View Single Post
Old 15 Mar 2021, 15:46 (Ref:4040576)   #5
Join Date: Nov 2006
United Kingdom
Cornwall, UK
Posts: 35
Gungebucket should be qualifying in the top 10 on the grid
Originally Posted by dikko View Post
it's only a lowly Kent Formula Ford engine but I have noticed there is quite a step-out in the opening of the exhaust on the pipe manifold.

The pipes are a much larger bore than the outlets on the head.

Q. Would this step create enough turbulence to result in power loss by creating back pressure and upsetting exhaust flow?
Q If so how much? Anything significant?

I wonder if there is an advantage in funnelling out at that point or am I whistling in the wind and just need to put my foot down further and close my eyes more...
Having spent a lot of time building FF Kent engines and doing exhaust development I can tell you ( fact not opinion) that you should leave the primary pipes with the step to the exhaust port. Any attempt to provide a taper simply results in lower power output.
Gungebucket is offline