gasket question

[wilson]

I have the doug thorley short tube headers. I think I have a leak at the collector on my driver side header. is this a fairly standard gasket or do I need to contact thorley for a replacement?

if it is a standard thing what size should I be looking for?

Edited October 16, 2010 by wilson

[jj big shoe]

It should be a standard 2.25"(I think) size gasket. I smeared some Permatex copper on both sides of the gasket before installing it and there's no leaks.

[MY1PATH]

I tossed the thorley gaskets out and bought differant ones that I thought were better at the time. I think felpro was the brand I used.

 

 

[wilson]

right on. thanks guys!

[wilson]

does everybody agree on this 2.25? seems small to me.

[Kyle94]

from what IVE been reading and understand is that is the biggest you can go go that will give you the best results. (?) dont quote me by this, im sure others will chime in with their opinion...

[Precise1]

does everybody agree on this 2.25? seems small to me.

A=PIr^2

1.75" = 2.4" area= 100% (stock)

2.0" = 3.1" area= 129%

2.25"= 4.0" area= 166%

2.5" = 4.9" area= 204%

 

So, just how big do you want to go?? 2.0" is almost a 30% gain in area and bound to show improvements. 2.25" (what I have) is 66% increase and might be more than desirable with a high flow cat and a Flow Master exhaust. 2.5" diameter is more than double and probably rediculous. The stock exhaust is restrictive, but I can't believe it is only 1/2 the size of what is needed for reduced back pressure yet still allowing scavenging.

 

Does that help??

 

B

[Kingman]

I'm fairly sure they were talking about the gasket size for the collector pipe...

[wilson]

I'm fairly sure they were talking about the gasket size for the collector pipe...

 

this is correct.