Just to stir the pot a little. I seem to remember just a few years ago one
of the top fuelers was running without a pressure pump in competion. Ran a
pressure tank and a scavange pump. Oil was always clean, same pressure and
temp. Don't take much oil to last 4.5 seconds. Interesting concept though.
----- Original Message -----
From: "rgribble" <rgribble@carolina.rr.com>
To: "'Glenn Ridlen'" <gridlen@yahoo.com>; <land-speed@autox.team.net>
Sent: Sunday, January 26, 2003 9:05 PM
Subject: RE: Dry sump
> Glenn & List,
>
> For the Buick, I have purchased a Peterson adjustable vacuum regulator
> to regulate crankcase vacuum, its range is from as high as 29.7 in/hg
> down to 2 in/hg.
>
> They (NASCAR) have changed valve guide and seal materials just so they
> can run the high numbers. Of course sucking the oil from the valves is
> not a good thing and not my idea of chances I'm willing to take. I
> already run 5 wt oil which doesn't leave much room for error.
>
> Aside from sucking oil down the valve guides, these high vacuum readings
> are the reason most NASCAR engines do not use gaskets, (especially thick
> gaskets) it's metal to metal with a little RTU for looks.
>
> Another point I should make is that on a dry sump pump you have one
> stage that is pumping the oil to the engine. Then there is multiple
> scavenge stages, up to 5 are common, that vary in width (capacity), that
> do the vacuum. Therefore, a typical pump can pump minimal oil with high
> vacuum capabilities without major HP concerns.
>
> Grib
>
> "Do what others Won't and you'll do what others Can't for the rest of
> your life"
/// unsubscribe/change address requests to majordomo@autox.team.net or try
/// http://www.team.net/mailman/listinfo
/// Archives at http://www.team.net/archive/land-speed
/// what is needed. It isn't that difficult, folks.
|