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Re: Dumb Question

To: "Shawn J. Tobin" <tobisj@aud.alcatel.com>
Subject: Re: Dumb Question
From: Ulix Goettsch <ulix@u.washington.edu>
Date: Mon, 8 Dec 1997 13:25:39 -0800 (PST)
Cc: Spridgets@Autox.Team.Net
In-reply-to: <9712081913.AA08012@kruse1.aud.alcatel.com>
Reply-to: Ulix Goettsch <ulix@u.washington.edu>
Sender: owner-spridgets@Autox.Team.Net
Shawn wrote:
> 3)  The vent tube or "road draft tube" is designed to pull the blow-by
> gasses out of the crankcase and is an early attempt at Positive Crankcase
> Ventilation (PCV).  A slight negative pressure is necessary on the 
> crankcase of any A-series motor to prevent oil from seeping out the
> rear main seal.  Alternatives to the draft tube are either a gulp valve
> fitted to the intake manifold like the '67 models used or dragracers
> often plumb a rearward angled tube into the header collector to draw
> the fumes out of the crankcase (unknown if the latter has been done on
> our engines).

Yes, David Vizard talks about it at length in his book.

> Moral:  You need PCV in your engine.

Yes!  Been there, done that, reconnected it...

    Ulix                                                    __/__,__        
.......................................................... (_o____o_)....
                                                           '67 Sprite


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