-----Original Message-----
From Brashear, Jack, N
Sent: Wednesday, February 13, 2002 3:32 PM
To: 'Charles Christ'; David N Waldmann; Spridgets-Autox.team
Subject: RE: 1275 Venting
Hi All, I just picked up on the 1275 venting thread. For what it's worth to
anyone, here's what I did about seven years ago. The engine must be removed
to do this. I drilled through the blanked-off fuel pump boss and tapped it
3/4" NPT then screwed in a 3/4" threaded x female brass adapter and soldered
in a 3/4" plain end 90 degree elbow turned upward and a little toward the
front to clear the No. 1 exhaust header pipe. After that, I clamped a 3/4
I.D. rubber hose to the elbow and ran it up to about valve cover height. I
finished all this off with a $2.00 breather from Pep Boys inserted into the
upper end of the hose and clamped. Just fabricate your own little sheet
metal bracket to the front exhaust manifold stud to hold everything steady.
Works like a champ, doesn't leak or run over, and breathes like elephant
lungs. The usual oil puddle at the rear of the engine was reduced to a very
occasional dime-sized drip. Some people have said this couldn't be done
successfully, but I'm here to tell you that it can. BUT CAUTION, I have
heard of people trying this with diameters smaller than 3/4" with bad
results... might have something to do with the velocity of the oily vapors
and the actual wall surface inside the rubber hose??? Feel free to contact
me if you want to chat about this.
Jack Brashear
Little Rock, Arkansas
-----Original Message-----
From Charles Christ [mailto:cfchrist at earthlink.net]
Sent: Wednesday, February 13, 2002 12:43 PM
To: David N Waldmann; Spridgets-Autox.team
Subject: Re: 1275 Venting
that's the evacupan system. popular with the V8 crowd for years.
chuck
----- Original Message -----
From "David N Waldmann" <david at vermonthardwoods.com>
> David Vizard details exhaust extraction for ventilating the crankcase. It
> uses the flow of exhaust gasses past a tube inserted just after the header
> and requires an anti-backfire valve to prevent explosions, as well as a
free
> flowing exhaust system to be effective.
>
> He has a name for the idea, but I can't remember what it is.
> > My 1275 vents through the breather can on the timing chain cover and
> > (I guess) through the oil cap orifices. Doesn't seem like a whole lot
> > of venting. I've read about adding a crankcase vent at the unused
> > mechanical fuel pump spot. Is that worthwhile? Also seems that a
> > substantial vent in the valve cover would also help reduce pressures
> > that push oil past the crankshaft scroll "seal."
> >
> > Comments?
/// unsubscribe/change address requests to majordomo@autox.team.net or try
/// http://www.team.net/mailman/listinfo
/// Archives at http://www.team.net/archive/spridgets
|