Bigger oil gallery

SWR · Post by **SWR** » Thu Jun 15, 2006 10:18 am

Anyone seeing any issues with machining the main oil gallery of a block bigger? I have an engine with some oiling problems to a specific rod and it's basically an oil volume problem,not pressure...so I'm thinking about increasing the volume available in the main gallery (it's just over 3/8" dia at the narrowest point,in the middle of the gallery) and probably port the junctions to increase volume flow. Issues?

highVE · Post by **highVE** » Thu Jun 15, 2006 7:50 pm

I know it was commen practice opening up the main oil galleys in a stock SB chevy block to .500" years ago. I've never done it, but i've seen it. And know there were no issues as far as problems.

Mike

SWR · Post by **SWR** » Thu Jun 15, 2006 7:57 pm

Thanks Mike

Do you know if the reason for doing so was to get rid of bearing issues due to oil volume being too low,like in my application? Why did they stop doing so (or is it still done on hi-perf engines)?

C Stevens · Post by **C Stevens** » Thu Jun 15, 2006 11:30 pm

Back "in the day", I used to open up all the passages in center oiler FE engines. The reasoning was to slow down the flow so the oil could make all the convoluted turns in that system. Seemed to work well...back then.

tweaks · Post by **tweaks** » Fri Jun 16, 2006 4:55 am

What motor are you working on...suggest you look at machining out pump body / housing and fitting larger gears in pump to increase capacity of oil as well as opening up that critical area..

SWR · Post by **SWR** » Sun Jun 18, 2006 6:30 pm

tweaks wrote:What motor are you working on...suggest you look at machining out pump body / housing and fitting larger gears in pump to increase capacity of oil as well as opening up that critical area..

Porsche 944 Turbo... there's a pic at my "oil pump cavitation"-thread now. viewtopic.php?t=3170 ... Not much room to make anything bigger there...