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Old 16 Jul 2020, 11:55 (Ref:3988692)   #1
dikko
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dikko should be qualifying in the top 10 on the grid
Exhausting question.

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...
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Old 7 Sep 2020, 11:36 (Ref:4000729)   #2
zefarelly
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zefarelly should be qualifying in the top 3 on the gridzefarelly should be qualifying in the top 3 on the gridzefarelly should be qualifying in the top 3 on the grid
Hi Dikko . . . . just seen this . . . . if the flange holes match the port and the tubes are bigger, this is no bad thing . . . . it helps prevent any reversion, although with such a tame cam it will be minimal . . . . overall header length is more important for HFF.
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Old 6 Oct 2020, 10:25 (Ref:4008804)   #3
dikko
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Ta Joe, just trying to eek another BHP out of it. Best brake later I suppose!
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Old 6 Oct 2020, 13:00 (Ref:4008823)   #4
IsabellaKelly1979
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IsabellaKelly1979 should be qualifying in the top 10 on the grid
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?

In my opinion it may result in power loss quite substantially, but I will ask my friend who is abroad at the moment and knows a little bit more than me
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