Moroso tests vacuum pumps, oil pans, oil pumps

[rcodecj]

Cheby, but still interesting results:

http://www.429-460.com/t13910-moroso-tests-about-power-with-and-without-vacum-pumpseavc-kit-bigger-oil-pan-oil-pressure-ect-very-interesting-check-it-out

[jayb]

That is a very interesting article, and it is surprising how much power they picked up with an oil pan change, and how much they lost going to the high volume pump.  I think that the HP gains from pan changes are much more muted on an FE, because of the extended skirt block; a normal engine without the extended skirt is able to use the windage tray to strip away oil around 180 degrees of the crank rotation, while the FE's block design limits this to about 90 degrees.  Not to say that gains can't be had using the right pan, but I doubt that they would be that large.  Fodder for a future dyno test of my own, maybe...

[cammerfe]

Roush has a limited-admission room in his Livonia main building that does nothing but experiment with subtle changes in the oiling system on the NASCAR engine. He told me that he believed there to be more power to be found there than any other part of the engine.

KS

[babybolt]

The Chevy LS aluminum blocks have a window in the main bearing bulkheads which supposedly allow the pressure pulses from the pistons to interchange between bulkheads.  They even advertised that they had mildly modified these windows on the later blocks for better results.  Apparently lots of dyno time, can't see how any CFD or computer software could come close to simulating this complex flow/pressure dynamics, except as a rough approximation. 

Way back in the day the Olds 403 had windowed main bulkheads but the windows were nearer the crank.  I never understood why they did that except maybe they had an early understanding of the pressure pulse relief idea, can't believe it would be for weight savings.  I saw a 403 laying in a junkyard one time with the mains torn out right at the windows.

[Heo]

I dont know the purpose with it but on some kind of
Lincoln prototype engine i installed in a Pantera
a long time ago. There was some strange chambers
on the side of the oilpan. The owner told me they
were there to level out the pulses in the crankcase
and suposed to give some extra hp
This was a 4 valve engine looking much like the new
modular V8 but this was several years before it came out in a car
I dont know how the pan on the regular production
modular engine is
Maby not directly related to this i just rememebered
when i read this