Have you read the description of the 6696? I don't know a lot about flywheels but I would get the 6696 over the 6626. I don't think these engines run as hot as we think they do but I would call ARC to verify whether or not it would work in a non racing application where cooling is needed at lower than racing RPM.
Billet flywheels without fins are usually run on drag racing engines that burn alcohol. Alcohol motors run much cooler and do not run for long periods of time.
The speedway flywheels have fins, but are a bit shorter than the standard ones for less drag. ARC's website isn't completely clear on whether or not it moves enough air for just average riding or if its only recommended for racing.
i use the short fins on two my engines and on cool nights when racing i tape up the recoil cover so no air can drag down the engine. if the bike is moving you really don't need the fins.
The speedway flywheels have fins, but are a bit shorter than the standard ones for less drag. ARC's website isn't completely clear on whether or not it moves enough air for just average riding or if its only recommended for racing.
From their website:
"The new 6696 billet flywheel from ARC Racing has an ultra low drag fin design that will greatly reduce air drag on your racing engine, while still moving enough air for cooling. "
So I assume it moves enough air for cooling for racing and for average riding.
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