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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Thought this may make a good theoretical discussion. While I have far to little time to do the inordinately long list of jobs on my Z (and with school fees ramping up spare cash is drying up fast), I just can’t help think one day I really want to do a triple DU6 conversion!! Just imagine having the only z in the world with these puppies on!!! How cool would that look when you pop the bonnet!? It will need a LARGE balance tube to even out the pulses (which somewhat negates benefits of individual throttles). My only thought is that the best way to feed the vacuum signal to all carbs but without causing cross carb fuelling is to feed manifold vacuum in at the t…
Last reply by jonbill, -
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This isn't a new issue and I don't reall plan to fix it, but I'm curious what causes it. My '77-'78 5-speed trans does not center from the left. The 5/R gate centering spring works fine, but it doesn't center from the 1/2 gate. Is this a common issue and is it fixable without a major overhaul? The trans only has about 70,000 miles on it. I bought a rusty original owner low mileage '77 30 years ago to harvest the trans and interior which are both in my '78. The car sat around for many years, and at some point, the centering spring quit working. The trans shifts great other than the lack of centering. It's the only Datsun trans I've ever had with this issue.
Last reply by Jeff G 78, -
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Mount them dry or sealant on both sides? I have always used a thin layer of sealant on either side of the paper gaskets for the timing cover and it works, no leaks but no matter how careful I am there are always some that squeezes out and looks bad. Anyone had no leaks with just the paper gasket?
Last reply by Mark Maras, -
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I drove the car earlier today and noticed the oil under the car. I always thought it as the crush washer from the oil plan not being replaced, but I noticed gear oil pooling where the bell housing and dust over meets. I have noticed once the car is warm, it is difficult to shift into first gear at times, and it has grinded in 3 occasions. any ideas what I would need to replace, and if this is the reason for the difficulty getting into first?
Last reply by Patcon, -
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I pulled my valve cover to adjust my valves and discovered that my oil spray bar was in bad shape. The distribution blocks were bent a little and weren't sealing against the cam journals and the short tubes at front and rear were no longer parallel to the cam. Did a little searching and discovered that this is a very common problem. Clogged, leaking, bent, falling apart. After studying the factory design, I believe it is a misapplication of materials. The steel tubes are "soldered" into the aluminum distribution blocks at one end, and are brazed to the steel center mounting bracket at the middle. Not only does solder not stick to aluminum in the first place, but the ther…
Last reply by grannyknot, -
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Cody is trying to talk me into building a motor for "Lily". I have an engine in another Z that might be good. We will pull that drive train and see if that motor will run. That might end up as plan B. I have two different 280zx turbo motors in my shop and I also have a V07 crank laying around. I had thought I would buy a stroker kit from Rebello minus the crank and build up a 3.0L motor with some Z therapy carbs for now, but I could go with one of the turbo motors. Please chime in with your thoughts. Pros & Cons Thanks, C
Last reply by Patcon, -
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Hi I want to go back to original rear diff. That include to instal a R180 instead of my R200. I bought the car with the R200. I´ve found an R180 but the gear ratio says 3.545(3911) and comes from a Automatic. I have a 5 speed transmission so will that make problems for me? My car is a 240Z, 1973. I´m not racing just cruising.
Last reply by dutchzcarguy, -
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As I return my May 1970 240Z back to original specification I'm in need of a flat mustache bar to fit a R180 diff. The car came to me with a R200 diff, so that is being replaced with a R180. I have 2 curved later mustache bars if anyone is interested in a swap. Roo
Last reply by SpeedRoo, -
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My 1972 (11/71) 240Z is in the garage for engine work. The shifter has been in the neutral position all that time. Now that it's ready to be test driven we find that the shifter is hung up and will not engage first or second gear but only third and fourth. On an important side note, the car was two miles inland during hurricane Ian and flood water came up about 18 inches on the sides of the car. Don't know whether water may have found a way in. Thoughts please.
Last reply by Yarb, -
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Hey there! I have been getting some great tips from you guys. I own a 1971 240z. Original l24 with a 5 speed installed by prior owner. The other day, I was replacing leaking master and slave clutch cylinders and I noticed the following stamped on one side of the transmission housing: L5 "NMCA" and "#3" on the other side. Does anyone know what kind of 5 speed this is and gear ratios? Any help would be greatly appreciated. Thanks!
Last reply by dutchzcarguy, -
- 2 followers
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Looking for an early 4 speed transmission cross member for my May 70 03802 240Z. I have a 1972 cross member but it's the wrong one for the early 240Z I have. Happy to swap my 1972 mount for an early one if anyone is interested. Thanks, Roo
Last reply by SpeedRoo, -
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I believe there is only a few minutes running time on an engine I'm tearing down at the moment. This is the #1 cylinder and is the worst one, there is a minor amount on a couple of others. Also, the rod bearing shells.
Last reply by grannyknot,
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