From what I've seen, you don't want to go over 250whp or 7500 rpm on the stock pump. I know that is not the absolute limit, and some people have gotten lucky.

The real difference between the stock units and a forged unit is the amount of porosity in the stock unit. I have uploaded the picture. The thing that looks like a sponge is sintered steel. So if that sponge has any deformities it will break easily. If you've managed to get one that is "well done" then it should hold up ok.

If you look at the forged steel you'll notice the increase in density, no pores. If you weigh our gears and the stock gears ours are actually heavier despite being made out of materials that have the same density. This is one of the reasons the forged product is superior.

I can't tell you where the line is, but you'll find out quickly if you exceed the limits of the stock pump.

Travis

metallurgy ftw! thats some good close up pr0n

and sorry i never got in on the gb, im saving up for my turbo... but i will still buy one when it comes time to start buyin shitz for the block

http://boundaryengineering.com/drupal/node/7 <- Product line has been officially changed!

http://boundaryengineering.com/drupal/node/130 <- New 1991.5-00 Billet Oil Pump Assembly!

Hi , do you have a group buy going at present on a 'stock replacement billit gear oil pump [1990.5 ] if yes can you sign me up . I can pay in advance if required !! and of course what is the price ? cheers max. maxspring@aapt.net.au