Power Robbing Windage...?

[20psiofevil]

Is windage and crank case vacuum the same thing? Or is vacuum a byproduct of windage? I understand that a crankshaft spinning at high rpm is moving air inside the pan doing all sorts of crazy stuff. Would one benefit greater from a windage tray or adding a vac canister?

On a side note I hear a proper setup canister is worth .2 on the strip? Anyone have similar results?

 

[Nick Micale]

If you plan to spin your engine to 7- 8 thousand or more RPM, you will never see an improvement any where near a .2 tenths?

When you get to 700 HP or so, you may see a slight improvement at the track.

A proper evac system with a real pump will cost you close to $1k to do it right.

 

[turbodave231]

Nick's advice is solid. The average street car won't get any HP benefit from a vacuum pump. A good windage tray will help ensure good oiling at higher RPM. The stock pan has a windage tray of sorts welded in place. Improvements can and have been made to this design.

Now, having said all of the above, here is my experience with a "Vacuum pump" on my S2 race-car. I ran a race only car for many years, I always fought oil leaks. The rear main seal seeped and the valve covers would seep a little too........that was until I installed a "vacuum pump" . Now I did not buy one of the high dollar belt driven units that the Pro racers use. I found a GM AIR pump which is driven by a 12V electric motor. I ran a closed crankcase, No PCV valve, and pulled vacuum through a catch can of my own design to keep oil away from the pump. I turned the pump on using a Hobbs switch at 15 psi boost.

I didn't see any measurable increase in ET or MPH, but I never saw another oil leak!!!!! It didn't cost much to put together, and it STOPPED my oil leaks.

 

[Ttype6]

Nick's advice is solid. The average street car won't get any HP benefit from a vacuum pump. A good windage tray will help ensure good oiling at higher RPM. The stock pan has a windage tray of sorts welded in place. Improvements can and have been made to this design.

Now, having said all of the above, here is my experience with a "Vacuum pump" on my S2 race-car. I ran a race only car for many years, I always fought oil leaks. The rear main seal seeped and the valve covers would seep a little too........that was until I installed a "vacuum pump" . Now I did not buy one of the high dollar belt driven units that the Pro racers use. I found a GM AIR pump which is driven by a 12V electric motor. I ran a closed crankcase, No PCV valve, and pulled vacuum through a catch can of my own design to keep oil away from the pump. I turned the pump on using a Hobbs switch at 15 psi boost.

I didn't see any measurable increase in ET or MPH, but I never saw another oil leak!!!!! It didn't cost much to put together, and it STOPPED my oil leaks.

Did you pull a vacuum on the crankcase from the engine's vacuum when the pump wasn't on?

 

[dynoman]

Is windage and crank case vacuum the same thing? Or is vacuum a byproduct of windage? I understand that a crankshaft spinning at high rpm is moving air inside the pan doing all sorts of crazy stuff. Would one benefit greater from a windage tray or adding a vac canister?

On a side note I hear a proper setup canister is worth .2 on the strip? Anyone have similar results?

Here is a good article on windage trays .


http://garage.grumpysperformance.com/index.php?threads/whats-a-windage-tray-do.64/

 

[turbodave231]

No PCV so no. Race cars don't idle much. Catch can kept things tidy at everything less than 15psi boost.

Sent from my XT1254 using Tapatalk

 

[earlbrown]

Is windage and crank case vacuum the same thing?

No. Windage is oil flying around all over the place and potentially airaiting your oil. Crankcase vacuum is when you have a pump to suck out the pressure (and them some) so weak ass rings can still seal.


On a normal TR with normal rings, you really need neither most of the time. These engines don;t spin that fast, and if you have a pressurized crankcase, there's normally a problem as the reason.