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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I am building a L28 for my 240 and want to keep my triple carb setup. What would be the best head to use with flat top pistons? The car will be a daily driver so I dont want an incredible amount of compression, but I have no problem with using premium gas. I also dont know of any differences in valve sizes or anything like that, so any info would be great.
Last reply by 2ManyZs, -
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After stripping my L28, it came to my attention that piston # 6 was severely pitted. The piston has been like this since I rebuilt the engine after picking it up in a "patrs" car I bought. I didn't bother replacing it due to $$$. This time, I decided to sand the pitting out of the piston and took off approximately 0.5mm..... I'm wondering whether I should get the rest of the pistons machined in order to suit. The reason I did this was to prevent detonation with the turbo. I realise that shaving the piston will have an affect on the compression, but it doesn't really concern me if I'm going to put the turbo back on. The thing that concerns me is if I decide to go back to …
Last reply by my_mad_z, -
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i am bringing this z back to life and i finally got my engine back together after getting the headwork done, this motor hasent been started for 3-5 years, anyways i got it to run somewhat but it keeps misifiring and backfiring thru the carbs after a couple seconds of running then will eventually die, i took off the smog pump and plugged everything off i dunno if that has anything to do with it but i think its my timing off? any help would be appreciated, thanks
Last reply by JEFF, -
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I have a cam that I'm trying to ID. It has the casting "E-30" on it. Any ideas?
Last reply by Britt Boyette, -
engine mods
by Rick- 0 replies
- 1.5k views
Can anybody tell me what mods I should make to my L240 motor to take me up a stage or two in engine horsepower. I am currently using the car for club sprints and hillclimbs. All suspension mods are complete and it handles exceptionally well. Unfortunately I get my arse kicked powering out of corners and down long straights. The motor was rebuilt before I got the car a few years ago using pretty much standard parts except for the addition of the N42 big valve head and a decent set of extractors. I fitted a two and a half inch street legal straight through exaust. Limited funds at the moment prevent me from taking the car to an engine tuner. I am quite capable of doing…
Last reply by Rick, -
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I hope this doesn't sound dumb (I'm just a girl, I don't know much about cars) but if I replaced the 4-speed transmission in my 240 with a 5-speed, would it still be fast on take-off? As it is I LOVE it, I take off and leave everybody like they are standing still. It has a lot of power (takes off easy from standstill in 2nd) and my ex-husband said that it had too much power and needed a 5-speed. (I think he was just mad because I always beat him and his 944 porsche in a quarter-mile.) I really don't want to change it, I am just curious as to what difference it would make because he was always wanting to put a 5-speed in it. I am going to start work on it after Christmas a…
Last reply by Royce, -
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I will be replacing my stock exhaust system on a '72 L24 from the y-pipe back with 2 1/4 inch pipe omitting the resonator. I have looked at past posts regarding new exhaust systems and this sounds like a good way to go. My question has to do with what muffler to buy. I think a turbo muffler is what I want. My choices are a Walker super turbo or a standard turbo. My goal is a nice growl but not obnoxiously loud. Is there a significant difference between these two mufflers other than the Walker's stainless steel interior and warrentee?
Last reply by Petezcar, -
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After acquiring a '71 240 last month, I just took it to in for a North Carolina inspection..it failed. The smog pump is not hooked up(no belt), and the pump cannot be turned by hand, so I guess its fried. Many comments here suggest the pump's removal, to boost power, but how do you suggest getting around the state inspections without the pump in working condition.
Last reply by 2ManyZs, -
- 2 replies
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I got an OEM windshield weatherstrip from a friend who sold his 260Z 2+2. Does this also suit my '72 240Z ? I'm confused because MSA has 2 different parts# for the 2seater and the 2+2. Where is the difference?
Last reply by Doehring, -
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Well, I blew out a headgasket today, so I need to change it this upcomming weekend. The car still runs, but leaks water out of the right side between the head and block. How hard is it pull off? Can I just leave all the intake attached? How do I need to line up the timeing chain? I'v never pulled a head on these engines so I don't know. Thanks
Last reply by SMW, -
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Hello...When i first got my car i thought wow this thing can go when u want it to...but now it's two three weeks after that point and i have only gotten it to top out at 115mph...That is pretty damn quick for a me, and my first car and when i take my friends for a ride cause they love the car, they are like WoW this thing GOES...But i was wondering what can i do to get more power...I don't know anything about different heads and what they do or camshafts and blah blah balh....all the stuff wich seems pretty advanced..so my 240Z is completely stock...dual su's...peopel keep sayin that if i put some tripple carbs on there i will be gettin more but is it worth it if i am gon…
Last reply by Dan Baldwin, -
- 13 replies
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Well boys, I've always wanted to try the electric cooling fan sold by Motorsport. $130 something. Installed this week, and it is a dandy. Bolts up easy enough, car runs quieter, and most importantly, stays cool! It was mid 90's today and stuck in traffic, I swear it runs substantially cooler. Just have to get used to it running for a few minutes after shutdown. It's in a plain jane factory stock 73 240 w/72 carbs and 3 row core. I'm glad enough just to be rid of that fan clutch. Anyway, if you've thought about it, go ahead and try it. It works.
Last reply by jcdozier,
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