Last night, I installed the Revup oil pump on my 02 Maxima engine. But before I did, I cracked it open.

Here are some observations.

Revup on left; Non-Revup on right


The first thing I noticed was the casing. The non-revup has a smooth casing with several imperfections and burs. The revup has a more consistent cast without any noticeable burs or flaws.

Here is the other side:


Here they are opened up:


The first thing I noticed was that the rotors are slightly different. The revup has arrow marks on them and the non-revup has little dots. Other than that, they appear to be identical. I hold them up against one another and the rotor lobes have the same exact shape. The rotor dimensions are identical in every way.

But here's the difference I found. On my postal scale (displays in .2 ounce increments), the two non-revup rotors weighed 10.0 ounces while the revup rotors weighed 10.4 ounces. There was a clear difference in weight meaning the metal is different.

I also took a few measurements of the inside of the casing. The inlet and outlet inside diameters are exactly the same. And the depth of the casing is exactly the same as well.

I don't know the major differences between these two oil pumps. But I thought I'd share some of my observations. It appears that the revup oil pump rotors may be stronger. The casing may be a tad stronger as well.

I did not inspect the regulator valve or spring.

What is the main reason why the revup oil pump is known as a better unit for high revs?

 

Its kinda sad I didnt know that was my oil pump when I opened up my 3.5. Good info though.

 

Nice comparison Aaron. Good to see the guts when one is cracked open. I'm only assuming that the material and weight is what makes the difference in performing, but I'd like to hear a more technical explanation as well.

 

I remember reading from people that have compared both that the only difference is that the inner rotor (that rides the crank) is stronger than the non-revup.

 

Yeah. I didn't bother weighing both rotors separately.

 

I can send you a pics of the Toga hi-rev oil pump if you'd like to compare.

 

good internal comparison.. i held both of mine side by side and could barely tell any differences as well... it better hold up to its name and rpms.. thats all i know

 

Just checked mine and found that the stock relief spring on the non-revup, Matt (SR20DEN) counted 16 coils, and the revup we counted 15 coils. Possible that the spring rate might be different as well but we did not have a measuring device.

Has anyone tried or know if the HR pump will work?

 

I was under the impression the RevUp has stonger springs .. possiable the amount of springs and the material used makes the pump stronger.

Good find Aaron

 

I didn't bother looking at the spring. All I did was inspect the rotors and weigh them.

 

We weren't going to either until we were like, well since we have it apart already. Should have taken a pic of it, but it's all good. I wish I had a scale, and also a spring rate tool.