[DeTomaso] Crankcase Evacuation System

[Larry - Ohio Time Corp]

I think we need to look at this a bit closer.

The motor does not need air circulation. It needs to release any pressure
from, blow by, gasses from the cylinders. If not it will blow a seal to
relieve it self (much as I do from time to time). In a motor that has
pollution equipment on it, the gases are burned with the PCV (positive crank
ventilation) system. I think the PCV systems helped the motors of the '60s
keep there insides cleaner then the motors of the '50s, that had vent tubes.

If you have a standard carb, run a PVC system. If you race your car and keep
the R's up you will have more blow by and maybe need to run both. I know
some of the racers have oil leaks at high Rs from the pressure. It has also
been proven that you do gain some HP by having a vacuum in the crank case.

Now when you have a motor like me, Webers and 180's. I plan on running a
crank case vacuum pump and the vent tubes back to the 180s.

Time will tell.


Larry - Cleveland


-----Original Message-----
From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
Behalf Of JDeRyke at aol.com
Sent: Thursday, September 24, 2009 2:34 PM
To: chendric at bellsouth.net; detomaso at realbig.com
Subject: Re: [DeTomaso] Crankcase Evacuation System

In a message dated 9/23/09 11:20:03 PM, chendric at bellsouth.net writes:

> How does this system get fresh air into the crankcase? I see two outs 
> with no in.
> 
> 

It doesn't- which is part of the problem on a low rpm street engine. Its a 
VACUUM system intended for racing, not an air circulation system. Cheers- J 
Deryke
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