Breather Concepts, ...taking one from Jake Options

[yeahmag]

I'm considering blocking off my head vents and running a -10 or -12 breather solely from the oil filler/breather to a Morosso breather tank (or the like). The idea here is to keep the crankcase at a lower pressure than the heads so the oil tends to move from high pressure to low (aka from the heads to the case).

Anyone else doing this yet? If so any comments or pictures?

Thanks!

[HAM Inc]

Len,

Do you have a picture of that? I was thinking of just drilling out the stock location (PCV valve) to a -12/-10. I'm only running 6200RPM *max*. But I'd like to see what others have running. No need to re-invent the wheel...

Aaron, I welded a -12bung to an aluminum plate that bolted to a cross bar that mounted in the chimney. It would be tough to do that with the engine in the car.

The drainback slots on a type 4 crankcase aren't narrow, nor are they restrictive.

I don't think my 1300sq.ft. home is too small either, but some would disagree.

Anecdotal evidence to the contrary (factory design changes, etc.) notwithstanding, there's no proof that unvented heads are beneficial to oil control in comparison to a well designed breather system on a carbureted T4 engine.

Anecdotal? I'll bet that we did far more testing of oil systems and breather systems than you have. And we approached it with an open mind, something that is essential to progress. Several breathing systems were employed and observed in action on Jakes chassis dyno. We then went out and beat holy hell out of the engine on the track. Two full seasons of competition and one cup of oil in the overflow can total for the entire season!

Ask yourselves this. If you have a breather in the heads and the oil line comes loose from the breather can, why does it puke oil out of the line from the head? Think about that for a moment.

Personally I don't care if folks vent their heads or don't. I'm not selling breather cans and I have no vested interested in how people deal with this. I do advise all of my customers not to vent their heads. So far everyone has been positive about having less oil lines and leak potential.

I've been through this topic before (and was genuinely flummoxed by some of the defenses of vented heads) and I have now said all I have to say about it.

[dstar]

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Personally I don't care if folks vent their heads or don't. I'm not selling breather cans and I have no vested interested in how people deal with this.
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But Chris DOES! SURELY he isn't up to allowing folks to find out that
they don't need an VERY expensive catch can from him......

T4 heads don't need venting, PROVEN FACT.

Don