Blowing Exhaust manifold.

Alley Kat · Post by **Alley Kat** » Fri Jul 20, 2007 9:56 pm

Mine weren't too badly out but continually blew, though part of the prob was a small nick in the face, must have gave a narrow contact area in one spot .

tetlow · Post by **tetlow** » Fri Jul 20, 2007 10:10 pm

Stainless ceramic coated inside and out blockhuggers.

Blow like bu**ery

mgbv8 · Post by **mgbv8** » Fri Jul 20, 2007 10:26 pm

Have you pit a straight edge across them Dave?

tetlow · Post by **tetlow** » Sat Jul 21, 2007 7:32 am

I have had them on a very nice Granite Surface table. They are not too bad but a good look shows the flanges are angled up to about 1mm off true.
I was going to grind and linish them myself but the MGOC gave me a company they use, ( Iver Searle) and I gave them a ring. I will take them there and they will do them as I wait. They have a chap to linishes them by hand, seems best to let someone who knows how to do it have a go first.
Dave

Paul B · Post by **Paul B** » Thu Jul 26, 2007 2:48 pm

tetlow wrote:Paul.
What Silicon would that be?
I have tried exhaust paste and it was crap.
Dave

Any non-hard setting 'heatproof' silicon sealant will do. The stuff is virtually bulletproof. I used to use the stuff on huge diesel Caterpillar turbo manifolds, and they glow red.

tetlow · Post by **tetlow** » Fri Jul 27, 2007 11:28 am

Cheers Paul
I have some silicone that stays flexable. It has a max temp of 350C.
This is about the highest I can find at the moment.
I drove out passed Cambridge yesterday to get the manifolds ground, only to be told they could not do it!

I saw a hand linisher they had which looked good for manually levelling them. It was made by DIAFAST.
I am at the moment trying to find a supplyer. It looks like a Surform but has Hook and Loop abrasive strips on the bottom.
Does anyone know where I can get one please.

Dave

Paul B · Post by **Paul B** » Fri Jul 27, 2007 3:59 pm

tetlow wrote:Cheers Paul
I have some silicone that stays flexable. It has a max temp of 350C.
This is about the highest I can find at the moment.
I drove out passed Cambridge yesterday to get the manifolds ground, only to be told they could not do it!
I saw a hand linisher they had which looked good for manually levelling them. It was made by DIAFAST.
I am at the moment trying to find a supplyer. It looks like a Surform but has Hook and Loop abrasive strips on the bottom.
Does anyone know where I can get one please.
Dave

Linisher? Naaaaah. Getting too complicated. If I were at home I'd offer to do them for you.

Paul B wrote: A flat surface (to check against) and a 4" grinder with a flap disc in and you can flatten them yourself near enough to seal. They don't have to be perfect to 0.005", just close enough that a gasket and a squeeze of silicon will seal them.