RV8 crankcase venting

[Barry Davolls]

Can anyone give advice on how to correctly vent crankcase pressures on a supercharged RV8?
Before fitting the s/c I vented to a catch tank only. After a thrashing quit often the dipstick was released through pressure build up in the crankcase.Clearly this situation will be much worse with the s/c fitted.
Should I vent into the s/c intake area or will this draw too much pressure from the crankcase?
Any thoughts?
Thanks,
Baldric

[russell_ram]

Barry,

I wouldn't vent into the sc intake. You don't really want all that crap going into the sc rotors do you? I would think you need better venting of the catch tank with big bore feeds from both rockers. Alternatively you could fit a (brake) vacuum pump from an old diesel (used to feed the brake servo), then you could ensure crankcase vacuum - might even reduce the losses of moving all that air up and down underneath the pistons. You get this effect for nothing if you run a dry sump system.

Russ

[Barry Davolls]

Thanks Russ,
I`ll try the dual vents & drill more holes in the catch tank first.
Baldric

[osgood]

Barry, I made two take off's one for each rocker cover, going to a specially made ally block, too which I fitted a PCV valve which I got from Real Steel. Then into the intake with T peice via the sevo pipe under the carb. Air is then draged in at the front of the rocker covers through Morsco breather/fillers. You could still use your tank with the valve between tank & inlet manifold. As Russ say's that way you get rid of the cr#pp but not via the blower.

My car now is a little week on tick over but system seems to work okay once throttle applied Eric.

[StuartB]

Take at look at how the drag guys do it, go to www.summitracing.com and search for part number MRG-6002 or MOR-25900 (same thing) very simple, tidy and you should be able to make your own if you like.