Good evening George, wa's up? Who said you need breathers.......
Hallo.......Hallo .......Was what I wrote in gobble dee gook or
somat!!!!!!!No breathers on an evacuated crankcase!!!!! Otherwise the
stinkin' air is gettin' in!! Duhh......The one-way header valves apply a
negative pressure in the engine case by means of the venturii effect and
pulse waves in the runners/headers. Seals and gaskets blow out 'cos
somebody didn't do a good job or, the ring seal went away. I do concede
however that gaskets in this situation should be GLUED in place anyway.
And George is right, A.I.R. pumps are being used on SOME engines. Race
on gentlemen........
..................DK.
(Scrap-Iron Racin')
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George Mitchell wrote:
>
> Hey Chris,
> I have to disagree with the blow by theory there . My
> experience with dry sumps ( drag racing) we used a
> regular breather on the top of the dry sump tank. In
> addition,we used a breather system from the valve
> covers to the headers on each side . Especially in a
> zero gap situation --- I have seen crankcase pressure
> blow out valve cover gaskets on the big end . The
> pressure has to go somewhere . The big compression
> motors are now using air pumps ( in reverse ) to
> reduce crankcase pressure .
> Just my experience and my to cents .
> George in DC
>
> --- Don Kerr <dkveuro@pop.flash.net> wrote:
> > Hi Chris,,,,,The venting of a crankcase is only
> > required when you've got
> > blow by, right, the way is to not have blow-by, how
> > do you do this? By
> > carefull assembly and using "Gapless Rings".I
> > presume you know Total
> > Seal?
> > A.P.E.P
> > 2/5 Sherwood Court
> > Wantirna South
> > 3152
> > Melbourne
> > South Australia (Closest to you, I think)
> >
> > Personally I don't assemble ANYTHING with out
> > them.The idea of a vacuum
> > in the crankcase is a HP gain too.The pistons don't
> > have to move the air
> > behind them and the oil wont froth either, 'cos
> > theres no air to make
> > foam. Good, eh? Got to do this if your racing. You
> > need a good
> > manufacturer too for the tank, must be boo coo's of
> > outlets in Aussie
> > mate.
> > My personal preference in the USA is JEGS, they are
> > on the net but I
> > don't have the address here at the mo'.
> > ...G'day mate........DK.
> > (Scrap-Iron Racin')
> >
>
>----------------------------------------------------------------------------------------------------------
> >
> >
> > Chris R Harris wrote:
> > >
> > > List, a member a few days ago asked for dry sump
> > advice and not a lot was
> > > forthcoming. I'm in the same situation setting one
> > up for the first (a
> > > little more expensive than a $60 conventional oil
> > pump thats for sure).
> > > My specific question is: Do you still vent the
> > crankcase through a breather
> > > somewhere to the atmosphere or seal it up and let
> > the scavenge sections
> > > take care of this task ? I will be using a 4 stage
> > with 2 pan and 1 valley
> > > scavenging.
> > >
> > > Any additional tips very welcome.
> > >
> > > Chris Harris. New Zealand.
> >
> >
> Do You Yahoo!?
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