When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
General Car Related Discussion.To discuss anything that is related to cars and automotive technology that doesnt naturally fit into another forum catagory.
I'm having problems sealing the downpipe to the turbo on my cosworth and after discussing this issue ith a local mechanic, he suggested using high temp silicone sealant to seal the joint
Would this work? Also, what temp does a turbo get to? @300 degC?
high modulous silicone sealant will and has sealed the manifold to the head even at dyno temps mate, ive seen it, done for many many years, exhaust paste is hit, one you have used it you will never go back, just dont go mad.
a turbo will see in excess of 850 degrees C of exhaust gas
Indeed!
Dan's right, if you have a problem getting a good seal an option is to use gun gum / exhaust paste like you use for fitting exhausts together - it seals and hardens when heated.
Did the same on mine and worked a treat.
Think you can get "Fire Gum" from places like Halfords and motor factors.
never heard of that before but i personally wouldnt use silicone on my turbo.
is the downpipe metal to metal?
i had a prob on my old frst and it turned out it had a a big o ring washer between the downpipe flange, put it metal to metal and was fine. i cant see why you would get it blowing there unless its cracked? not tight enough? or got a gasket thts not meant to be there? or wrong gasket? (i dont know if cossies have one, but im gueesing not)
high modulous silicone sealant will and has sealed the manifold to the head even at dyno temps mate, ive seen it, done for many many years, exhaust paste is hit, one you have used it you will never go back, just dont go mad.
i do mean the smelly bath stuff guys - trust me, it wont burn, it wont melt, it wornt block anything if used in the correct amounts, ive used it on the manifold on my cosworth rally cars for years and dont use manifold gaskets either
pmsl, well, i used silicon on the bike throttle bodies i fitted to my old escort, and that was fine, but inlet side.
i know silicon has high heat properties, but didnt know it was THAT high!
i once watched a n/a cosworth engine on the dyno at 9500rpm with the headers glowing red hot, with nothing but silicone sealant on them to seal to the head, i was converted way back then.
26-02-2008, 09:03 PM
Using silicone as an Exhaust sealant
