T Mack 1 - FSO
Serious Thumper Alliance Member
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sold 2001 LS650 for a 1986 XLH1100
Posts: 2919
Emmaus,Pa
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On any car, you can't just plug the vent as there is always "blow-by" (rings aren't perfect....). On an older big engine, it runs a bit funny. On newer engines where they shrink it to the bare minimun, yea, I guess you could push out a valve cover gasket.
I take it you never owned a "pre-emissions" car. Back in the day, the crankcase vent was part of the oil filler cap on many cars, just some srceening, nothing fancy. On many jeeps and trucks, it was just a pipe sticking out the side of the engine. Then came the '70's and they decided to put the bad bad fumes into the carb. They used a PCV valve (positive crankcase ventilation) to help control the flow of fumes.
So, to answer you question, the LS650 needs a vent. Putting it back into the carb circuit just helps the enviroment. And...hot oil vapors condensate, so when you build your vent, make sure the condensate has somewhere to go.
T-Mack
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