oil pressure...
11-09-2006, 10:10 PM
#16
5th Gear Member
Join Date: Feb 2006
Location:
Posts: 3,768
RE: oil pressure...
I did some internet research in the aim of ascertaining the factory oil pressure spec for a new 5.0 engine, but was unsuccessful. I did however get the impression that, for cars in general, typical oil pressures range from 20-40 psi at normal idle speeds, and 40-80 above idle. Take it for what it's worth.
11-09-2006, 10:21 PM
#17
6th Gear Member
Join Date: Dec 2003
Location: cape giradeau,mo
Posts: 8,872
RE: oil pressure...
Oil Pumps are your engines lifeline and need to be treated as such. 99% of people just throw in a store bought pump in thier engine and away they go. That's a surefire way to get into alot of trouble. You spend 1000's of dollars on cranks, rods, pistons etc. then dump a 30 dollar sealed power oil pump in the motor. Shame on you.
Oil pumps are gear pumps or gearotor pumps, both are positive displacement pumps and use a relief valve which by-passes oil back to the suction side when pressure is beyond a set limit. I have seen many off the shelf pumps come with a stuck relief valve, or a bad relief spring.
Typically what happens is the gears become worn or sloppy machining tolerances let oil slip by the edges of the gears and not pressurizing the oiling system. Imagine that scenario at 6000rpm when your engine needs the oil most.
Here's another misfortune I have seen many times, guy has oiling problems, ends up tearing up a bearing or two, we take the motor down and low and behold one of the 4 bolts that hold the gear plate on is laying in the oil pan, now he knows why oil pressure is non existant and he has to rebuild the bottom end.
There is alot more to an oil pump than people even think about. Fortunately for you guys, my dear friends here at ******** I will be selling some blueprinted oil pumps for the small fords that I do myself. No I won't be buying someone elses blueprinted pumps and sending them to you, cause frankly I really don't trust anyone but myself, especially when we are talking about oil, which we all know is essential.
Oil pumps are gear pumps or gearotor pumps, both are positive displacement pumps and use a relief valve which by-passes oil back to the suction side when pressure is beyond a set limit. I have seen many off the shelf pumps come with a stuck relief valve, or a bad relief spring.
Typically what happens is the gears become worn or sloppy machining tolerances let oil slip by the edges of the gears and not pressurizing the oiling system. Imagine that scenario at 6000rpm when your engine needs the oil most.
Here's another misfortune I have seen many times, guy has oiling problems, ends up tearing up a bearing or two, we take the motor down and low and behold one of the 4 bolts that hold the gear plate on is laying in the oil pan, now he knows why oil pressure is non existant and he has to rebuild the bottom end.
There is alot more to an oil pump than people even think about. Fortunately for you guys, my dear friends here at ******** I will be selling some blueprinted oil pumps for the small fords that I do myself. No I won't be buying someone elses blueprinted pumps and sending them to you, cause frankly I really don't trust anyone but myself, especially when we are talking about oil, which we all know is essential.
11-09-2006, 10:44 PM
#18
I ♥ Acer
Join Date: Apr 2006
Location:
Posts: 5,116
RE: oil pressure...
your ALWAYS wrong
ORIGINAL: grabbem88
for every 1k of rpm you need atleast 8-10 psi of oil pressure....i'm not touching the explanation of oil pressure and what not...since everybody said i was wrong...
for every 1k of rpm you need atleast 8-10 psi of oil pressure....i'm not touching the explanation of oil pressure and what not...since everybody said i was wrong...
11-09-2006, 10:54 PM
#20
I ♥ Acer
Join Date: Apr 2006
Location:
Posts: 5,116
RE: oil pressure...
I did.....I'll admit about the clearancing the oil pump it's amazing how many new one I throw away that are so crappy I would never put one in an engine...but if you want to do the right thing than EVERY HIGH $$$$ NEEDS AN OIL PRIMER to 15 psi before car can start!!!! with a dual filter setup