Oil recommendations

[zrayr]

Originally Posted by bobcowan

too much pressure for a SBF. It takes a lot of energy to make that much pressure - wasted energy. And it puts a lot of strain on the drive shaft. You run a high risk of shearing the pin on the drive gear.

The pin shearing is one of the oldest old wives tales. When a pin shears it's because something jammed the oil pump gears. Period.

As far as wasted energy, at 6,000 rpm I was down 2.7 HP when I changed to a Melling HV oil pump. I can spare that. As cruisg RPM the different was zero.

I've been building SBF engines for over 45 years, and using the HV pumps for the last 15 years, along with Mobil 1 15w-50, I've been setting up ththe engines for power and reliability for long distance endurance runs. So far I've had zero engine issues. Zero blown engines after running flat out for about 140 miles over and over again is proof enough for me that this combinatin works very very well

Z

[Gaz64]

The pin can shear from the drag the pump offers against rotation.

Usually with thick cold oil run to high rpm too early.

Larger pump with the same driveshaft/pin. Something will give.

[zrayr]

Originally Posted by Gaz64

The pin can shear from the drag the pump offers against rotation.

Usually with thick cold oil run to high rpm too early.

Larger pump with the same driveshaft/pin. Something will give.

Anyone that would give a cold engine full rpm deserves some grief. A little common sense goes a long way, especially where engine longevity is concerned.

Z