Cobra Make, Engine: Street Beasts w/302 Twin Turbocharged....Under Construction!!
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High Volume Oil Pump?????
I'm getting ready to put my engine together, as soon as the cam gets here, and now you guys tell me "NOT" to use a high volume oil pump. I purchased a Melling HV pump to use on my 302, bored 30 over, with an E303 cam, moderately stock heads (heavier springs and rolloer rockers), and a Garrett T4 turbo......so, I guess I should go back to a normal Melling oil pump??????????????????????
Cobra Make, Engine: ERA 427SC w/427so, ERA GT #2002
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Unless your engine has extremely wide oil clearances, that's what I would do.
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"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough HORSEPOWER." Mark Donohue
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Cobra Make, Engine: 66 COBRA FE 427 /4SP. (HCS Coupe w/ 408 Stroker and TKO 600 -sold)
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You are ok with an HV!
I built my 302 almost exactly the way you did. I had a little more work done on my heads but I installed the HV pump and I kept my engine in my Cobra for two years and raced it the second.
When I decided to go to a BB I had over 5000 miles on the engine. I pulled my 302 and examined all the bearings, ring clearance, etc. The engine looked virtually new except for some carbon build from running my carb too rich.
I assume you went with the 1.7 ratio roller rockers and a roller cam? I also assume you have changed out your distributor gear. I used a MSD "Ready to Run" distributor for the SB Ford engine and I really liked it.
I think you will be ok!
Clois
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If you built the engine w/ stock type clearances... use the stock melling pump. It's a whopping $17 at autozone. 302's have a tendency to have distributor gear and oil pump driveshaft problems w/ HV or HP pumps.
I BUILD A 5.0 STOCK BOTTOM END AND ALL THE HOLLEY STUFF ON TOP. I INSTALLED A HV MELLING OIL PUMP. WHEN I CRANKED THE ENGINE I HAD 95 LBS OF OIL PRESSURE. DROVE THE COBRA FOR A FEW HUNDRED MILES. ONE DAY I WAS SHOWING MY BROTHER WHAT THE OLD COBRA WOULD DO AND BLEW THE O RING ON THE OIL FILTER. TWO AND ONE HALF QTS OF OIL ON THE MOTOR , WINDSHIELD AND MY HAIR, SOME ON HIS WHITE SHIRT. I CALLED FORD MOTORSPORT AND THE TEC TOLD ME NO ONE SHOULD USE A HIGH VOLUME PUMP ON A MOTOR WITH STOCK ( TIGHT) CLEARANCE. HE SAID HV PUMPS SHOULD BE USED ON OLD MOTOR ( WORE OUT) OR RACE ENGINES WITH LOOSE CLEARANCES. I CHANGED TO A STOCK VOLUME MELLING PUMP. PRESSURE IS NOW 55 TO 60.
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Earl:
High volume oil pumps mean higher pressure. There is such a thing as too much pressure. Excessive pressure is of no value to rings, bearings and cams, but it will move seals. Be careful.
If you insist on the HV pump, consider 5W-30 synthetic, avoid the 20W-50 stuff.
Do a search on "distributor gear", and you'll find a lot of discussion about distributor gear failures due to the use of high volume oil pumps with stock clearances.
Go with the stock oil pump. I was using a HV and an ARP oil pump rod and with 3000 miles on the engine, the distributor gear came apart and took the cam with it. One of the teeth from the distributor jammed in the oil pump causing the cam and finished off the dist. gear. Everything was trapped in the filter and oil pan. Ford Motorsport confirmed what I suspected and told me to use the standard pump.
The only bad thing about this event was that I was on my way to the Super Chevy show and took a lot ribbing about how I should put a rat motor in my Cobra.
Cobra Make, Engine: I used to fix them for a living
Posts: 2,563
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Quote:
Originally posted by Bob In Ct
Earl:
High volume oil pumps mean higher pressure. There is such a thing as too much pressure. Excessive pressure is of no value to rings, bearings and cams, but it will move seals. Be careful.
If you insist on the HV pump, consider 5W-30 synthetic, avoid the 20W-50 stuff.
Bob
Wrong. Maximum Pressure is determined by the spring in the bypass valve. Ford spent a fortune developing the oiling system in their motors. Unless you have opened up all the bearing clearances, or know more than ford's engineers, stick with the regular volume pump. All the extra volume just gets spit out the bypass valve in the pump anyhow.
High Volume Oil Pump?????
302's have a tendency to have distributor gear and 
Linear Mode
