I had a smoke problem on my 1275. Vented from timing case into intake
through a PVC. ( High volume oil pump, big cam, header)
When I started it in the morning it would idle for a few minutes then start
laying the smoke screen. I mean all insects and birds falling from the sky,
hide a SUV in it, smoke screen. This would last about five minutes then as
the oil temp came up it would stop. I discovered that the timing cover was
filling up and the intake would suck oil. I believe that since the motor was
breathing better because of the cam, header etc. It was producing a lot of
vacuum. Add this with a high volume oil pump filling the front case faster
then it could drain out when cold caused the oil injection. To fix this I
put a tee in the breather line and taped a hole into the valve cover. I also
plugged the hole in the oil filler cap.
It hasn't smoked once since.
-----Original Message-----
From Dan Dwelley [mailto:maine2me at yahoo.com]
Sent: Monday, April 10, 2000 10:00 AM
To: Tocci, Al; 'spritelist'
Subject: Re: Oil blow-by
Possibly valve umbrella seals bad.
If some of these are deteriorated or missing, as more
oil is pumped to the top, more oil can escape past the
guides. (i.e. guides are fine, compression is fine, no
ailings mechanically except oil burning)
Dan Dwelley
77 Midget
Alexandria, Va.
--- "Tocci, Al" <atocci@advanta.com> wrote:
> O.K. list, I'm feeling some frustration by the
> amount of oil my car seems to
> be burning for possible reasons other than tired
> rings or valves. Here are
> the facts:
>
> - 1275 no-smog equip motor running 20W-50 oil
> - freshly rebuilt head by very reputable shop - new
> guides,
> seals, et al
> - compression readings of 183 - 190 lbs each cyl w/
> all plugs
> out, throttle wide open, and no additional oil in
> the cylinders
> - crankcase is vented thru timing chain cover (dah)
> into the
> S.U.s, NOT into the intake manifold thru a PCV
> valve.
> - aftermarket valve cover with VENTED cap
> - exhaust seems to smoke most in the midrange
> (around 3000
> rpms) vs. start-up or under heaviest acceleration.
> I'm sure it's pushing
> more oil at 3000 rpms than it is at 4500 for
> example.
> - oil pressure consistent with what other folks
> report
>
> So, any ideas? Thanks much...
>
> Al Tocci
> Doylestown, PA
> '66 Sprite
>
=====
Dan Dwelley
77 Midget
Alexandria, Va.
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