If one suddenly LOWERS the exhaust restriction on a 2 stroke OB, will the jetting need to be changed? If so, will it need to go leaner or richer?
Thanks,
Jeff
If one suddenly LOWERS the exhaust restriction on a 2 stroke OB, will the jetting need to be changed? If so, will it need to go leaner or richer?
Thanks,
Jeff
"We live at the bottom of an ocean of air." - General Marvage Slatington
I guess it's not that easy a question to answer after all!
I recall having to re-jet richer when I put open headers on my Pontiac, but that was four stroke.
Jeff
"We live at the bottom of an ocean of air." - General Marvage Slatington
It depends on how efficient the motor was to start with......but ultimately, I would say a bit richer. It will be more powerful than a closed restricted style exhaust, but more feul will be evacuated during the induction because of less restriction on the exhaust side, resulting in more needed fuel. It might become a slightly faster "gas guzzler". Stock race engines are kind of like that.
My Champion Hotrod came with the optional "open Stack" along with the stock cover plate. I tried my open stack, and besides having ringing ears I noticed that the exhaust was wet with residue oil/gas. It will go a bit faster as well. I turned my carburetor a little bit richer and it seemed not to mind at all when I did also.
Thanks!
Jeff
"We live at the bottom of an ocean of air." - General Marvage Slatington
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