Slo_crx1

Ok, so far this is what i've dug up...took my LS pump apart and compared it to a gsr pump my friend had...the spring is the only difference between the 2 pumps. I didn't really see a spacer on the LS pump, only a metal ring to seal the plug in. Maybe the b18b's have the spacer to up the psi a little, but the b18a1 didn't have one. Actually, by the way it's designed, if you add a spacer to the spring, it should increase the spring tension and therefore make it put out a higher psi before it opens the valve. From what i can see of the design, think "granger valve" mbc design. Supposedly though according to my friend and his fellow honda hoodlums, the real deal type-r pump has not only the increased spring rate, but an increased volume as well.

0b00st0

The shim should've been in the VTEC oil pumps. The shim raises oil pressure.

Slo_crx1

Umm...where do you see anything about vtec oil pumps having shims? I think he meant the oil seal ring. And why would they add a shim when all they do is make a different rate spring? We're saying add a shim to the LS pumps to raise up psi.

0b00st0

Someone mearly stated that the LS oil pump had a shim in it. I meant that if the spring rates were the same, then the vtec oil pumps would have the shim to raise oil pressure. I've seen people add shims to VTEC oil pumps to raise pressure as well.

Slo_crx1

Ok...i gotcha. I think he meant the retaining bolt was shimmed down, therefore putting less pressure on the spring than if it was removed.

shanerv

oh for anybody who did't know 96+ plus b18's have a higher flow rate. it is the same as the vtec b's basicly any obd2 b seris pump is the all the same. look at the part numbers.

BoosTedZSix

^^ damn i was about to mention that. and yes all 96+ b series pumps are the same. including b20's.

Tom-Guy

Uh, no.

A broken rod bolt manifests differently from a spun bearing. Sometimes you get a little stretch (before breaking) that causes the edges of the bearing shells to dip inward and grab the crank + spin, but in that case you'd also see a good number of broken LS rod bolts accompanied by good bearing halves hanging out in the oil pan. You don't.

The different torque specs are due to different size rod bolts. Welcome to metallurgy.

I've seen a couple of early ECHC engines, B20B/Z, with stock LS rod bolts revving to 8500 daily, making good power, over 50K miles on engine beaten on by late teens/early 20-somethings with no restraint. Most had shimmed, or VTEC, oil pumps.

See where I'm going with this?

snatch10psi

Sorry i didnt reply was busy. But yeah the ls pump has a shime in-between the allen bolt and the pump itself so that there is more spring travel ,hence a lower spring rate and less oil pressure. That is the reason it isnt adequent enought for vtec engines. No, from what all i seen all the spring part numbers for all b series pumps are they same. its just the washer thing in between the allen screw/bolt thing

http://www.team-integra.net/forum/di...g+Common+Topic

That will clear it all up enough guys and sorry for all those who kicked out the seroius cash for the TYPE R oil pump :/