1G Oil pump questions

[Purple_T63]

I am having trouble choosing what oil pump I should choose for my car. I have 4 oil pump casings and 3 sets of straight cut oil pump gears.

I have measured all of them in their respective casings.

I am disappointed in the overall quality and feel of the ACL unit but can't tell if it would affect the overall performance of the pump.
Also has anyone swapped straight cut gearsets into the ACL units before?


3 OEM
1ACL/ORBIT (Brand new)

I need some input on this, has anyone ever used the ACL on a high horsepower engine?

I am building a fully forged engine
Eagle rods / Wiseco pistons
FP Red
Fully built head with 272's
Planning on reving it to 9000 RPM
And hopefully 550 hp.

I know there's many questions in this so hopefully it makes sense.

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[Anfurnyy]

I haven't had any first hand experience with the ACL pumps but from previous posts I've seen they require anywhere from small - quite a bit of detailing / deburring but other than that I think lots of people run them.

 

[diambo4life]

OEM. It's all I have ever ran in my cars and I have never had to replace them, ever. 9000rpm rev limit, with power all the way to 800WHP.

 

[92AWDHX40]

Its your choice cant go wrong with oem or a new engine, some have with no problems with oem gears, Russian roulette.

 

[curt-s]

I have an ACL.. immediately disappointed by the quality. Sits in a box.
I also remain the same, due to freshly being disappointed, with their bearing quality.

I chose to clean and reuse the OE pump on my engine.

 

[92AWDHX40]

so dont chance it with a oil pump is so important spend the money once spend it right.

 

[DSMPT]

I have run a couple of ACL pumps and revving over 9000 rpm. I hadn't had any issues.
But the oil pump is not something goes bad often and important, if the used OEMs you have are in spec, I would go with it. I prefer the used OEM than new ACL. My 2g's oil pump is 30 years old OEM, still working good.
Keep in mind that not to mix up the front case and the pump gear cover between those 3. The front case and the pump gear cover have to be matched, like cam caps or main caps.

 

[Purple_T63]

I have run a couple of ACL pumps and revving over 9000 rpm. I hadn't had any issues.
But the oil pump is not something goes bad often and important, if the used OEMs you have are in spec, I would go with it. I prefer the used OEM than new ACL. My 2g's oil pump is 30 years old OEM, still working good.
Keep in mind that not to mix up the front case and the pump gear cover between those 3. The front case and the pump gear cover have to be matched, like cam caps or main caps.

Okay good to know! All of my OEM pump measured similar but the casings all had different wear marks on the inside, some worse than others. Will inspect all of them again and go from there.

 

[luv2rallye]

Have you watched Jafromobile's video for helpful tips?

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[Galant665]

Running three ACL pumps now. One has 30k hard miles. Another 4k street and Dyno miles. Tested lot stuff on that car. Third is in a six bolt few thousand miles. Haven’t had any problems.