Pan Evacuation System on Road Car???

**Duk** · 07-01-2011, 06:01 PM

I was going to install a Moroso vacuum pump on my twincharged GZE AW11, but the reality of actually doing it, is/was another story.

It was suggested to me to use a pan evacuation system before I even bought the pump by a guy who uses 1 on his blown Ford engined drag car.

Obviously not a road legal thing to have, but has anybody used a pan evacuation system on a road car?

**andrew_mx83** · 09-01-2011, 05:38 PM

what are you trying to achieve? crankcase vacuum or proper dry sump?

**Duk** · 10-01-2011, 11:16 AM

Just want to help get the crank case gases out much better that by having to puff through the little K&N filter I use on the standard breather.
Theory being that if a pan evac system can cause enough of a pressure drop then the gases will have an easier time of getting out and much less chance causing leaks and restricting oil flowing out of the turbo back to the sump (not much angle there, damn near horizontal, but it's 1.75" diameter

).

**MWP** · 10-01-2011, 01:46 PM

None of the above are good reasons for running a crankcase pump.
Its extra weight, parts, complexity & cost when you dont really need it.

**Dangerous Beans** · 10-01-2011, 02:55 PM

Lower crankcase pressure does give you lower friction losses and better piston ring sealing. So there is some power there. Whether or not you can be bothered is a different question.

I am thinking about running one, it seems worth while for fuel economy and performance reasons, but it is way down the list of things to buy/build. Like Dub said it may well be illegal for street use, so you may want make sure you can undo it easily.

**MWP** · 10-01-2011, 03:07 PM

I know it gives small performance increases, but didnt know it also gave fuel economy increases.
How does it do that?
I would have though it would be the opposite since you need some power to run the pump.

**Dangerous Beans** · 10-01-2011, 03:27 PM

the performance increase comes from the reduced drag on the engine internals, thus reducing the amount of fuel required to keep the engine ticking over.
I imagine that it the drag on the engine internals would also be higher for a given rpm at low throttle openings, because of the pressure differential between the combustion chamber and the crank case.
I will dig up some more info when i get home.

**Duk** · 10-01-2011, 03:34 PM

Originally Posted by MWP

None of the above are good reasons for running a crankcase pump.
Its extra weight, parts, complexity & cost when you dont really need it.

Maybe, but the crankcase ventilation system is trying to let out the blow by of a less than new motor swallowing about 18 psi worth of wind, it is far from ideal.

**MWP** · 10-01-2011, 06:38 PM

Originally Posted by Duk

Maybe, but the crankcase ventilation system is trying to let out the blow by of a less than new motor swallowing about 18 psi worth of wind, it is far from ideal.

Ok, but old factory turbo engines dont need an evac pump do they?
Im just saying you dont *need* one, and installing one is probably a waste of $$s.

**andrew_mx83** · 10-01-2011, 06:40 PM

try a diesel vac pump hooked up to the block to rocker cover breather (if ur motor has one).... or suck it back into the inlet pre-turbo

yes it will make the motor more efficient due to lower pumping losses, but you get nothing for nothing and as has been mentioned you will lose hp driving the pump

i am very much looking forward to negative crankcase pressure with my dry sump setup!!