oil pump, which one Options

[trojanhorsepower]

All,
I am looking to change the oil pump as a way to up my oil pressure. I understand that this may well not help, but having a new oil pump around is OK.
With that in mind, what are my options? I will pull the motor but hope to not split the case. Is this even possible? Which pump?

Thanks

Peter

[Superhawk996]

Revisit my post #14 in your original thread.

You need to understand what is causing your issue before simply hoping for a better pump. Do you know what your current oil pump end clearance was?

If you’re hell bent on buying a new Type 1 pump blindly, have the vendors measure the pump OD with a micrometer and get one that is the proper dimension. A couple thousands of an inch undersize is a huge deal and amounts to an internal leak that limits oil pressure - especially when hot and especially at idle.

WRT to the question about splitting the case. You don’t have to split the case to swap an oil pump.

[JamesM]

Yeah, what?

Are you looking for just a "new" pump or a larger pump? New type 4 pumps do not exist and none of the available type 1 pumps fit properly and (assuming you have a stock type 4 pump) will most likely make your pressure issues worse due to the excessive pump body to case clearances. A few vendors sell o-ringed pumps to try and remedy the clearance issues but 1. it doesn't fully as orings can only seal the sides of the pump and does nothing about the output leaking back to the input side AND 2. forget about trying to install an o-ringed pump on an already assembled engine.
ALSO A larger pump may move more volume, and it will take more HP do to so, it may also not gain you any pressure and is likely to overwhelm your oil cooler bypass (which may already be occurring anyways) and roast your oil.

Probably should be asked what sort of oil pressure are you currently looking at?
What sort of oil are you currently running?
and When was the last time you pulled your engine tin and cleaned out all the crap?

If you insist on a band aid approach:

Step 1. if you dont already have one, get one of @chrisfoley Oil pressure relief valves. Chances are if your oil pump is worn your bypass valve/spring are worse

Step 2: If after that you still insist on replacing your pump talk to Jorge at European Moterwerks. He sleeves and machines a 27mm type 3 pump to work on a type 4. Its expensive for a VW oil pump but its the only one available that I am aware of with proper port placement, proper clearances, and no O-rings to tear installing on an assembled case.


Someone in Europe had made a run of billet type 4 pumps a while back but haven't seen them in a while, and between the cost of the custom billet part and how the import tariffs have been hitting car parts you would have to really hate your money to bring one in now.

If you’re hell bent on buying a new Type 1 pump blindly, have the vendors measure the pump OD with a micrometer and get one that is the proper dimension. A couple thousands of an inch undersize is a huge deal and amounts to an internal leak that limits oil pressure - especially when hot and especially at idle.

I don't believe they exist, if you find a reliable source please let me know. You would still want to port match them as well.

[Superhawk996]

Someone in Europe had made a run of billet type 4 pumps a while back but haven't seen them in a while, and between the cost of the custom billet part and how the import tariffs have been hitting car parts you would have to really hate your money to bring one in now.

@JamesM

I bought one of those T4 CNC billet pumps back when they were available.

30mm gears so limited use cases
It does have the proper OD and port match
Idler shaft was not pinned or peened as I prefer to do with any T4 pump.


With respect to sizing of T1 pumps it’s a tolerance game - there are some out there that are only 0.001” undersize so it’s a sorting game to find the best parts. I don’t have a reliable source for “good” parts. Your info on the modified T3 pump is interesting. Have never seen that service listed on the website but good to know.