440 Charger
Well-Known Member
75 is my goal psi.
I would say no a melling hv is a good pump and its the spring you do for the pressure.
75 is my goal psi.
so is 75 too much?I like 25 at a warm idle, and 45-50 down the road after it reaches relief spring setting. My bracket engines run more.
Very true but you wont starve on oil.30% more than necessary.
I like 75 going down track in a drag motor, but I do have a deep seven quart pan and hv pump. 75 is more than enough for a street car, probably a little too much. My definition of TOO much pressure? When you whack the throttle on a cold motor with no choke..... and you peg a 100 lb gauge, and blow the oil filter off the motor. Ask me how I know.......so is 75 too much?
If you have sufficient pressure with a stock pump, going to a HV will yield nothing other than putting a strain on the pump drive shaft and gear and using up horsepower.
Less than .oo2To me, choice of pump volume and pressure is determined by lower end clearances. 2 and 2 (or less), stock pump. Worn out stock, maybe a normal pressure/high volume. 3 and 3, and needing a good supply of oil in the top end for high spring pressures, hv/hp all the way, (with a good oil pan too, of course. )
Too much lower end clearance, no pump will give decent pressure.
This is going to be fun for me now .Run what you need. I would not run a HV pump until I determined that the std volume pump would not maintain idle oil pressure at of above 15 psi.
My last two motors have std volume pumps with high pressure springs. idle about 20 psi, off idle and cruise is about 40, about 70 WOT. Both motors have full time rocker oiling. Use 10w30 synthetic.
I suspect the lifter clearance, which you normally don't have control over, will have a bigger impact on idle oil pressure than just about anything else.
So is oil pressure a bad thing at idel most say 20 should be a low ballI'm no physicist, but every vehicle I have runs about 30-40 warm at cruising speeds. Cummins diesel, air cooled 750 4 cylinder, 1250 V-twin, 1400 liquid cooled 4 cylinder, 496 V8, 350 V8, only 1 exception, 4 valve 4.6 V8 turbo jet boat, it is "Always" under load n cruising at 4k+ rpm, it runs 60-70 warm at 4k, but when I idle through no-wake zone it goes down to 15-20psi. There is absolutely no need for anything over 40 cruising. Pressure means there's oil and tolerances aren't too loose for the most part. Everyone's fascination w "hi volume" "hi pressure" in a "hi performance" engine.
Its just my thing to figure out man it may work or it will not.I'm no physicist, but every vehicle I have runs about 30-40 warm at cruising speeds. Cummins diesel, air cooled 750 4 cylinder, 1250 V-twin, 1400 liquid cooled 4 cylinder, 496 V8, 350 V8, only 1 exception, 4 valve 4.6 V8 turbo jet boat, it is "Always" under load n cruising at 4k+ rpm, it runs 60-70 warm at 4k, but when I idle through no-wake zone it goes down to 15-20psi. There is absolutely no need for anything over 40 cruising. Pressure means there's oil and tolerances aren't too loose for the most part. Everyone's fascination w "hi volume" "hi pressure" in a "hi performance" engine.
Old hydraulic things thank you as always.There is an adjustable pressure device, made my milodon i think, that replaces the plug that holds the relief spring on a big block pump. It will NOT adjust idle pressure, (unless you have too much, which is highly unlikely) but it will allow you to adjust going-down-the-road pressure to what you want. Basically its just a movable stop for the relief spring, held in place with a locknut.
If you use one, be careful that you dont set it too tight. Remember how i defined too much pressure? An oops with the adjustment clarified what too much pressure is.
Remember some of us re define in time if that make sense to you but thank you very much>There is an adjustable pressure device, made my milodon i think, that replaces the plug that holds the relief spring on a big block pump. It will NOT adjust idle pressure, (unless you have too much, which is highly unlikely) but it will allow you to adjust going-down-the-road pressure to what you want. Basically its just a movable stop for the relief spring, held in place with a locknut.
If you use one, be careful that you dont set it too tight. Remember how i defined too much pressure? An oops with the adjustment clarified what too much pressure is.