What oil pump for 7k, road race, and axle oil lifters? - Page 2 - LS1TECH - Camaro and Firebird Forum Discussion

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What oil pump for 7k, road race, and axle oil lifters?

 
Old 01-10-2019, 05:02 PM
  #21  
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Originally Posted by NSFW View Post
The most promising theory I know of for the Gen 4 oil starvation issue is that the oil doesn't drain back from the heads fast enough. Restricted pushrods allegedly help somewhat, and one guy even put AN fittings into his heads so he could run hoses to the pan, but I don't think I saw how that turned out.
This^. The above is one of the reasons the C5R block with 6 style heads (OE or aftermarket) is still popular with the circle track and road race crowds.
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Old 01-29-2019, 11:01 AM
  #22  
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Ended up ordering a Schumann oil pump.

Last edited by bthomas; 01-29-2019 at 01:20 PM.
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Old 01-29-2019, 11:19 AM
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Originally Posted by bthomas View Post
Ended up ordering a Schumann pump. Went with the extra volume, externally pressure regulated version.
arguably the best pump on the market.
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Old 01-29-2019, 05:22 PM
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https://www.melling.com/5-25-18-new-...y-main-oiling/

Perfect for high Rpm and fits normal Ls blocks
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Old 01-29-2019, 06:19 PM
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Originally Posted by Smokey B View Post
https://www.melling.com/5-25-18-new-...y-main-oiling/

Perfect for high Rpm and fits normal Ls blocks
that pump has less flow than oem, not something I’d want for my application
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Old 01-29-2019, 06:34 PM
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Hmmm...what happens with high rpm factory style oil pumps. Foaming [COLOR=left=#222222]of the oil. If the pump is slowed down, no foaming of the oil[COLOR=left=#222222]. [/COLOR][/COLOR]

Last edited by Smokey B; 01-29-2019 at 06:44 PM.
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Old 01-29-2019, 06:40 PM
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Not running that pump. The extra oil volume is a good thing to have.
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Old 01-29-2019, 06:48 PM
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Called and asked about the pump and was told it's better for higher RPM as not to create foaming or cavitation. Guess they don't know what there doing, or was told bad information. I think they know what their doing or believe they do.

Last edited by Smokey B; 01-29-2019 at 06:54 PM.
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Old 01-29-2019, 06:59 PM
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Melling pumps in general don’t cavitate like GM pumps do. The best pump for fighting cavitation is the Schumann pump mentioned above. I run a Melling 10296, ported by Tony Mamo. The 10296 is a high pressure, high volume pump. The 13% extra oil volume is good for keeping bearings cooler.
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Old 01-29-2019, 07:02 PM
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With you on what you said....so why was it made? And fits normal Ls blocks. I have the high pressure Melling that was ported by me. Kurt Urban stated that if the style pump was slowed down it would make for a better high rpm oil pump. Seems to me they answered the call.
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Old 01-29-2019, 07:16 PM
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The Melling article says for aftermarket blocks with priority main oiling.

A little background on what is priority oiling:
  • Non-Priority Main Oiling (OEM Blocks)
    • A common upgrade on aftermarket blocks is priority oiling. Priority main oiling ensures that oil goes to the mains first and to the heads as a secondary path. This ensures that oil pressure drops have a minimized effect. A stock LS block does not feature priority main oiling. In an OEM setting priority main oiling makes less sense because the engines are expected to spend very little time at high rpm.

I can see where such an aftermarket block wouldn’t need all that extra flow, but with a street driven oem block I wouldn’t run it.
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Old 01-29-2019, 07:24 PM
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Cavitation in an LS pump, particularly the GM pumps, happens at high rpm so perhaps Melling made this particular pump with ultra high rpm in mind? I’m totally guessing on that one, as I’ve never even seen this pump before. Personally if I’m going over 8k rpm, I’m going dry sump setup.
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Old 01-29-2019, 07:45 PM
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No you cooking with hot oil. Dry sump cost is more than some short blocks, unless you piece together the Ls7 dry sump.
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Old 01-29-2019, 08:14 PM
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Originally Posted by Smokey B View Post
No you cooking with hot oil. Dry sump cost is more than some short blocks, unless you piece together the Ls7 dry sump.
Done correctly, you are correct. This hobby is expensive.
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Old 01-29-2019, 08:29 PM
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I talked to schawanky race engines just last week about oil pumps. They said they have tested them all and use gm # 12612289. It's in the gmpp book listed as a l92 pump. Schwanky said it starts at a higher pressure and as it falls off at higher rpms it maintains pressure because it starts higher.

They build lots of road race engines.
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Old 01-29-2019, 08:46 PM
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Originally Posted by HioSSilver View Post
I talked to schawanky race engines just last week about oil pumps. They said they have tested them all and use gm # 12612289. It's in the gmpp book listed as a l92 pump. Schwanky said it starts at a higher pressure and as it falls off at higher rpms it maintains pressure because it starts higher.

They build lots of road race engines.
Improved Racing lists that pump as a high volume pump, for a DOD engine that requires it. Most other sites, like Summit for instance lists the pump as a std. volume/ standard pressure unit. A lot of race shops prefer the high volume pumps, Tony Mamo included, and for good reason.
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Old 01-29-2019, 09:12 PM
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Just telling you what they said. That pump is in Big Hammers 8k rpm 388.....it's what I'm going with.
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Old 01-29-2019, 09:25 PM
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Originally Posted by HioSSilver View Post
Just telling you what they said. That pump is in Big Hammers 8k rpm 388.....it's what I'm going with.
Not arguing with you sir. I run a high flow pump as well. I like the extra oil personally.
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Old 01-29-2019, 09:42 PM
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I'm not arguing. Just telling you guys what they said. There seems to be some mysteries surrounding the oil pumps. I've been wondering the same stuff myself for my build. That's why i called schwanky.

We just put a melling in my buddy's c6 ls3 car.

None of these gerator style oil pumps are great at high rpm from what i can find.
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Old 01-30-2019, 08:13 AM
  #40  
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I run the LS4/DOD pump ported by Synergy #12612289. Higher flow than the 10296... I did the Synergy pump because he clearances the cover to fit with double roller chains. So it made my Rollmaster installation pretty much plug and play without having to grind everything.

I see 55-60psi hot at idle with Joe Gibbs LS30 oil. And I run the truck filter along with an extra quart of oil. Then you use something like an Improved Racing crank scraper and baffle to keep the oil off the crank to free up any HP sloshing oil saps.

I also run the Johnson 2126SLR short travel lifters with axle-oiling.
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