DragBikeMike
Serious Thumper
Offline
SuzukiSavage.com Rocks!
Posts: 4169
Honolulu
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Seat-o-da-pants was not much help. It kinda felt crisper with the CrankVent but you know how that goes. It’s a crap shoot.
One way to compare the CrankVent to an open breather was fuel mileage. Perfect, I was doin carb testing so I could see if the CrankVent improved fuel mileage. No such luck. The open breather got 59.2 mpg while the CrankVent got 58.1 mpg. I would say that’s a tie, within the margin of error.
I tried several timed runs to see if one configuration is faster than the other. The 2nd gear 4K to 7K times were exactly the same, 2.90 seconds I thought this contraption had potential. I was wrong. My motorcycle runs exactly the same with or without the CrankVent. It’s a wash.
Interesting Observation: Early on, when I was using a different vacuum gage on a higher compression engine, the crankcase would go into pressure when I went WOT. As it approached 7500 it would be pressurized as much as 2 psi. That’s a small number, but it still indicates that I didn’t have an ideal ring seal. With the new ring set, the crankcase pressure remains a slight vacuum all the way up past 7K (with or without the CrankVent), and it pulls the highest vacuum ( a blistering 1.5” Hg) when the engine is under load.
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