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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So most of the regulars on the forum know I rebuilt an L-28 last year. With all sort of reasons for delaying the install I’m now about ready to do this. I wanted to start a thread to help lead me though any unknowns or challenges I’m bound to face on this next big task. To get everyone up to speed, the current engine has all sorts of problems that pushed me to just do a rebuild with a ZX motor I got at a salvage yard. Here are the bigs three items wrong with the current engine. 1. Rusted Core Plugs, so rusted that coolant leaked pretty bad. I had a temp fix of filling the rusted out holes with JB weld. It’s actually held. 2. Serious timing changing slap (needs …
Last reply by Av8ferg, -
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- 480 replies
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I have been fighting this for over a year, and now I must surrender to the Z Gods on this board. I am at a loss of what to do next. What I am running? 1971 240Z with 71000 miles. Stock engine with MSA header and 2.5" exhaust Z therapy rebuilt carbs (about 1000 miles ago installed), ran great when bolted up Advance distributors Rebuild OEM dizzy recurved to Eurpoean specs (static timing at idle 13 Deg BTDC, at 3000 rpm I am 32 deg BTDC) I do run a vacuum advance on top of that. New NGK resistor style plugs, but car had problem with new NGK non resistor plugs New Pertonix installed in dizzy, and new flamethrower coil. I have rebalanced the carbs and I am currently almost a…
Last reply by Captain Obvious, -
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I bought a f54/P79 zx motor about a year ago. Paid 200$ for a motor that came from a running car that had 110K miles-DEAL! I was just wanting a L28 block with flat tops so I could put my e88 head on when I was done messing with my L24. The bores looked great and it all cleaned up well. Had the block tanked and a ball hone on the cylinders. They magnafluxed the block and measured out the bores for me to check specs, all was good. 120$ At this time, I wasn't planning on using the P79, so I sold it off for 150$ Since my L24 project is going so badly, I thought I might try and work the L28 at the same time and use whatever engine is done first. But was headless. Alway…
Last reply by 240z70, -
- 277 replies
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My great rally adventure in my Z would not be complete without a healthy dose of drivable HP. When I decided to rebuild my engine, I had originally planned on doing it myself. I have build up many engines, but none of the 'L' variety. I had vast experience with V8's, but the L was a bit different. And there were some finesse items I had read about in all the rebuild books. I called around and not many people had experience near me in doing high quality L series head work and I just did not want to trust my original L24 to anybody. So I took this opportunity to call around and find out who was who when it came to rebuilding L series engines. I started with Rebello …
Last reply by Diseazd, -
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I placed the order for a Rebello 3.0 so at some point a mostly complete motor will be brought home to swap into my running car. I have done motor swaps on other vehicles but I am not a professional mechanic, what could I be forgetting? Heres my current list in no particular order: Have gaskets on hand for valve cover, water pump, intake/exhaust Lots of engine brite for cleaning empty engine bay and transmission label wires and tubes fluids for new motor clutch? oil change for manual transmission repaint engine bay replace battery tray New fuel lines Beer, bbq and weekend with friends I have left off the plug wires, cap/rotor, belt and water hoses because they have alr…
Last reply by Kurbycar32, -
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Started last night. Split second misfiring while cruising. This happened weeks ago and gas treatment eliminated it it seems. Could you point me where to start looking? I seem to be getting old for this . Thanks 12/70 2.6 block E88 heads Mallory DCOE40 3/2 Twice pipes Tokico 1, 3/4 in sways, ext oil cooler
Last reply by AK260, -
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So I'm out driving around today, just minding my own business... All of a sudden, out of the blue, it starts running exceptionally poorly. Somehow (still not sure how), I managed to limp it about five miles home. Get home and start the troubleshooting. It's completely missing on the rear three cylinders and front firing out the intake like the timing is way off. So, what can cause a complete miss on the rear three cylinders and run like turds on the others? ECU? Nope. That's not it. Dropping resistor? Nope, not it either. Bunch of lash pads fly out? Nope. "When you have eliminated the impossible, whatever remains, however improbable, must be the truth.…
Last reply by Captain Obvious, -
- 8 followers
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A while ago, I picked up an 83 ZX non-turbo and (with my recent calamity with my Z motor*), I've been working on pulling the motor with the intention of moving over into my 1977 Z. It's a stock F54/P79 combo and I'm not going to do a big time rebuild at this time, but I do want to do some clean-up and maybe some easy low hanging fruit improvements. I'm no engine expert and I'm going to have some questions for the collective along the way. I think there was a slight head gasket issue with the engine, so one of the things I wanted to do was replace that. Here's where I am right now. Head is off and block is stripped ready to be pulled from the donor car: So my fir…
Last reply by Captain Obvious, -
- 12 followers
- 210 replies
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I'm in the process of rebuilding a one, maybe two, or three, not sure, FC5W71B transmissions. It's just about the LAST thing I have yet to do on (to?) a Datsun. Always thought it was too hard and needed too many special tools. It's not. I want to record details of what I found and did along the process, but not in the usual way. -I will NOT take a video of the whole process. There are plenty great ones on YouTube. I WILL record the URL's of any helpful video's I find to help centralize the source for those videos and maybe critique each one's strengths. -I will NOT add the 300 photos I will take along the way. I WILL take photos and add notes on the…
Last reply by Matthew Abate, -
- 1 follower
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I'm building a new engine. I'll use the L28 N42 block bored .040 over with an L24 crank and rods, L28 P79 flat-top pistons and a high quench P79 head shaved and shimmed .080 inches (should be 9.2 to 1 C/R). What this will be is a very over-bored L24 because I really like the higher revving L24's and bigger is always better.....right? Anyone build this motor before or heard of anyone else building it? I'll update as I build on.
Last reply by Patcon, -
- 16 followers
- 209 replies
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Eiji buttoning up the bottom end of my stroker 3.1.....he really pays attention to detail. Can't wait to dyno this new puppy!
Last reply by Patcon, -
- 11 followers
- 167 replies
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I’m nearing the end of my veeery long rebuild project on my L24 and I finally bolted on my original F4W71A. I’m using the original throw out collar and fork, but installed this new clutch kit from zcarsource: link. When pressing on the slave cylinder side of the fork, I was just expecting to feel a nice gradual resistance as the TO bearing engaged the pressure plate. Unfortunately I feel absolutely nothing until almost the end of travel. I can’t imagine that small amount of travel is going to be able to get enough leverage to actually disengage the clutch. Any ideas what I could have done wrong? Here’s a video of me fiddling with the fork to show what I m…
Last reply by Patcon,
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