Carb insulator question

MikeG

MikeG

VIP MEMBER
Joined
May 31, 2012
Messages
1,246
Country flag
Are gaskets required on both side of manifold to head insulator?
 
The Andover drawing shows no gaskets (1 & 1A are 1/16" & 1'8" thick respectively):
Carb insulator question
 
I use a paper gasket on either side of the phenolic spacer along with Yamabond. Phenolic is not a gasket. If you apply yamabond on the phenolic and the head the intake will suck all the gasket goo and there will be an air leak. That makes an airtight seal. for the carb to manifold I rely on the o-ring.
 
That might depend on the insulator surface.
I got a Bakelite insulator off M,M and I Engineering which got a light coat of WellSeal to all four surfaces and left to tack off.

Carb insulator question Carb insulator question

Heat might still soak through to the manifolds via the fasteners at rest with a hot engine.
 
MikeG said:
Are gaskets required on both side of manifold to head insulator?
Click to expand...
Lots of disagreements on this!

I say: Amal specified them, Norton, Triumph, BSA, et. Al. used them. None of them specified gaskets or sealers as far as I know. I certainly do not. If they are not in good condition, I change them.
 
Bonzo said:
Out of interest, what would one hope to achieve by fitting one instead of the other (1/16" & 1/8" insulators)?
Click to expand...
Cooler carbs with thicker. If I remember right, Triumph only uses thick ones. Today Amal sells them in 20mm to 32mm and only thick.
 
Another application where spray Copper Coat comes to the rescue.

Carb insulator question
 
Last edited:
I used paper both sides and a bit of blue hylomer and mine are rubber mounted , cooler carbs .
 

Attachments

  • Carb insulator question
    IMG_0541.png
    474.3 KB · Views: 31
You must log in or register to reply here.
Back
Top