Replacing exhaust system on my 72 240z from the manifold to the back

[Nick0227]

Nick,
I already had the msa Premium exhaust kit installed. I did noticed there is some detonation when i let the gas pedal go and more pronounced if i go down a hill. Is this normal?? Both of my 72 round 3 screws SU CARBS are tuned and balanced correctly. If i lean the mixture i will have detonation at the intake. Are the gasket sold by MSA good enough? My original stock system was 2". THis one is 2.5"

I would notice when the car was cool I would get some pooping but once it warmed up all was well.
I would stand behind the gasket provided by MSA


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[jalexquijano]

So these gaskets are really of good quality? The popping is only on deceleration and becomes more accentuated when the car goes down a hill with the foot off the accelerator.

[Nick0227]

So these gaskets are really of good quality? The popping is only on deceleration and becomes more accentuated when the car goes down a hill with the foot off the accelerator.

Personally I would probably find a better brand because if I'm not mistaken MSA sends a cheap cardboard type gasket.
I haven't had any leaks but maybe look for a better brand gasket for 2.5 inch exhaust and you'll probably be better off in the long run if it's a daily driver.


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[Travel'n Man]

Odds are you have blown out a section of your gasket. Dave Rebello and I were just discussing this. He recommends a for exhaust red/orange high temp etc in replacement of the gasket. I did ask him about a copper racing gasket and he has not tested them. They are about $50


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[Travel'n Man]

Sorry. Type error. RTV not ect


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[Travel'n Man]

https://zcardepot.com/engine/engine-rebuild/copper-racing-manifold-gasket-intake-exhaust-240z-280z.html


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[jalexquijano]

19 hours ago, Nick0227 said:

Personally I would probably find a better brand because if I'm not mistaken MSA sends a cheap cardboard type gasket.
I haven't had any leaks but maybe look for a better brand gasket for 2.5 inch exhaust and you'll probably be better off in the long run if it's a daily driver.


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Where do i get these high quality 2.5 diameter gasket?

Edited April 27, 2017 by jalexquijano

[Jarvo2]

I have the MSA stock manifold kit and really love it.  Sounds much better than my twice pipe setup and bolted up nicely.

[jalexquijano]

i love it too!! but have some popping on deceleration when letting the gas pedal go. Im afraid i can damage the engine and hence i have been advised the unión gaskets are not of high quality. Where do i get the nissan quality gaskets?

[Jarvo2]

The popping on deceleration is unburnt fuel leaving the combustion chamber into the exhaust system & combusting (burning) due to the heat in the exhaust. I solved mine by removing all of my smog gear, capping off the air galley and leaning out the carbs.


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[jalexquijano]

air galley? lean more tan 2.5 turns clockwise  which is the starting point?

[Jarvo2]

The air galley is the device that the smog pump pushes fresh air into the exhaust manifold with.  Most of them are leaking or damaged by now.