Engine & Drivetrain
Post messages here about engine mechanics, exhaust, intake, etc. Anything to do with the engine system as a whole.
5,568 topics in this forum
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Well I recieved and installed the 30mm chokes for my webers today. Boy howdy did that do the trick. I still ahve some tunning to do but the car pulls very hard right thru 6000 and keeps pulling hard well beyond. I have not pushed it to 7000 yet but close, I am sure it will go there if asked. I think I know why the small chokes were in there now. When I spoke to Mike at pierce manifolds, he said that if I had the webers with two progression holes there would be a flat spot when taking off as the throttles left the last hole. I never noticed this with the 26mm chokes. It is not a real problem but i noticed it tonight. Come to think of it my last set of webers had it too. We…
Last reply by smg1404, -
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- 2 replies
- 2.6k views
what is the best head combination to run on a stock L28 with 72 Su's? is the N47 going to give me better emissions due to the exhaust liners or would the E88 be a better combination?
Last reply by St.stephen, -
- 1 reply
- 1.3k views
I just bought my first Z and I have a problem that I can't figure out. When I am idling and rev the engine the throttle fluctuates normally but it's in gear and lets say around 3500 rpms and I pop the cluch in the rpms stay a 3500 and will not drop down in till I shift into the next gear up. So I cleaned the carbs and lubed the throttle return spring and they feel ok. So I am wondering if any body thinks that the clutch is not fully disigageing and also happens to be worn just right that I am actually speed shifting. Thanks for your help. Madsoul
Last reply by 2ManyZs, -
- 28 replies
- 7.4k views
I'm considering replacing the stock air filter system on my 240 with a K&N system. I realize that without a lot of other work in the engine compartment (mine is all stock), I'm not going to see a huge gain in performance. Do you guys think it's worth it?
Last reply by smg1404, -
- 3 replies
- 1.8k views
Hey guys, Should the valve cover breather hose have pressure or vaccuum? I have vaccuum on mine ( 72' 240 ) I was under the empression that it would have a small amount of pressure out. The hose that connects the block to the pcv on the balance tube sucks vapor from the crankcase -- is this where the vaccuum in the valve cover is from??:cross-eye
Last reply by Royce, -
- 3 replies
- 1.5k views
On the front driver's side in front & below the 1st exhaust port, the tube that sticks out from the block....... Where does or what does that connect to ??? I have seprate air cleaners and I think it connects to the carb. balance tube, am i right ??? Why?? thanks for any input
Last reply by Ed, -
- 10 replies
- 1.9k views
Hi all- Building up a L28 for my '72. It's an N42 block and head, +1mm overbore with flattops. The head has gotten some mild porting, chamber polishing, and portmatching. I cc'd the head yesterday, and got chambers from 44 to 45.3cc. Obviously, they need to be 'adjusted':stupid: But that then led to calculating the compression... with 45 cc chambers, 89mm bore, 79mm stroke, +.5mm deck height, and 7.6cc headgasket, I'm getting 10.93:1 CR. Ouch. My initial plans expected the engine to wind up with 10.5 using as-cast parts. That didn't count on the piston sticking up above the block deck... Now that it appears I need to relieve the chambers, I want to get down to…
Last reply by JEFF, -
- 2 replies
- 1.2k views
Ok so this is probably no big deal for all of you seasoned mechanics out ther but it is for me! I finally pulled my engine this weekend - it was my first time to pull one and I didn't have any help from someone who knew how to do it (except for lots of advice from 240Z.org buddies). Since my car was totally stripped I had to roll it around on a set of dollies I'd built. When I finished I found that one dolly was enough for the car so the other now is a transmission cart. The engine is safely up on an engine stand so I can find that nasty leak I've got. I'm almost ready to send the rusted out chassis to a scrapper - after pulling a few more things. Here are a few pic…
Last reply by mperdue, -
- 2 replies
- 1.5k views
I am going to be building a high performance over-stock engine for my 240z. The donor engine will be from an 81 280zx. Its a flat top piston motor, with a P79 head. My current engine has dished pistons and the E88 head. I'm wanting to stay as cheap as possible on my engine here, so I was wanting to work with what I have got. I want a high compression, good flowing, best head I can get. I have access to do all the shaveing, valve jobs, and porting work myself. What Head should I use? What will give me the best performance? I was thinking E31, but I see that it doesn't flow the best, valves are small, although it has the best compression ratio. Can it be fitted with larger …
Last reply by Seanh, -
- 10 replies
- 2.3k views
Hi Guys, I'm new... After a bit of advice, I've tracked down a fully restored and modified 240z, it has appeared in magazines over here in oz, and the owner will be selling in about a month... he's asking about $18,000 aud (about half in us dollars $9,000)... the following is a list of his modifcations (written by the owner) and a picture, just wondering if any of you have used a button clutch, if so, what are they like to drive?... "...I bought the car three years ago already restored for $12,000. The engine and gearbox had problems, however, so I decided to do an engine conversion. I had the 1JZ-GTE twin turbo engine fitted by Rocco's Performance. It has polished pipewo…
Last reply by Doco, -
- 11 replies
- 1.9k views
I am a day or so away from getting a 1974 Datsun 240zx. A friend of mine told me about it, but I haven't really looked at it yet, just drove by it. I'm getting it for $300 so I don't expect much, but he says its in really great condition actually and the guy just needs to get rid of it soon. It has a straight-6, 4spd trans he told me. I am wondering what all I can do to it. I want to fix up the body and interior all stock, but the engine/trans is going to be modded. I used to own an 81 280zx, but it was just a stipped down junker that I never drove, parts car pretty much. I sold it, and the guy who bought it got it running and said it ran a 15.4 1/4 mile, and showed me th…
Last reply by St.stephen, -
- 9 replies
- 6.7k views
Does anyone know why this is happening, and why it is only happening to 1 or 2 tubes and not all of them? BTW it's a MSA 6-into-1 equal-length-tubes header
Last reply by carguyinok,
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