Whats this I hear about aftermarket oil pumps sucking?

Seen a couple of posts about them sucking the pan dry and other horror stories killing new motors. Hows this so? High pressure or high volume versions?

Everyone seems to be recommending a stock pump with a GMPP white springs. Why that over a high pressure pump (IM guessing its the high volume that sucks them dry)

Originally posted by LTOne4Fun
Seen a couple of posts about them sucking the pan dry and other horror stories killing new motors. Hows this so? High pressure or high volume versions?



if you use a high volume pump with a stock capacity pan it *can* possibly pump too much oil up to the valvetrain and not keep enough oil in the sump for the bottom end. The solution is to buy a pan with more quart capacity. I had to do this

Originally posted by LTOne4Fun
Seen a couple of posts about them sucking the pan dry and other horror stories killing new motors. Hows this so? High pressure or high volume versions?

Everyone seems to be recommending a stock pump with a GMPP white springs. Why that over a high pressure pump (IM guessing its the high volume that sucks them dry)

Some confusion in your post. If you add a higher pressure spring to a stock pump, you have in effect created a "high pressure pump". A high pressure pump is not a high volume pump. They are two different things. The only way you can increase the volume pumped at any given RPM is to increase the body size of the pump.

I understadn that, but peopel werent specific when they said "my melling pump caused my motor to blow up, Id say get a stocker with whitesprings". Now, i will be running a stock pan, I could prolly weld in soem baffling, but assuming i dont, would a Melling Hihg Pressure (not volume) be ok wiht it? Is therre any reason why I shoudl choose a stock GM with white springs over one of those?

Some of the wildest 1/4-mile LT1's that I'm familiar with use(d) the stock pan with windage tray, and stock pump with a high pressure spring, including George Baxter's 1,125HP monster....... That combo has also worked for me, although I'm a little shy on the HP department, making about 30% less that he had.......

I figure if it works and its cheap, why change it..... :D

I"m spectical too, I think most of these stories came from being a quart or 2 low to begain with.

do lt1 comes with a windage tray? if not what oen are you all using

LT1's do come with a windage tray....atleast my 96 did. Its just a flat piece of metal. SStrokerAce and I have been thinking about an aftermarket one for my motor so Ill be interested to see if people like them or not...