Installing melling oil pump
Thread Starter
Instructor
Joined: Jul 2008
Posts: 123
Likes: 3
Installing melling oil pump
I’m in the process of installing g the pump and after reading some posts and watching a video I’m unsure if shimming the oil pump is necessary or it should be fine without?
also, it came with 2 springs, high and low relief. Which 1 is recommended?
I have a built motor going the turbo route.
Thanks in advance
also, it came with 2 springs, high and low relief. Which 1 is recommended?
I have a built motor going the turbo route.
Thanks in advance
Melting Slicks
Joined: Nov 2013
Posts: 2,049
Likes: 316
From: USA
which pump did you get?
I would generally follow the builder advice on oil pump and built motor as they will know the bearing clearances and such. My builder recommended a higher volume pump, so that's what I got.
Before knowing your specifics, I would say go ahead and install the stiffer spring so you get a little more pressure at high rpm.
I would generally follow the builder advice on oil pump and built motor as they will know the bearing clearances and such. My builder recommended a higher volume pump, so that's what I got.
Before knowing your specifics, I would say go ahead and install the stiffer spring so you get a little more pressure at high rpm.
Burning Brakes
Joined: Jul 2018
Posts: 1,113
Likes: 144
From: Miami
I just came fresh from finishing my build so it's all fresh in my head. If you ordered a 10295 pump, it comes with the 10%higher pressure relief spring already installed (the red spring). It also probably brought a blue spring (lower pressure) and another spring for COPO Camaro which is a VERY HIGH oil pressure relief spring. I left the 10295 with the red spring it brought already installed. I did not shim the pump at all. I also used the black o-ring provided, since my pickup tube was straight not tapered (read the instructions on this, it's important you select the right o-ring). All that said, my new pressures with the Melling Oil pump 10295 are: at cold start oil pressure is 50psi at 95F at idle, 38PSI at 180F at idle, and 32 PSI at 199F at idle. My oil pressure at 190F at 6kRPM is 60PSI.
Last edited by turabo87; Jan 10, 2019 at 06:19 PM.
Thread Starter
Instructor
Joined: Jul 2008
Posts: 123
Likes: 3
I just came fresh from finishing my build so it's all fresh in my head. If you ordered a 10295 pump, it comes with the 10%higher pressure relief spring already installed (the red spring). It also probably brought a blue spring (lower pressure) and another spring for COPO Camaro which is a VERY HIGH oil pressure relief spring. I left the 10295 with the red spring it brought already installed. I did not shim the pump at all. I also used the black o-ring provided, since my pickup tube was straight not tapered (read the instructions on this, it's important you select the right o-ring). All that said, my new pressures with the Melling Oil pump 10295 are: at cold start oil pressure is 50psi at 95F at idle, and 32 PSI at 199F at idle. I forgot now what was my max oil pressure at fully warmed engine, but I can get that for you later.
perfect! Thanks bud that answered all my questions and concerns.
yes 10295 pump. I left the red spring in there and now assembling the pump as I’m typing.
So so I guess I shouldn’t stress about the shimming part!
Burning Brakes
Joined: Jul 2018
Posts: 1,113
Likes: 144
From: Miami
My application is an NA cammed daily/street/Mexico so I didn’t bother to shim. I’m sure you’ll get different opinions here. I owe you my max pressure at fully warmed up temp later when I get out of work, but it’s nice and high.
Team Owner
Joined: May 2001
Posts: 87,334
Likes: 1,589
From: Western NY
OP, when you say "shimming", are you talking about the installation procedure that involves removing the front cover of the pump, and using shims to measure the position of the pump's drive gears to the input drive (or something like that)??
Thread Starter
Instructor
Joined: Jul 2008
Posts: 123
Likes: 3
yes that’s what I meant by shimming
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Thread Starter
Instructor
Joined: Jul 2008
Posts: 123
Likes: 3
Team Owner
Joined: May 2001
Posts: 87,334
Likes: 1,589
From: Western NY
Burning Brakes
Joined: Jul 2018
Posts: 1,113
Likes: 144
From: Miami
You’ll be fine if you don’t shim/calibrate/center the pump. Whatever you decide to do, DONT FORGET THE NEW ORING AND TO PUT THE RIGHT ONE. Also, don’t forget to prime the pump with oil manually before installing. Fill that sucker up and rotate as best as you can, and try to install it with as much oil in it as possible.
Team Owner
Joined: Oct 1999
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From: Guinness Its whats for B'fast JAWGA
CI 3-4-5-9 Veteran
Shimming isn't so much for pressure but to set the rotors at proper clearance so that it doesn't get out of center at RPM. Especially OEM pumps have been known to fail over 6k RPM. I have shimmed 2 oil pumps (1 for my car and another on a friend's) it isn't hard but yes many have had success without taking the extra step.