Join Date: Mar 2002
Thanked 0 Times in 0 Posts
Re: High volume oil pump for 4.0L
No wonder the chrysler engines wear out so fast -- 12-15 psi at idle is terrible. I bet they would last forever with a nice constant 50 psi (not high pressure -- that is close to the relief pressure of the stock pump.) People swap out engines every 2 years because they are slap worn out after 20,000 miles of 5 psi oil pressure. I wonder if that is what the typical "Jeep Rattle" is from? Fords and Chevy's only do that when they are really low on oil.
I am used to vehicles where the oil pressure just stays rock solid at whatever pressure it is supposed to be (toyotas.) I get kinda nervous when I see them just start dropping off. Engine rebuilds are expensive, and an oil pump costs nothing compared to one. As for fuel milage, I am sure it is not even 1mpg difference with the higher volume pumps.
I was looking for a source to find those pumps. I tried Jegs and Summits websites but they were really not too helpful. I guess I should just give them a call. Any brands that I should look for? I would trust Mopar, and I know Melling too, and you mentioned QualCast but I have not heard of many others. Any suggestions?
Where did you find the extra capacity for the 9.5 (or so) quarts? Was it some sort of deep sump oil pan? I know my oil pan hangs down pretty low as it is. I am not sure I would give up another 2" for an extra quart or two of oil. I would love to be able to run the extra oil in the system. I really don't care about a couple of extra quarts at oil change, but the engine would last worlds longer with oil that stays 20 degrees cooler.