Too much oil pressure???
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Too much oil pressure??? Here is my question, I bought a new mellings oil pump that is supposed to have 18% more oil volume and pressure. It came with an extra spring for lower oil pressure. Can you have too much oil pressure and what adverse effects can it cause? It seems to me that most issues people have are from low pressure and or volume which causes noisy valve trains and spun bearings. So with my forged bottom end, wouldn't I want more volume and oil pressure???
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Originally Posted by 98Grnz28
More oil pressure want hurt. I know some one who had that pump and it held the same oil pressure as my stock one.
Actually yes a pump with too much pressure and volume will cause the sump to run dry at sustained high rpm and the oil will all be up in the valve covers rather then where it needs to be unless you plumb some sort of faster return lines for it. If you look at alot of race engines they have braided lines going from the valve covers to the pan to prevent this. I'm not sure if an ls1 would have the same problem but i'd imagine if the pressure was way high then it would. Oil systems are all about controling the oil not putting the biggest freakin pump in there you can find. Haveing said that i'm sure your setup will be fine. But to answer the question yes too much oil pressure can be bad.
Originally Posted by 98Grnz28
You should not run out of oil. Ls1 oil pans are fairly large. Yes, the high volume is the one he used. He has a 402 and it holds the same oil pressure as my cammed LS1.
Mine holds 5.5 quarts like almost every other v-8. I was simply answering his question of can you go too big with oil pressure which is yes.
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I just wanted to make sure that the High volume pump with the high pressure spring would be ok. I noticed my oil pressure is lower with the 408 probably due to clearances and wanted to use a better pump to supply enough oil to eliminate any oiling issues. I do appreciate the feedback.
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Originally Posted by Y2K Z28
Mine holds 5.5 quarts like almost every other v-8. I was simply answering his question of can you go too big with oil pressure which is yes.
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I have that pump on my forged bottom end 347. With the higher pressure spring i get 70psi at cold start up and 30psi at a hot idle. Alot depends on the thickness of the oil,bearing clearance and seating the O ring properly. I also would change out the oil pressure sending unit as well so you will have a more accurate reading.
