Don,
Just going by whats works for me in the past on big
motors ( over 600 Cubic inches ) with a low tension
rings and compression close to diesel status....
Everybody must go with what works for them.
George in DC
--- Don Kerr <dkveuro@pop.flash.net> wrote:
> 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')
> > >
> >
>
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> > >
> > >
> > > 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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