders that were good showed 175 to 180 PSI. I then got a valve job to fix the bent valves- new exhaust guides, grind, new seals- AND the head needed to be milled. After the valve job, timing mark back on #1, compression is down to 155-160 PSI. The machinist didn't actually measure the amount he milled off ( :tapemouth), but he thought it was only a few thousands. Now I've heard/read that head/deck milling will retard the valve timing, but never any discussi…
Last reply by Mn_Z_Man, -
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Today the temperature gauge on my 240z is running slightly over half. I swapped out the valve cover yesterday for a polished one, but I don't see why that would have caused any problems. The engine is not leaking any oil whatsoever and it's not low on coolant. Nothing has changed except for the valve cover and I have no idea why the car is running hot. Any ideas??
Last reply by lm71z, -
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Has any one had any luck using Locktite to secure the diff. ring gear bolts? Bending the tabs over fatigues them and I'd like to come up with a method that allows me to change my Quaife in and out as necessary.
Last reply by ezzzzzzz, -
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I was driving my 280Z today and all of a sudden white smoke started poring from the vents on my hood, I pulled over and opened it to see what was the matter. Well, the tube that goes from the cap of the radiator to this plastic container which is located right behind the turn signal lights in the front, its cap had popped off the smoke was coming from that container. Now, Im not an expert on the engine so I'm assuming Im low on anti freaze? because there was a crap load of liquid splattered everywhere but I couldnt tell if it was green or not... All I know is that it came from that container. I put the cap back on the plastic container and started to drive again, but it k…
Last reply by FastWoman, -
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Pretty simple question. I have a 5-speed left over from my 510 project (I think thats what it's from)of a couple decades ago, will it bolt onto my 72' 240Z? If not I have it for trade or whatever. Thanks again for the help, Regular Joe:ermm:
Last reply by Bruce Palmer, -
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Graph of my L-28 dyno runs... power is at the wheels. I've seen some posts about 'how much horsepower should I have?' Perhaps my runs are a useful reference point given that my basic engine set up is a fairly common combination. Engine is: Stock L-28 (F54) with flat top pistons. (NA 280ZX short block) E-88 head with very little removed from head gasket surface - just to true... Intake port matched to stock intake manifold, very minor porting on exhaust ports. Manley stainless valves 1mm bigger intake (1.73'' I believe). Stock exhaust size. Stock valve guides. Stock cam, stock SU's (with SM needles), stock air cleaner, stock air filter Crane HI6 ignition Cliff…
Last reply by inline6, -
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i'm reading along in my engine rebuild book, and it says that i should paint my gasket with aluminum paint if it hasn't been already. i got my gasket from MSA, and it seems to not have any coating on it. is painting necessary with newer gaskets? what do yall think?
Last reply by Phred, -
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Ok I have a 73 240z with a l28 engine. As I recall the L28 dont have the fuel pump lob and I like to install the mechanical fuel pump. Is there a site I can go to to find that lob or is it even possible to have it? Also is it easy to put on... I like the mechanical fuel pump and the way its mounted thats why I like to put it on. Please please please help
Last reply by myfairlady,
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