Oil system plumbing

[MeatMan]

Hey All, I'm working on a Ross Gibson engine and I'm trying to figure out the oil system plumbing. I've studied a lot of photos and diagrams and I think I have it. Please check out the diagram and give me your input, thanks.

[Ace-Garageguy]

Looks right to me.

Scavenge lines from the pan go to the multi-section scavenge side of the pump.

Scavenge output goes to the top of the dry-sump tank for de-aeration.

De-aerated oil from the bottom of the dry-sump tank flows to the pressure-side of the pump.

From the pressure side of the pump to the filter, and on to the oil galleries in the engine itself.

Note: If you run a cooler, it would be between the pressure side of the pump and the filter, possibly with a thermostatically-controlled bypass)

Used oil drops into the pan, and is scavenged again.

All of that is appropriate for any dry-sump system for any kind of racing.

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As far as the crankcase breather setup, I'm not entirely familiar with what's considered best practice these days. I'd tend to think the connection from the oil/air separator tank ("breather tank") would be lower on that tank than where your diagram has it. I know some systems don't drain into the sump-tank, but have a drain with a manual valve on the breather tank.

Also, many dry-sump tanks incorporate some kind of integral breather tank, so a separate unit for the crankcase evac system may not be necessary.

Real racers with more recent experience than I have, please chime in.

Edited October 13, 2014 by Ace-Garageguy

[Force]

Many racers use a belt driven vacuum pump on race engines today and that's what's shown here, the "crankcase evac pump" is infact this vacuum pump wich draws the crankcase gases out through the valve covers and creates a vacuum in the crankcase, the gases are released into the breather tank and vented out.

There are many advantages with this system, the engine runs easier with vacuum in the crankcase, the piston rings seals better so it'll get you more horsepower, some racers even have two vacuum pumps where one pump is used just under the race and are battery powered, the other is belt driven, an engine with crankcase vacuum also seals better and woun't leak.

Edited October 13, 2014 by Force

[MeatMan]

Wow, thanks guys. I wasn't familiar with how it all worked together. Ace Garageguy, thanks for the lesson on how it all works. The pump is part of the kit so I'm just plumbing it in. I've seen a couple of these where guys just ignored the pump like it didn't exist and I didn't want to do that.