C4VetteLS1

Stock for stock (non-ported or whatever). Whats the exact difference between the two oil pumps.

Porting only keeps the pump from ever having the check ball stick.
Are they a pressure difference?

Country Boy

iTrader: (24)

Its the same pump with the same part number. The only thing porting does is get rid of the rough casting at the opening where the pick up goes. Noone does anything to the check valve bore.

C4VetteLS1

I thought the LS6's run a higher pressure or something?????????

Then why on earth shouldnt i use my factory 20k mile oil pump?

Country Boy

iTrader: (24)

The pre 00s had a bad problem with the relief valve sticking open and its a good change for them. People upgrade to the ported because the ported one *could* flow better because of the improved oil inlet. Its a big difference from stock. Other than the relief valve, theres nothing to fail on one.

C4VetteLS1

Ive noticed in several f-bodies that ive done work on compared to several z06's....


has anyone else noticed z06's run quite a bit more oil pressure than other ls1's?

PlainwhiteZ28

i have a ported TSP pump

8 psi higer at warm idle

sky rockets under WOT coompared to stock

Ferocity02

iTrader: (60)

My ported LS6 pump from TSP has more idle pressure than stock. Stock, it was at about 40 psi at warm idle, now it's about 50 psi warm idle, and like 55-60 cold idle, never really looked at it under WOT but it definitly goes pretty high.

superslowjoe

I just installed my TSP LS6 oil pump, my cold idle is around 45psi, warm idle is 50psi and WOT is almost 75 psi

L-EATER

iTrader: (2)

I think they put a shim under the spring or maybe a new spring altogether and they remove the casting flash. I ported my own and bought a special hone from Snap-On to hone out the bore valve-I had two previous pumps hang the valve open and that was starting to get old in a hurry. I did this on both my trucks and so far so good. After honing the bore I made a small polishing bit for my drill and used Mothers polish to really slick it up-no chance of my valve sticking!! My pressure is on the low side, though 'cause I opened up the bearing clearances to SBC specs.

Country Boy

iTrader: (24)

I dont see how the being a LS6 pump it will raise the pressure. Theres nothing different inside of it.

Brains

iTrader: (7)

I think it'd be more in how the shortblock is assembled and oil pressure sending unit differences that determined the indicated oil pressure. Heck, I have a stock pump (unported) in my car, and it develops an indicated 58 psi hot idle, 70 psi cold idle... heck it'll pin the gauge if you go above 3000 RPM when its still cool.. WOT fully warmed up is 70-75 psi .. I'd personally like to verify with an aftermarket gauge before comparing, because I don't trust the dash gauges to be accurate. I treat them more or less as "animated idiot lights."

Tin Indian

Jim ...

That TA I sold you has a ported Katech pump. They port the pump for better flow, but the oil pressure remains the same since since they don't alter the pressure relief spring or shim the spring. I understand they also clean up the bore that the pressure reief valve rides in so it won't stick and loose presure. The pump was purchased through Thunder and changed when I did the cam, heads, and headers at 32,000 miles.

BTW, I still have NOT recieved that check you still owe me.

Ron,

2000Firehawk

iTrader: (248)

More pressure = HP loss..

Back in my Mopar days the Mopar engineers stated that you only need
10 psi per 1000 rpm..

My HemiCuda with fully grooved mains, sitting at the tree had 10-15 psi at 1,000 rpm... and 60 psi at 6,000 rpm going thru the traps...

This always bothered me, so every other month I would drop the pan for bearing checks... They always looked excellent with no problems...

So , low oil pressure is a-ok...

Just remember, you need 10 psi per 1,000 rpm...

Dave

Patman

I know it's a different engine but my LT1, once warmed up, only puts out about 20psi of pressure at idle (automatic trans in drive) and only 45-50psi at WOT. The car runs much stronger than most LT1s, and gets incredibly good wear numbers in oil analysis (most notibly my lead content-which represents bearing wear-is very low), so I know the engine is not starving for oil pressure by any means.

C4VetteLS1

Well i guess ill cancel the ls6 pump i was sending over from GM (like $65 bucks new).

I'll just clean up my own stock ls1 oilpump for this motor...

Tin Indian: Actually weve already got that motor/tranny from your TA running and done in the 72 truck....been putting all kinda miles on it, runs GREAT. who would expect an old truck to be so quiet and run that hard.

zombiedude

iTrader: (1)

I think the most important thing about oil pressure is what weight oil you are using. It makes a differance if you run 5w-30 and someone else has higher oil pressure because they are running 20w-50.

Tin Indian

____________________________________________

Jim, thanks for the check!

David Plum

Ck out melling now has pump available

eallanboggs

iTrader: (1)

I installed one and the idle pressure jumped from 40 to nearly 60 at idle and slightly higher across the board at all RPMs.