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

[Dave Londry]

That's F1 stuff also.
Pull a hard enough vacuum in the crankcase and windage goes away.
You just need to look after the oil cloud.
dave

adin at frontier.net wrote:
> some folks "today" run a vacuum pump on the crankcase . . .
>
> Those long pulls at 9000rpm can be trouble!
>
>
>
> Quoting Ken Green <kenn_green at yahoo.com>:
>
>   
>> 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
>>>
>>>
>>>
>>>