padam
Well-Known Member
I agree.
I can easily get 80 psi priming my pump with a cordless drill.
Oil pump question
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I can easily get 80 psi priming my pump with a cordless drill.
65CopCar
Well-Known Member
And the performance oil pump drives vs stock are heat treated and have a very generous radius to reduce stress risers because?????????
65CopCar
Well-Known Member
Ever watch an oil sight glass for a sleeve bearing where you increase flow and pressure and all of a sudden it starts foaming? I have. No foaming at lower flow and pressure. Does the same thing happen inside an engine? How do you know? Like I said, talk to a tribologist if you want to get into the nitty gritty details of proper oil flow, pressure, viscosity, oil film, etc. I am not a tribologist, but I know a couple of very good ones that I talk to and learn what I can from them.
Through years and and years of experience good guidelines have been established. That includes minimum and maximum oil pressures.
Ever blow out a filter seal? I did when my pressure relief was set too high - the adjustable relief was flaky. It blew out around 100 psi. Think out of the box what stresses and unintended consequences happen when the pressure is higher than it needs to be.
And back to the pump drive. What causes it to fail?. Usually torsional stresses caused by harmonics. What are the harmonics in the drive? How do they change with higher pressures and flows? Those pumps cause nasty harmonics.
I just cannot at face value accept the answer that higher pressure is better................
Through years and and years of experience good guidelines have been established. That includes minimum and maximum oil pressures.
Ever blow out a filter seal? I did when my pressure relief was set too high - the adjustable relief was flaky. It blew out around 100 psi. Think out of the box what stresses and unintended consequences happen when the pressure is higher than it needs to be.
And back to the pump drive. What causes it to fail?. Usually torsional stresses caused by harmonics. What are the harmonics in the drive? How do they change with higher pressures and flows? Those pumps cause nasty harmonics.
I just cannot at face value accept the answer that higher pressure is better................
js29u
New Member
My 440 has about 20 hot idle in gear with full groove mains. I have the hi volume 63 mellings so i tried a new standard mellings with a hi psi spring and still 20 psi. I think one time letting off at 130 +mph, i saw the oil gauge jump instantanly up from 0. It must have sucked dry. But everyday heading down rt 6 in cape cod i would bring it up to 130-140 for a few seconds. But not anymore up in weeki wachee. A boring place.
padam
Well-Known Member
Even a stock one is pretty stout compared to a SBC with the plastic sleeve.
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Does ths guy also walk on water??? Must be indigenous to your location..never heard of this person b4...please provide some info...web site?
BOB RENTON
65CopCar
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Do you know who Lake Speed Jr. is? He is a tribologist and one of the interviewers.......
Episode 53 – Engine Builder Interview: Tony Bischoff | Engine Performance Expo
For the final engine builder interview of the 2022 Expo, Joe and Lake sit down with the Horsepower King, Tony Bischoff of BES Racing Engines
engineperformanceexpo.com
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No clue.....also, don't care either...but....I'm a proponent of the hydrodynamic philosophy of the oil film theory......and i believe that the greater the oil's hydrodyanamic wedge, the better.....but design the drive to support the maximum torsional loads at maximum rpms ......but this is just my philosophy......regardless of what you believe or think or proclaim .......I'll stay with what works for me......and no...I don't study the effects of journal bearings and their lubricant supply.....but could be a function of the shaft rpm, shaft diameter, journal area, journal material, volume, viscosity and chemistry of the lubricant, operating temperatures......just my thoughts.......
BOBRENTON.
furyus
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Hey, I live in Weeki Wachee!
Your post tells me what I needed. I was wondering if a high pressure pump would make a difference. I brought up the idle a little, reset timing. It seems good.
Geoff 2
Well-Known Member
The reason the stock pump drives fail is twofold:
- there is a sharp edge, a stress riser, where the hex meets the main shaft
- the steel is too hard, like that used to make drill bits. it will not withstand shock/flexing & will break.
The MP & other 'performance' pump drives are made of 4X40 moly steel, a hard steel but with some 'flexibility'. This flexibility, coupled with the tapered end of the hex, allows it to absorb sudden load increases...without snapping off. Be prepared for a warn shaft if using with the stock bronze bush....
- there is a sharp edge, a stress riser, where the hex meets the main shaft
- the steel is too hard, like that used to make drill bits. it will not withstand shock/flexing & will break.
The MP & other 'performance' pump drives are made of 4X40 moly steel, a hard steel but with some 'flexibility'. This flexibility, coupled with the tapered end of the hex, allows it to absorb sudden load increases...without snapping off. Be prepared for a warn shaft if using with the stock bronze bush....
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