[Land-speed] Crankcase breathers

[Dave Dahlgren]

How many stage dry sump pump and how are the scavange lines laid out??
Dave
----- Original Message ----- 
From: "Tom Bryant" <saltracer at awwwsome.com>
To: "Landspeed" <land-speed at autox.team.net>
Sent: Monday, July 07, 2008 10:50 AM
Subject: [Land-speed] Crankcase breathers


>I have been having problems with oil aeration which causes a drop in oil
> pressure in toward the end of a run, especially since replacing my dry 
> sump
> pump. When we were doing the dyno work this in April, John suggested that 
> I
> was pulling too much air into the crankcase. I had a breather on each 
> valve
> cover. We taped off on valve cover and picked up about 10 psi at the upper
> rpm, which verified his suggestion.
>
> A few years ago, I was discussing crankcase breathing with my previous
> engine guru and he said since it was good to have a vacuum in the 
> crankcase,
> the conventional wisdom was to use a closed system with a pressure relief.
>
> Does anyone know where I can buy a closed breather with a built in 
> pressure
> relief. So far I have been unable to locate one on the net.
>
> Tom