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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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deceleration while accelerating?

August 1, 2004 by deadflo
9 replies

1.4k views
Any ideas on why i get a breif deceleration while accelerating either at part or full throttle? It is an intermitent problem for sure. It can happen when applying throttle at any RPM, you give her gas, say at 3500, she will accelerato to maybe 4200, then fall back to 4000 for a second then pick up again,. Otherwise the engine is running very smooth, no jerky action during these episodes. Does it sound like a timing advance problem? its not just the tach malfunctioning, I can hear the enigine fall off in revs for a few seconds, but again it is internmitent. This is in my 71 with stock carbs, only mod is header and exhaust.

Last reply by MikeW, August 2, 2004
Pressure

August 1, 2004 by suleymantezgul
0 replies

986 views
Can anyone tell me the minimum required engine pressure reading in psi or kg/CM2 I should have for 240Z 1971 ? I know the compression ratio,but I need the gage reading to check the performance of each cylinder.

Last reply by suleymantezgul, August 1, 2004
Flat Tappet Cams

July 31, 2004 by Zrush
2 replies

1.2k views
I was reading an article about how NASCAR needs to update a few things in their cars. One article was how NASCAR continues to use carburetors but virtually no cars built today utilize carburetors. The other article was in reference to cams. It stated that they continue to use "Old Style Flat Tappet Cams" which are neither as efficient nor as durable as roller cams. Much of the cam failure that drivers experience would be eliminated with roller cams. Our Z's have roller cams, correct? Can someone explain to me what a "Tappet Cam" is. Vicky

Last reply by LanceM, July 31, 2004
oil pan reinstallation

July 27, 2004 by broken74
10 replies

1.7k views
hey guys, I seem to have a leak coming from my oil pan so i have purchased a new oil pan gasket. My car sat in a warehouse for about four years and i cant seem to get my oil to stay clean either even after using motor flush so i'm guessing i have gunk on the bottom of the oil pan. As long as i tighten the bolts in a cross pattern, installation of the pan and gasket shouldn't be a big deal right? I was recently warned to be careful because i could warp the pan putting it back in if i dont torque it down right. How important are the specific torque specifications as long as i'm tightening in the cross pattern? thanks, brian

Last reply by broken74, July 29, 2004
building my engine (ideas)

July 24, 2004 by e_racer1999
4 replies

1.1k views
**also posted in hybridz okay, i'm trying to find a really god combination for a street/autox car. i want decent power, but i don't need buttloads of torque. i have a 1972 240z (all stock) with the E88 head. i have a complete N47 L28 (1979) and i already have some ideas. i wanna know what you think! okay, i'm taking the 5 speed and i'm keeping the R180 (LSD comes later) and putting 4.11 gears in it (good idea?). i plan on getting flattop or slightly domed pistons and using the crank and rods from the L24 (i know you think this is going in the wrong direction, but i want revs!). will the L24 rods be good enough? I also want to know which head i should use (E88 or N47). i…

Last reply by e_racer1999, July 28, 2004
I think i found my problem! 1 2

July 5, 2004 by Datsun-Fever
15 replies

2.2k views
Hey guys, so a while ago i was asking about my engine, it felt and sounded like it wasnt getting enough fuel, and it kept choking out and dieing. Well i looked at the fuel filter and sure enough, their are two collapsed and kinked areas in the rubber hoses, so it was cutting off alot of fuel. Anyone else have this problem? i want to make a new metal fuel line in that area, any advice? thanks. -Fixed

Last reply by 1971rb26dett, July 28, 2004
89mm pistons FOR A L28..From wot motor?

July 8, 2004 by datfreak
5 replies

3.2k views
hi all, I was planning on doing the ld28 crank and 89mm piston thing BUT i think i'll go the lamer standard stroke way. I am hoping on keeping the std l28 crank and fitting some 89mm (120 thou over) pistons that should give 3.0l. Does anyone know if any standard 89mm pistons will fit, with correct piston height etc(even with diff rods)? The L series engine calc program is good but i still want more details before I go ahead.(like sussing out oversize head gaskets etc) Has anyone done this?

Last reply by kyleh, July 27, 2004
Crank shaft pulley,Euro Damper, INTERNAL BALANCE DAMPER ASSEMBLY

July 25, 2004 by jaynez31
3 replies

2.9k views
The crank shaft pulley is wobbling and hitting something which creating banging noise from the L28. So I have to replace the crank shaft pulley, altnater pulley, and the water pump pulley. What's is the "internal balance damper/harmonic balancer/Euro damper"? I read privious posts which suggest the crank shaft pulley and Harmonic balancer are same things. So if I buy a Euro Damper or Race damper from the NISMO or Super Damper(Harmonic balancer) from the ATI performance products, then I won't have to buy L-28 crank shaft pulley from NISMO or MSA? Please someone advice for this things. jaynez31

Last reply by Ben, July 26, 2004
Crankshaft weight?

July 24, 2004 by san_maru_zed
3 replies

1.3k views
Just wondering if anyone knows how much an L6 crankshaft weighs ? Cheers

Last reply by MikeW, July 24, 2004
engine l24 question

July 24, 2004 by wedgey
2 replies

1.3k views
good day everybody hi im from sydney australia what i would like to know can i fit 280zx pistons,rods.crank and the p42 head and efi from the 280zx motor into my l24 block the reason is in sydney if you increase the cc you need a engineers report and its a small hassle but i like the idea of having the l24 block with the p42 head and efi rob

Last reply by Dan Baldwin, July 24, 2004
Servo controller and Diaphragm

July 23, 2004 by Inf
0 replies

1.2k views
I've looked at a lot of engine compartments on this site (before the upgrade) and noticed a lot of people yanked the servo controller and servo diaphragm and plugged the holes on the balance tube. How's the drivability afterwards? My car is up on stands and waiting on some other work before I can fire it up, so I thought i'd get some opinions here in the meantime. I pulled all the other smog stuff(air pump gear). The hoses were in pretty rough shape and I wasn't about to spend good $ on replacements! No smog checks for my 72 here in TX. I still have the servo parts, just I'd need to get a vacuum tap with a 1/8" NPT base now since I already tapped the hole for my NPT plug…

Last reply by Inf, July 23, 2004
Engine heads how they flow

July 22, 2004 by Gav240z
3 replies

1.3k views
Well i thought i should write up about what I've been up to with my Z lately. Since the site has been down for a little. I was originally going to install a new camshaft and engine head ontop of the existing block. However after pulling it apart and discovering the lash pads weren't wearing quite right and the camshaft was a bit rough they had filed down the square parts on the cam you can use a shifter to turn it from. For what reason I don't know. I decided I'd pull my P90 engine head off and compare the two. Here is the part some might find interesting. I have 3 motors:- Motor 1(Specs) F54 Block , 72 E88 Head, N42 Valves, Port work, Mild Cam. Pretty sure flat tops…

Last reply by Z Kid, July 23, 2004