Engine & Drivetrain
Post messages here about engine mechanics, exhaust, intake, etc. Anything to do with the engine system as a whole.
5,574 topics in this forum
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- 10 replies
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Hi there, With respect to the L 24--> L28 engine, if the exhaust system is set up as two separate pipes from headers (3 into 1, times 2) to outlets,does this pose any tuning issues? The induction is 3 x2 choke dcoe sidedraughts. The reason I ask is any factory system I've seen with twin exhausts seem to incorporate a single(common to both pipes) muffler somewhere. Anybody got any technical experience of this setup? or can advise on what I should be considering? Thanks guys! Jim.
Last reply by g72s20, -
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After rebuilding the head the engine runs great. However I keep geting this backfire when I back off on the accelerator. It looks like the anti bacckfire valve is pumping air properly.
Last reply by Al Squillante, -
- 14 replies
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'81 F54 L28 rebuilt 3000miles ago with new bearings/rings Also has MSA cast Al oil pan with 7qt capacity L28 oil pump fitted with stiffer comp springs Changed the oil friday morning before I set out on my 1200mile weekend up to Monterey, then San Francisco, then ..., etc returning back to LA last night On the drive up no problems of course Last night somewhere in the middle of the valley on the I5 cruising at a steady 4000rpm in fifth (roughly 80-90mph) i notice that my factory oil press gauge which reads usually somewhere between 45-55psi (ie the needle over the "L" of OIL) is actually hovering over the "O" so I am guessing that puts it at a pressure of roughly 25-30psi …
Last reply by EricB, -
- 4 replies
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I put a lumpier cam in over the weekend and noticed that at high RPM it seems to starve for fuel a little, my local Motorsport shop told me i need to replace my main jets and maybe air correction jets to get the most out of it. At a high $$ might i add. So i stumbled on this forum, should save myself some cash hopfully. Im running Triple 45mm webers (im not that technical so please excuse me if i dont have all the tech details, assume they are standard i guess). 32mm Venturis so i guess i have..130 Main Jets and 180 air correctors (roughly) 272 cam with 318 (cam only) duration L28 with flattops (2.9) Ported and Polished P90 2.5 Exhaust If anyone could give me a rough idea…
Last reply by redneckz II, -
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yeah just curious to know if anyone had a good guess on hp loss on a 280z with 90,130,130,130,130,105 compression? and also does bad compression cause worse gas mileage?
Last reply by 280zgod, -
- 10 replies
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I own a 1981 280ZX, Fuel Injected, Datsun. I was cleaning out the engine compartment and checking connections, when I found a about 6 to 7 inch diameter canister directly behind the passenger side headlight with several rubber hoses attached to it. Looking inside my mechanic's manual I discovered that it is a carbon filter, that is supposed to prevent vapor lock by trapping hydrocarbons in it. I have never seen a filter or canister like this on any other vehicle. Does anyone know if I can remove it and will it affect engine performance or relability? It also has yellow filter at the bottom of the canister. Being 20 years old the yellow filter is disinagrating. Can I buy a…
Last reply by TomoHawk, -
- 5 replies
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Here's a new one to me: an engine power balance test. Has anyone else heard of this? This test was performed by the people who recently tuned and ajusted the carbs on my L24. When I questioned them more closely, they told me that the test is a truer assesment of the performance of each cyclinder than a straight compression test. Here's what they do: The engine is connected to electrical diagnostic equipment which allow the rpm to be accurately measured. With the engine warm and at idle, one plug lead at a time is disconected and the drop in rpm is measured as a % of the idle rpm. So, if my engine idles at 750rpm and the power balance test records a '10' when the cylind…
Last reply by beandip, -
- 9 replies
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hi, i have a 240z 73, i done have the 73 engine because it dosent have that smog stuff, si its has to be a 72 engine because its the e88 head. in zhome the 240z that have 151 hp at 5600, while th eothers at that have 150 have it all 6000. how do i know if mine is 5600 or 6000? i cant find the specs for a 72 engine. thx for the help
Last reply by Bambikiller240, -
I got a 73 240z auto that I'm converting to a 5 spd. I got a flywheel from another 240z, don't remember year. The problem I'm having is the flywheel won't fit onto my 240z engine. I don't know the exact name of the part it bolts onto but i'llt ry to explain it best as I can. Coming out of the crankshaft, there's that round piece that sticks out a little and that the flywheel is suppose to fit into and bolts onto. Heres my problem, is the round piece that its suppose to bolt onto, is too big to fit the flywheel. Friend of mine called the MSA tech line and asked them about it. They said the crankshaft was different on some of the earlier cars and that the only thing I co…
Last reply by Bambikiller240, -
- 7 replies
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Hey guys, for fuel injected l28's, how long does it take for you to hear your fuel pump running? mine runs after i turn the key, i just wanted to know if thats normal, because a guy looking at my car said thats not right. -Thanks
Last reply by Datsun-Fever, -
First tuneup
by halz- 11 replies
- 2.3k views
So I've had my Z for about 9 months now and in that time I've concentrated on fixing the major problems (radiator, bent wheel, oil leaks, crappy interior...) but last week it was time for the engine to get some attention. I took it to my local auto-shop and asked them to check the carbs, ignition and compression... Well it looks like I got lucky. The owner of the workshop loves older cars and is a fan of SU carbs! He balanced the carbs (they were way out) and topped up the dashpot oil (empty on both). He adjusted the dwell and advance of the distributor (again way out). He checked the compression (185, 195, 190 190 190,195psi) for my L24 with E31 head which is excellent. …
Last reply by Bambikiller240, -
- 6 replies
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What sort of compression would you want on a turbo motor to allow it to take less than optimal (say, 89 octane) pump gas? If you wanted to build a 3.1 stroker turbo, what choice of parts would you go for? Most of the 3.1 builds seem to have a fairly high (9.5+) compression ratio, which doesn't seem to be a good idea for a forced induction motor. I would definitly like to keep an L6 core in the car, and have toyed with the idea of building a 3.1, but they all seem to be normally aspirated. Why not go the full route, and drain every last bit out of the engine that is possible (without putting a bomb in the front of the car!)? I don't have any problem with Nissan parts fr…
Last reply by sblake01,
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