2 litre exhaust

[AndyN]

Hi all. I need a new exhaust for my 2 litre saloon. looking at the one fitted the diameter of the exhaust pipe is a lot smaller then the diameter of the manifold! can anyone let me know what the pipe diameter should be? Also do i need to  retain the 2 expansion bikes on the manifold as they only seem to make the engine bay hotter. Could i blank these off?

Any advice would help
Andy

[Robin A Woolmer]

The Ace Exhaust Manifold Pipe diameter is 1.375" OD The Exhaust pipe before the silencer is 1.625" OD
Clearly it would be an advantage to have a new fabricated manifold & get rid of the iron original AC manifold as you should improve performance with better gas flow.
Robin

[GSouthee]

Hi Andy

When I had my Weller engine I took cans off and made 2 blanking plates. I found it ran better.
I also matched the ports and manifold with a small grinding ball.
Gary

[GSouthee]

I forgot I went to 1.75. Stainless pipe with a stainless exhaust box. Also helped.

[AC-Crankcase]

When I was running a Saloon, a while back now when I was a student, I kept the manifold and cans and the silencer under the drivers chair but put on a 2" straight drainpipe from there to the back and got rid of the big box by the back axle.  I am not sure how much better it ran but the sound!!!!

Tom

[GSouthee]

Tom.
Nothing but a hooligan.
Gary