[Fot] Valve cover breather

[Peter Vucinic]

Bill,

To avoid ANY back pressures you should fit a one way / check valve at the
exhaust venture. These type of check valves are available on some emission
vehicles. Problem solved. That what I have on my TR4.

Peter V
TR-4


-----Original Message-----
From: fot-bounces+pvucinic=netspace.net.au at autox.team.net
[mailto:fot-bounces+pvucinic=netspace.net.au at autox.team.net] On Behalf Of
Bill Babcock
Sent: Monday, 31 December 2007 9:16 AM
To: William G Rosenbach; william.tobin3 at verizon.net
Cc: FOT at autox.team.net
Subject: Re: [Fot] Valve cover breather

Much more likely to suck too hard at high RPM that not do enough. It's hard
to
set up a venturi system that's anything like linear. At Idle it could be
pressurizing the crank and at full RPM sucking the oil out.


-----Original Message-----
From: fot-bounces+billb=bnj.com at autox.team.net on behalf of William G
Rosenbach
Sent: Sun 12/30/2007 1:05 PM
To: william.tobin3 at verizon.net
Cc: FOT at autox.team.net
Subject: Re: [Fot] Valve cover breather

>>>"08 SCCA GCR; Section 9.3.37
states that it is prohibited to allow the breather to go directly to the
exhaust.

That sounds like the SCCA going 'green' on us.
Can not go 'directly', so you could evacuate a fluid separating chamber
that is in line with the crank case vent line.
I've always wondered if the exhaust Venturi could move enough air to
actually create a negative pressure in the crank case. If it was more
than up to it, excess vacuum capacity could be applied to the
transmission and rear end. Imagine, an English car that never got called
in for leaking fluids! Except for fuel from the fuel cell.
Bill R
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