shimming oil pump
Thread Starter
Launching!
Joined: Jun 2002
Posts: 212
Likes: 0
From: TX
shimming oil pump i need to know how to shim and what to port on a stock ls1 oil pump. asap because i have to go inside the motor and replace an oring so i might as well as do it. please help.
On The Tree
Joined: Feb 2003
Posts: 134
Likes: 0
From: Sydney, Australia
Re: shimming oil pump I am going to do my pump as well and I was told to use a 0.135" shim (I believe it has to be round to fit under the spring). It was advised to me to port the inlet and outlet sides of the pump as well, but I haven't got to this job yet, so I'm not exactly sure what this entails.
TECH Fanatic
Joined: Nov 2001
Posts: 1,975
Likes: 2
From: SW Florida
Re: shimming oil pump I didn't shim mine. In fact my ported Katech pump didn't come with shims, but I have heard that the "shim" is nothing but a washer placed under the spring. Nothing to it at all. Pretty simple operation....
The stock pump should give you about 40 psi at hot idle and about 55psi at hot highway speed. Do you really think your engine [needs] more than that?
A shim is not going to increase pump volume.....
The stock pump should give you about 40 psi at hot idle and about 55psi at hot highway speed. Do you really think your engine [needs] more than that?
A shim is not going to increase pump volume.....
