replacement for exhaust manifold gasket
05-03-07, 06:26 PM
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replacement for exhaust manifold gasket
has anyone ever used rtv or something similar in place of the exhaust manifold gasket? the reason i ask is because i suspect i have warpage somewhere on the mating surface of the manifold and or block. today i took the manifold off, laid a bead of high temp rtv on it, and put it back together without the gasket. do you think this will leak? im going to give it the full 24 hours to cure before i start the engine. its rated up to 700 F so hopefully it will work.
anyone every tried anything like this?
anyone every tried anything like this?
05-03-07, 07:33 PM
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is that hotter an average piston engine? i have heard of many people doing this with muscle cars, and apparently it worked well for them.
Last edited by brianwarner983; 05-03-07 at 07:42 PM.
05-03-07, 08:30 PM
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i was also considering using 2 gaskets instead of one. would this help to fill in the warpage? i m somewhat desperate to fix this, as it is causing exhaust gasses to get into my passenger compartment. getting high on exhaust FTL!!!!!!!! plus it sounds really ricey.
05-03-07, 10:21 PM
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theres the gasket i took off. it almost looks like its the wrong gasket or something.
but anyway, i cant see where the leak was coming from. im so confused.
05-03-07, 10:27 PM
#7
Rotaries have astronomically high exhaust heat. Like in the neighborhood of F1 cars. A tuned rotary can have up to 1600 degree exhaust temps, while it is more like 1200-1400 for regular ones. This is far beyond the reach of any RTV.
As a personal example, I had an exhaust leak from a warped flange. Keep in mind this was where the manifold bolted to the RB downpipe (stock precat location), not the actual engine manifold gasket which is even hotter. I replaced it with a new OEM gasket and put 750 degree RTV on it for good measure. 2 days later I heard the leak was back so I looked at it. To my surprise the gasket was literally vaporized along with all traces of the RTV.
So no, it won't work.
As a personal example, I had an exhaust leak from a warped flange. Keep in mind this was where the manifold bolted to the RB downpipe (stock precat location), not the actual engine manifold gasket which is even hotter. I replaced it with a new OEM gasket and put 750 degree RTV on it for good measure. 2 days later I heard the leak was back so I looked at it. To my surprise the gasket was literally vaporized along with all traces of the RTV.
So no, it won't work.
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