Wickedone

iTrader: (12)

I am going to replace my ls1 oil pump. The motor is stock. Is there a reason not to run a ported pump? I don't care about cost, I only want to do this once.

So are there any downsides to a ported pump?

BTW- I plan on road racing the car.

BIG BAD BLACKSS

iTrader: (4)

Only downside is a little more cost. Get the ported pump. TSP seems to be the cheapest one but they all vary by only 10-20 bux.

N4cer

iTrader: (11)

I'm running a TSP ported oil pump. Very good pressure and no problems whatsoever. I highly recommend it.

NviouSS

iTrader: (8)

just one less part to buy whenever you do a cam swap

Studytime

iTrader: (15)

Cool. Just remember guys porting it will not improve pressure. It's a positive displacment pump. Porting it will only require less hp to drive it. Shimming the pressure relief is what allows it to build more pressure.

Ben T.

N4cer

iTrader: (11)

Of course. That wasn't my point. I guess I just assume that everyone knows better, but you're right - better make sure they understand. My point was that it is performing well and I'm not seeing any leaks or other issues. Porting should THEORETICALLY reduce pressure, although it would only be by a fraction of a PSI over the entire system.

Studytime

iTrader: (15)

N4cer, I knew what you meant, but wanted to make sure others did too.

Ben T.

junior28570

iTrader: (22)

I, for one, appreciate the extra details I didn't know an advantage was less HP to drive a ported pump.

chummmma

iTrader: (8)

what about a ls4 pump? i was told at GM it flows 33% more?

Specialized

iTrader: (15)

Have yet to see that done on a ls1 block. Interesting proposition.

Wickedone

iTrader: (12)

I realized a ported pump wouldn't increase my pressure, but wouldn't it increase the amount (volume) of oil?

N4cer

iTrader: (11)

Theoretically, it could increase flow without increasing pressure. But if you're talking overall system pressure, the pump is only a small part of the system. So it's fractional.

Studytime

iTrader: (15)

No, it will not increase the volumetric flow rate either by porting the pump.

Ben T.

Billdog350

iTrader: (3)

this makes sense since the gearators are still moving/displacing the same volume. All you're doing is making it easier for oil to get in and out.

I'd like to see PSI, volume and hp tests done on ported vs stock pumps so we know if they're worth it or not.

Studytime

iTrader: (15)

I can predict the difference in pressure and volume. See above.

As for is it an appreciable amount of power? Well, every little bit helps, right? After you add up enough 2s and 3s, you start to have an advantage over the next guy.

Ben T.

GPM30236

When you put one in inspect it carefully,

just tore down an engine where the porting had drilled through the body of the pump,3 times they welded it ( ) and then put it into the engine, no numbers or markings on the pump so not sure who did the work or which pump it was. it appears on magnification that there was a crack at the weld. likely opened up when the pump got hot and allowed some air into the body of the pump, REALLY easy to tell where the welds were.

N4cer

iTrader: (11)

Oh wow. If I had gotten one like that, I'd make sure to take pics and totally go after the f'ed up company that sold that without informing me. That's just not acceptable to sell a junk product for someone to put on his motor.

BLKWS.6

Ls1/6 oil pumps are driven off the crank. My 5.0's was driven off the dizzy, any advantages/disadvantages here?

gun5l1ng3r

You should check out the melling pumps. Supposedly they are a higher volume pump, for the same price as a ported pump.

shoemike

iTrader: (25)

ported pumps dont move more oil. you need a bigger pump. use the melling if you wish to move more oil .