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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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suddenly running really lean

January 21, 2003 by dero
0 replies

1.3k views
for some reason im not getting enough fuel pressure to rev the car as it should rev, yesterday my car ran good and today its running so lean to where itll barely run, im hoping its just a fuel filter possibly? do 240z fuel pumps just die out like this? i put the motor back together and cleaned up the fuel pump and it had a good vaccum, im gonna buy a new fuel filter tommorow but i just wanted to hear someone elses opinon, thanks.

Last reply by dero, January 21, 2003
carb and throttle questions

January 19, 2003 by cardogman1
3 replies

1.2k views
I don't know if this is the correct forum to ask these questions but here goes. Someone just told me that the pictured diagram on the top of the air filter cannister is wrong at least on the 71 Z. The actual Idle adjustment is the larger screw on top of the throttle linkage and the two screws one on each su are airblead screws. Those ar the two screws I believe that are closest to the Carbs. The larger screw on top is labeled fast idle adjustment. The next question is this. The idle doesn't seem to want to come down at a stop. It conyinues up there at around 1500-2000 rpms. Is this due to the valve or some vaccum hose near the front carb. Initially I thought it was a st…

Last reply by cardogman1, January 20, 2003
mistreating an engine and shoot oil out the dipstick?

January 17, 2003 by PHSHARKEY
1 reply

1.3k views
Has anyone ever heard of mistreating an engine (e.g. up over redline) and shooting the oil out the dipstick holder? Thanks,

Last reply by 2ManyZs, January 17, 2003
Gasket set for an L20?

January 13, 2003 by Bleach
6 replies

2k views
I want to put a fresh engine gasket set on my L20b in a 1970 Fairlady Z. I know the bore is smaller, but how about the block height? If it is the same height as the L24 then I should be ok on the front cover gasket. Anyone with an L20 engine ever put new gaskets on? Is there actually an L20 gasket set available?

Last reply by Bleach, January 14, 2003
did i bend a valve? and why is this happening? 1 2

January 6, 2003 by clutchdust
19 replies

2.9k views
i'm still working on my friends '72. i finally got it running the other day. i did a C/R check because #6 seemed to be weak and found the valve adjustments were all scattered to hell. i readjusted the valves per my haynes manual: .008"/intake and .010"/exhaust, cold as measured between the cam lobe and rocker. this is the way i read it in the book. the problem i'm experiencing now is that i continue to have rocker arms jumping out of the valve guide (what do you call that little cup with rails the rocker rides on?). so after i adjusted the valves intially last week, i got it running and it sounded pretty good. i had to move it and it sat for a week over christmas w…

Last reply by Zedrally, January 14, 2003
Which Oil? 1 2

September 12, 2002 by Ed
17 replies

3k views
How do you decide what viscosity of oil to use? I'm talking about 10-30 vs 20-50. We know that new engines have closer tolerances in the bearings requiring thinner oil ie.. 5-30 or 10-30. But at what point would you use a thicker oil, 0.001-0.002 or more? Lets assume we are operating at moderate temperatures and driving around town.

Last reply by CoastGuardZ, January 13, 2003
Need rocker arms- Engine rebuild help

January 10, 2003 by That Ozzy Guy
1 reply

1.3k views
Where can I find these in Australia or where can I order them from o/seas for my '72 240Z? The guy that's doing my engine reco has found everything bar the rockers. With a higher duration cam, are the rockers different? ie should I first set my mind on a cam and then buy the appropriate rockers or what? :stupid: Another option he told me was to swap the head with that of a 260/280? Is this the better option considering I want more perfomance out of the car? I'm planning to use 27/70 cams or should I go with the slightly milder 25/65? I don't want to loose out on too much bottom end power. What other options do I have with heads and/or cams? Sorry about all the questions…

Last reply by Ben, January 10, 2003
4 speed trans from a 280?

January 9, 2003 by tttz
2 replies

1.1k views
The previous owner of my 71 Z put a four speed transmission back into it and i assumed it was from an early z car. Then i noticed the other day that someone wrote "77 280Z" on the transmission. i'm not sure of the name of the part is that it was written on it, but i could see it from looking down into the engine bay standing on the driver's side. So my questions are, how can i tell where the transmission came from? Did 280's come in 4 speed? perhaps i wasn't even looking at the transmission in the first place! i don't know much about cars, but i love learning about them. Thanks, Ty

Last reply by tttz, January 10, 2003
Exhaust FYI

January 9, 2003 by Zsled
5 replies

1.4k views
So today I completed the install of a new exhaust system on my 72' 240z. It has the stock L24 with no mods. I swapped a motorsport auto header out of my 75' 280 into this car. It is the 6 to 1 style header. So here it goes... I have a header, out to a 2.25 inch pipe with about 10 inches to a Glass pack (Bullet Muffler). From this muffler it does 2 bends to a Turbo Tip! This is actually a twin tip that has been filled with glass. This whole set up from the header to the tip cost me $80 USD. The header and Tip I had, So the collector and the bullet muffler with the tubing made up the rest of the $$$. I am writing this to let you know that I have almost no loud res. in the…

Last reply by ZmeFly, January 10, 2003
air bubbles coming out of fuel line??

January 6, 2003 by Sonic
3 replies

2k views
I have had this problem since i bought my 73, 240z. When I have the engine running i can see tiny bubbles coming out of the base of my clear stock fuel filter. Under a load, the fuel level will fall below the filter 'sump' and the pump will suck air. I have replaced all of the rubber lines, filters, fuel pump, and checked the lines for damage. Still not resolved! The only way I keep my car from dying going up hills or when under load for long periods, is a temparery electric pump. What could be causing this?

Last reply by Sonic, January 7, 2003
A rare find in NZ..Alan I need your help

December 18, 2002 by 240znz
7 replies

2k views
Driving along taking my son to Kindergarten I turned into a quiet street and caught a glimpse of a 240 roof line over a small fence. You know how sometimes you look around when your driving and something catches your eye...this is one of those times. This happened a week ago and I and after a 240 now I'm back in NZ and I went back for a real look today. Someone was at home so I walk in and chat to him. It is a 1977 240 body with a L20 injected motor with AC and 5 speed. Alan....do you know if this was a factory setup in 77 of is this a back yard beast? FairladyZ badges on rear and side of front guards ONLY. In red with iron cross wheels. It is in very bad rust mode with c…

Last reply by Ivan, January 5, 2003
Flat top compression

January 2, 2003 by ctomkins
0 replies

1.4k views
Does anyone know what the maximum compression a L28 .040 over, cast, flat top piston can handle before it implodes. Running on roughly 105 octane.

Last reply by ctomkins, January 2, 2003