Oil issues: Dry Sump, Accusump for road racing?

[C.Plavan]

Chad if you are worried about the vacuum/positive aspect, you can leave your line hooked up but add this:



One Way Valve - Inline Pop Off

Breather assembly is installed in line from engine's crankcase. Valve seals engine from air entering engine, but opens in the event of crankcase pressure, allowing crankcase to vent.

08-1440 Inline Pop Off -12 AN

http://www.petersonfluidsys.com/engine_breath.html

I'm betting I could just use this for half the cost.

http://www.summitracing.com/parts/sum-220195b/overview/

[Sgt.Gator]

I'm betting I could just use this for half the cost.

http://www.summitracing.com/parts/sum-220195b/overview/

Yep, same thing. Good find. Although it's a flapper valve, may not work well for air. A big PCV valve (ball valves usually) would work too.

[C.Plavan]

Yep, same thing. Good find. Although it's a flapper valve, may not work well for air. A big PCV valve (ball valves usually) would work too.

Hmm not sure if it will work now. I called Peterson. Their's is a metal valve (kinda like an exhaust valve with a 2 lbs spring), The other is a PTFE flapper valve. Yeah- I'm not sure if the PTFE flapper could handle the vacuum or not.

[Sgt.Gator]

Hmm not sure if it will work now. I called Peterson. Their's is a metal valve (kinda like an exhaust valve with a 2 lbs spring), The other is a PTFE flapper valve. Yeah- I'm not sure if the PTFE flapper could handle the vacuum or not.

Best to stick with what Peterson has spec'd for this type system. I'm going to monitor with a $10 gauge on sale at Summit. If I ever see positive pressure I'll make changes.



http://www.summitracing.com/parts/sun-cp8213/overview/

[biknman]

Hmm not sure if it will work now. I called Peterson. Their's is a metal valve (kinda like an exhaust valve with a 2 lbs spring), The other is a PTFE flapper valve. Yeah- I'm not sure if the PTFE flapper could handle the vacuum or not.

This is what I've done it's in place of my oil filler neck on Driver Valve cover. I also use a "mini" DS oil tank for a AOS vented back to the the main oil tank no problems: http://www.timeattackforums.com/foru...-dry-sump.html

[Sgt.Gator]

This is what I've done it's in place of my oil filler neck on Driver Valve cover. I also use a "mini" DS oil tank for a AOS vented back to the the main oil tank no problems: http://www.timeattackforums.com/foru...-dry-sump.html

Dave,
Thanks for the link. Nice work on saving $$$ for your system. Especially on the hand made dry sump pan! I like yours better than the ARE:

I noticed an "expert" insists that you can't run a two stage scavenge on a Subaru and get enough vacuum because the crankcase positive pressure will overcome it and the heads "must" have their own scavenge stages. <Again!>. I guess Cosworth Engineering never tested that theory, nor did the expert.

Has your regulator ever vented positive pressure? Do you have a vacuum/boost gauge connected to it?


I saw this Subaru powered Radical for sale at Radical USA cars for sale webpage. If you look close in the top pic you'll see the dry sump lines coming off the pump. They are angled forward which is the way the Cosworth pump is setup.



Cosworth pump setups:


Back to the Radical:




Only $65K for a used Radical....

[Sgt.Gator]

I'm betting I could just use this for half the cost.

http://www.summitracing.com/parts/sum-220195b/overview/

Chad the Summit catalog in print version says these are good for 1500 psi and 400 degrees. With a 2 psi cracking pressure, and methanol/chemical resistant. So they probably would work.