Originally Posted by Full Force

My buddy got shims from local engine builder...

Originally Posted by 79formula

Do you just hammer out the pin, insert the shim between the spring and pin, and press the pin back in?

Originally Posted by horsepower1

For anyone who might care, here's my take on oil pumps, pressures and volumes. It's all about supplying the engine, mainly bearings, with enough oil to get the job done. There are a lot of factors in this but the biggest one is bearing clearances. Second being what oil you run, and clearances and oil go hand in hand. Engine usage, rpm, HP, oil temp...all play in considering clearances and type of oil. IMO volume and pressure are directly related. If you don't have enough volume to supply enough oil, then you need more volume, not necessarily pressure. This would be basically when bearing clearances are more than standard clearances and a standard volume pump isn't going to do the job. How will you know? It won't make or maintain enough pressure. Increasing pressure in a standard pump without enough volume may or may not solve the problem. Most likely not, so the next step is a high volume pump. Again, you need more oil, not more pressure. What is enough pressure? Lots of "formulas"...the oldest one in the book is 10psi for every 1000 rpm but I know too many pro level engine builders who say that doesn't work. A lot of them rate their oil pressure by HP...10 psi for every 100 hp. but that would mean for a 1200 hp build, you'd need 120 psi of oil pressure and I don't believe that either. IMO, and this is just over years of observation, in most of these sorts of marine apps if you're running a consistent 55-60# hot, WOT, full load and full oil temp, you should never have any issues. Some may like a alittle more just for insurance but remember...it takes HP to turn an oil pump and I'm never one to just throw away free HP. More pressure also increases oil temp @ the pump. To that, run whatever it takes to get whatever pressure you're comfortable with. Stock pump might be fine on a 400 hp 454. 1200hp blown wet sump with added coolers and remote filters will probably take all the oil pump you can throw at it. The more additions you have to the oil system, the more you tax the pump, and the further away these additions are from the pump, the more the pressure drop will be. A good quality pan, good oil drain back, and good, high quality full synthetic oils will also help. Keeping the oil temp under control will help and of course, good general building practices like deburring oil passages, blending entrances and exits, proper clearances and making sure the oil system is problem free will all go a long way to keeping oil pressure under control.

Originally Posted by mike tkach

tim,what do you run for bearing clearance?

Originally Posted by mike tkach

dan,imo a mellings 10778 should be all the pump you need.i have not used the pumps you mentioned but borgie used a schuman and we know what it did for him,NOTHING.

Originally Posted by Full Force

mains average .0032-.0035 with a .0040 rear, rods .0025-.0028 average, with Eagle it's all over, you remember the findings when we talked I am sure, I would have used Scat if I knew Eagle was like that at the time..