oil pump swap

[Tidoubleger24]

i was told by putting in a turbo oil pump inplace of the factory non turbo one, it helps with boosting oil psi at idle and through powerband. ive read and even experienced low to no oil pressure waiting at stop lights. i was informed that the swap made a huge difference. just wanted to let people know..

However i dont know the casting numbers for which pump is which ie turbo vs non turbo, because i have both in stock.. anyone know?

[240ZX]

Dan, this is off the top of my head, but if I recall correctly the turbo oil pump puts out more volume than the stock unit not more pressure. If you do decide to make the change, be sure to follow the proper procedures.....setting the engine at TDC #1 before removing the old unit as well as installing the new unit with the oil pump/distributor drive indexed correctly. Purchase a repair manual if you don't already have one. Oil pressure can be increased via increasing the spring tension on the oil relief valve. Good luck and hope this helps a little.

[sblake01]

And I have also heard that the turbo oil pump uses more hp besides not actually increasing the oil pressure. Your low reading could simply be a bad sender or guage.

[Phred]

To know if you have a turbo pump you must measure the height of the rotors. Externally they are the same, and as there are aftermarket as well as original pumps, the casting # will vary. So get those new digital calipers out and measure the height and you will find one of the following:

Stock Oil Pump - 1.375

Turbo Pump - 1.570

The extra power it takes to turn the larger pump is not worth considering.

Both pumps use the same end housing, and pressure is adjusted with alternate springs, or by shimming the stock spring. If a new pump is installed on an old engine, and it still has low oil pressure, the culprit will be the main bearings. They act as the main restrictor to pressure. Worn out bearings with too much clearance, lets more oil pass through and the stock pump just can't keep up. That is why racing engines that usually have increased clearances, will run a high volume pump with higher pressure capability.

Phred