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!?
|