Engine & Drivetrain
Post messages here about engine mechanics, exhaust, intake, etc. Anything to do with the engine system as a whole.
5,569 topics in this forum
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core plugs
by mekjus- 6 replies
- 2.3k views
hey guys, for a L26 block what would be the correct size freeze plugs , 35mm or 40mm, and does anyone know who sells long tube headers for a good price for the L26
Last reply by Nigel1943, -
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- 8 replies
- 2k views
I took my first stab at adjusting valve lash this weekend. I found that most of the valve's were about .002 too tight. Most of the exhaust were at .008 and most of the intake were at .006. I now have them adjusted to factory spec (.008 intake and .010 exhaust - cold). I still feel that something is "holding the car back" over 4,000 rpm's, and I'm curious what effect insufficient valve lash can have on performance? I did notice one other curious thing when I was taking out the plugs. The #4 plug was fouled, and all of the others were nice light brown, and clean. The valve lash at the #4 was just like the others, a little bit too tight. I've noticed this plug being f…
Last reply by Weasel73240Z, -
- 4 replies
- 2.6k views
i was just going to take the tranny to AAMCO but they wanted 460 JUST IN LABOR! so that wasn't happening. i was reading a thread earlier and i believe that zbane mentioned a "needle bearing" that needs replacing. anyone have a part number or know how to do it? my symptoms (like someone else on this forum) include loud whining in first and second. it's less in third and fifth, and nonexistant in 4th. also, i thought my throwout bearing was bad because my tranny had a kind of rattling sound when the clutch was ENGAGED (pedal not depressed). but from what i read in another thread, the throwout bearing is the exact opposite. anyway, help? part number? schematics? wanna come d…
Last reply by sblake01, -
- 7 replies
- 2.1k views
Guys, Just took my '77Z on it's first long trip (400+ miles) since I bought it 4 years ago, and outside of a little oil pressure fluctuation it ran fine. I started it up this morning, put it into reverse and started to back out of the garage when I heard a loud whine and what sounded like a metal-rubbing-on-metal sound. I shifted into 1st and pulled it back into the garage. The sound ended when I shut the engine off. I went out again a couple of hours later to check it out and see where the noise was coming from. I got the following: --I heard the noise only when the drive train was cold --even when cold it doesn't happen all the time --with the engine idling and …
Last reply by Arne, -
- 8 replies
- 2.7k views
This is an issue with my '71 with an '83 L28 and '83 5 spd installed. I had a combination of issues happen while on the track at Road America. First, I think the fuel regulator started to go bad. I lost power and died. Had to get flat towed in. While diagnosing the no fuel problem, I got the car running again. Then when I was revving the engine, I started to get a real severe vibration through the stick shift. There was also a bad noise coming from the back of the engine. I could not tell if it was coming from the engine, the tranny or the clutch. The only thing that I could think of that could have hurt something was that I messed up a down shift and it revved pre…
Last reply by Bcalvosa, -
Still smokin 1 2 3
by Sailor Bob- 30 replies
- 4.1k views
Guys, I am looking for advise. I just got the 240 running after a few changes in an attempt to get her ruuning better and cleaner - the car was running after a fashion when I got it, but nothing that would live up to the Z reputation. It had a set of very troubled looking four screw SUs that had loose throttles, dipsticks from a 260 and a sticking choke, just a good case for replacing. I got a set of Carbs from ZTherapy along with a stripped down balance tube, set them up according to the book, installed new plugs and wires (NGK) and blanked any unused hookups for pollution gear. Pulled the choke and turned the key - it gave me a little fright, it started so aggressive…
Last reply by Sailor Bob, -
- 1 reply
- 2.5k views
hi, i am thinking about swaping a 350 small block carburator engine into my 76 280z. what do i need to do and what modification do i have to make and how much will it cost me than just getting anothe 280z engine and have it put into the car
Last reply by bigoak, -
- 10 replies
- 2.3k views
Just thought I would update on my zeds progress. I decided to install the shifter bushings I had ordered almost a year ago. Well, what I learned is its FAR easier to do this from inside the car, than underneath. So for anybody who is looking to do this, its a piece of cake. I found out that I was missing some compression washers on top of my rubber bushings, and thats why my shifter was spinning. So I fabricated some and now my shifter not only feels more 'gated' but it no longer spins!!!!
Last reply by sblake01, -
- 3 replies
- 1.6k views
Not sure what it is called but it is the bar that sprays the rocker arms with oil. I need one as I noticed when adjusting my valves that one end was very loose and the middle bar pretty much spun freely. On a side note how much would this affect my oil pressure. If anyone has a spare please let me know how much or where I can get one. Thanks, Mike
Last reply by Diseazd, -
- 3 replies
- 1.4k views
Went to go see an early 71 240z today, did a compression test and got 1 179 2 168 3 163 4 170 5 167 Exhaust(?) valve was stuck open for the first couple tries (0 pressure). Took off the valve cover and popped the spring back on right and got the 167 reading 6 200 why so high?? The engine is a L28 N42 block and early E88 head with SU carbs, been sitting for 2 years and I had to test it cold because the car doesn't run (no fuel) ps. What can I do to solve the valve stickiness?
Last reply by vling, -
- 3 replies
- 1.7k views
Hey everyone, I set the timing on my 72 240z at 10 degrees BTDC at around 750-800 RPMs. When I look at the cap and rotor though, there is a black mark at the extreme end of the rotor(all the way ccw) and there are marks on the cap to the extreme ccw side too. Would this mean that my timing is off? The cap is getting sorta blackened so I am assuming there is a good spark. Nothing really seems out of place except that and its lacking in low end power. It might be missing a little bit? But it seems hard to tell. Should I try and change it a little? It seems like it I retard it it runs worse. I am getting the carbs tuned on the 7th so I guess we will see how that goes too.
Last reply by MikeW, -
- 7 replies
- 1.9k views
I need to know the length of the rear-most exaust manifold stud. It must be a good deal longer than the rest because it anchors the water tube that goes behind the block and the engine lift hook as well. The set I bought a couple of years ago are all the same size. (I bought them from Reddat go figure) Thanks All, H Houghton
Last reply by vercingetorix,
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