Just to go with ROR, I have a 16V (not turbo) and at 2800 rpm I easily get 55-60 psi no problem. I would assume the ratio is slightly higher. Size of gear pumps are the same, but your not feeding a turbo either.
A long time ago, when I was a novice, I didn't (forgot to) add sealant between the piston oil coolers and the block in a 1.6 TD. I had oil pressure issues similar to yours. MY $.02.
Okay the verdict is in, the ratio of IM shaft vs. oil pump is 1:1. Of course since the IM shaft is driven by the back of the belt there will be a small (very small) amount of slip but that doesn't count.
So your drill running the oil pump was equivalent to 2200 crankshaft rpm.
I'd check the bolts and while you're in there take a look at the piston squirters and also make sure the oil pump screen is clear of goop.
I'll let you guys continue your ratio debate, and just quietly sneak in the fact that the bolt holding my intermediate shaft pulley on had worked loose and the pulley was slipping on the IM shaft. Would've had just enough friction to make 20psi at just about any rpm for a while which is what kinda threw me off
But please, carry on! My vote is that the IM pulley is twice the dia of the crank pulley and that the IM gear is very similar in size to the vacuum pump gear, leaving an overall ratio of 2:1.
Wait. The IM pully is keyed. Is there a key in the pully still?
yeah, the pulley should have a keyway keeping it from spinning regardless of how tight the bolt is( would have to fall off to disengage from the shaft and spin freely)
-Owen
dang.. uh.. I'd better find myself a key for that pulley...
I was wondering about that, thinking it should need a key. Must have missed it during assembly.
Is it a square or half moon key?
IIRC I think the IP pulley is a piece of keystock *square* and the IP has the woodruff key *half moon* as soon as you pull it off you should be able to see clearly though.
I just looked at my turned down IM shaft pic and to me it looks like it is a half moon woodruff key on it. So I was incorrect before.
Okay the verdict is in, the ratio of IM shaft vs. oil pump is 1:1.
Of course, in your case it was variable
Good save by RadioTD, my other half would have kept going, red lights, buzzers, regardless, at least till seizure.