[tom s]

Guys,when the factory used a 80lb pump the used a cam with a smaller gear and used a larger gear on the dist.Engineers do thing for a reason!That was with a iron gear also.Tom

[Steve C.]

Although street only no issues with about 5200 miles. BOP gear and 80 psi pump, engine made peak power on the dyno at 5900/6000 rpm. Can anyone provide actual real world comparison data between the two regarding power (stress) to turn a 80 psi pump ?

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[Steve C.]

I understand this is the 'race' section, but for interest I found this....

Common hobbyist concerns when using an 80-psi oil pump in a street engine include excessive parasitic loss, bearing wash, and premature distributor and/or cam gear wear. “We’ve never seen a noticeable performance loss from the added load,” says Butler. “Racers will sometimes run a 60-psi pump to reduce parasitic drag and free up a few horsepower. While that’s acceptable in a dedicated race engine that’s frequently torn down, it’s certainly not something we recommend for all engines.”
He continues: “We’ve run as much as 100-psi on some engines and have never experienced any bearing wash issues. Excessive distributor or cam gear wear can result, particularly with a bronze gear, but we consider positive cam-gear oiling a must when running a roller camshaft, and we found that it significantly improves distributor gear life.”

One area that many hobbyists overlook when selecting an oil pump for a particular engine is camshaft type. “Some of the aggressive hydraulic- roller-lobe profiles available today and the high-pressure valvesprings required to effectively maintain valvetrain stability can cause the roller lifter’s hydraulic internals to bleed down too quickly, and that can create a performance loss. In these instances, additional pressure (75 psi or more) is required to keep the hydraulic lifters working properly,” states Butler.

http://www.hotrod.com/how-to/engine/...-observations/


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