Actually, I know this can be managed better, though what I know works best
with a dry sump. It's pretty easy to build a swirl can that will return the
oil to the crankcase. On my Radical I would put about a quart of oil in the
catch tank every 30 minute race. Obviously a problem for endurance races. I
made a swirl can with a helical separator structure inside--the oil/air vapor
from the breather went in at an angle in the bottom side (promoting swirl) and
exhausted through the top of the can. The oil that collected on the can sides
and the separator fell to the bottom and returned to the sump. If this went to
a catch can with a fairly restrictive filter on top that had a line going to
the divergent side of the header collector it would draw a slight vacuum on
the system and might reduce my general engine spewing. Might be worth fiddling
with. Not purely legal, but if an organization's tech guys didn't like it I
could just blank off the hose.
-----Original Message-----
From: DSPGTi@aol.com [mailto:DSPGTi@aol.com]
Sent: Sun 12/30/2007 8:20 PM
To: N197TR4@cs.com; jwags@dotnet.com; wgrosenbach@juno.com;
william.tobin3@verizon.net; Bill Babcock
Cc: FOT@autox.team.net
Subject: Re: [Fot] Valve cover breather
I'm very surprised any Vintage organization would allow any crank case
venting connecting to the exhaust system. After all we are talking about oil
being
injected in the stream after combustion. It has been prohibited by SCCA as
long
as I can remember, however there appears to be no mention in the 1972 GCR
rules under the "oil catch tanks" section. The second oldest GCR that I have
on
hand (2003 17.26) states the exact wording as the 2008 GCR: "A crankcase
vacuum
breather that passes through the oil catch tank(s) to exhaust systems or
vacuum devices that connect directly to exhaust systems is prohibited."
I have yet to run my TR4 hard enough or long enough but my VW Rabbit can put
a half a quart in the catch tank on a hot day during a 20 minute session. On a
3 hour enduro we have to add a quart at a pit stop on a Scirocco and finish
almost a quart low. Both engines are very strong with minimal leak down.You
wouldn't want to be following me with that going out my tail pipe.
Dave Y.
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