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Discussion Starter · #1 ·
Akkkkk! Well my problem is this.. I have a 1978 Datsun 280Z, When I take my foot of the gas and the engine is a hi load/hi RPM, she blows white clouds of smoke.. Big ones.. Now a good example of when this happens is.. At about 110mph if I take my foot of the gas she Puffs continuously until I drop under 4k. Or if I am accelerate quickly and shift at about 6K I see small puffs. Now the obvious example is DON'T DRIVE SO FAST!! But **** those Hondas just piss me off... :p jj Now some things I know about the motor. I have 165?? on a compression meter on all cylinders. The plugs are old (I haven't looked at them for oil traces in a wile) and the PCV valve is old.. The head gasket is new, so it the timing chain and tensioner, as well as most of the gaskets.. I think this is the reason I blew my head about 3 weekz ago, Same situation, I was trashing a Honda, I know I know... And after the LONG run I slowed down to cruzing speed and made my exit, (about 2 miles) then I made a left under the overpass, I down shifted into 2nd, brought the tack up to 2.5k and pfft, lost all motor power.. Then she came right back up, slight loss in power and a pfft pfft pfft sound. I brought her home I lost all pressure on 3,4 and 6. But no Oil or water loss or mixture(kinda cool demonstration of Nissan Engineering). So I drove her to my buddies and he had know idea how that could be happening. So I brought it home, pulled the head and carbon traces between cylinder 3 and 4 and between 6 and the outside of the block. So i rebuilt it all. head up.. Don't worry I do good work.. In my mind at least.. so I scraped and polished all the gasket contacts replaced all the hoses, and it cranked over 1st try. But I still have this problem.. She breaths smoke... Sorry for the long post, I just need some advise and I think this is the best place to get it. :)

P.S. You can expect another one of these when I get my 280ZXT block.. (o_O)

Anyway thanks for any advise you can give!!
 

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Discussion Starter · #3 ·
I checked the head and block. They are both flawless. That was the first thing I checked.. I torqed all the bolts in order as per Nissan. I double checked the bolts yesterday, same. I still have no oil in water or water in oil. The block is clean and shows no external oil leaks and the radiator is still full. So I don't think it is the block.. But I am going to recheck it again.. I do try and follow the break in rule.. And normaly i am a very saine individual.. I may have given you a unruly impression in my last post, and sometimes I am. But I take VERY good care of my baby.. I know that it only takes once to mess it up big, so I don't blame anyone for my misfortune :) I am thankfull for you advise thou, and I will continue be a Z guy forever!! Oh and I don't just Grudge on random Honda's just a few fellas I know who talk SMACK about Nissan. ;P
 
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