[DeTomaso] Venting crankcase to valve cover (was Oil pan gasket recommendation?)

[Ken Green]

I recall that back in the mid 70s people did things to keep oil out of the heads, things like restricting the flow of oil through the pushrods.  I think the belief was that under prolonged high RPM running (which might be 5,000 RPM with a stock Cleveland) the oil did not drain back into the pan fast enough, resulting in oil starvation.
 
Ken

--- On Fri, 10/3/08, Tomas Gunnarsson <guson at home.se> wrote:

From: Tomas Gunnarsson <guson at home.se>
Subject: [DeTomaso] Venting crankcase to valve cover (was Oil pan gasket recommendation?)
To: "DetomasoList" <detomaso at realbig.com>
Date: Friday, October 3, 2008, 12:01 PM

Is there really an issue with venting the lower part of the engine to the valve
covers? I'd have thought that even with the head drains completely filled
with oil returning to the crankcase there'd be enough combined passage area
through the lifter area floor and pushrod holes to vent whatever blowby there
is.

Tomas

----- Original Message ----- 
From: "Barry Seib" <oldwheel at mts.net>
To: "Drew, Mike" <MikeLDrew at aol.com>; "DetomasoList"
<detomaso at realbig.com>
Sent: Wednesday, October 01, 2008 11:01 PM
Subject: [DeTomaso] Oil pan gasket recommendation?


> Mike
> I think Larry may be right on with his suggestion. If there is no leak
> except at high RPM, that's a very strong indication that no matter
where the
> leak is, excess crankcase pressure is likely causing it. I suspect the
> factory PCV system is totally inadequate for sutained very high revs. You
> might try the same run with extra NASCAR or circle track type breathers to
> see if the problem is solved.The other issue is making sure that the
> crankcase can breathe to the valve covers (if that's where the extra
> breathers are). If the heads and drainbacks are all flooded with oil so
that
> can't take place, you will have to remedy it first - or put a breather
> directly to the crankcase by some other route to stop the leak. MD must
have
> dealt with this issue a long time ago.
> 
> Dawg? What say you?
> 
> Barry
> 
> 
> 
> [DeTomaso] Oil pan gasket recommendation?
> Larry - Ohio Time Corp larry at ohiotimecorp.com
> Wed Oct 1 12:54:55 CDT 2008
> 
> 
> 
> Hi Mike,
> 
> You may want to check you venting / PCV system. At high RPM the blow-by is
> at its highest. I have seen crank cases pressurized and blow oil out a
> normally good seal. If your heads are full of oil the venting system may
not
> be working to well.
> 
> Larry (no, tarter sause) - Cleveland
> 
> 
> 
> _______________________________________________
> 
> Detomaso Forum Managed by POCA
> 
> Archive Search Engine Now Available at http://www.realbig.com/detomaso/
> 
> DeTomaso mailing list
> DeTomaso at list.realbig.com
> http://list.realbig.com/mailman/listinfo/detomaso
_______________________________________________

Detomaso Forum Managed by POCA

Archive Search Engine Now Available at http://www.realbig.com/detomaso/

DeTomaso mailing list
DeTomaso at list.realbig.com
http://list.realbig.com/mailman/listinfo/detomaso