shimming oil pump for more pressure - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

tastyratz · 03-06-2006, 08:46 PM

Ive heard in alot of places but not seen explained the idea of shimming the oil pump to get more pressure out of it. Can someone elaborate on this concept? How thick should the shims be to make x difference? I want to do this to my SOHC to get some extra pressure out of her. Anyone want to actually break it down for me? Where is this spring located/ how do I get to it?

phrozen · 03-07-2006, 12:18 AM

use a 280zx oil pump, for ka24de u have to have it shimmed, ive been tryign to find someone that does it

tastyratz · 03-07-2006, 06:26 AM

I know I can use a 280zx pump and thats a good thing, however I would rather just shim the stock pump for an extra 15psi or so of pressure for free (or almost free). Theres no need to spend 100$ if I dont need to, stock pumps are almost indestructable and if it blows up, I have another. I think I figured how to get to the valve but I dont know how much I need to shim however

allmotorKA · 03-07-2006, 11:04 AM

Unscrew the large hex plug on the oil pump and the springs are inside. You can put washers inside the hex plug to increase spring compression and therefore increase pressure. I don't know the thickness required for +15 psi but its just trial and error type of thing anyway.

Nissan Motorsports also sells stiffer springs for both the inner and outer springs. You can change one or both to get the pressure you need...but again, the shimming method is much cheaper.

03-06-2006, 08:46 PM	#1
tastyratz Zilvia Addict Join Date: Dec 2003 Location: nh Posts: 995 Trader Rating: (4) Feedback Score: 4 reviews	shimming oil pump for more pressure Ive heard in alot of places but not seen explained the idea of shimming the oil pump to get more pressure out of it. Can someone elaborate on this concept? How thick should the shims be to make x difference? I want to do this to my SOHC to get some extra pressure out of her. Anyone want to actually break it down for me? Where is this spring located/ how do I get to it? __________________

03-07-2006, 12:18 AM	#2
phrozen Zilvia FREAK! Join Date: Apr 2003 Location: Bay Area Posts: 1,352 Trader Rating: (0) Feedback Score: 0 reviews	use a 280zx oil pump, for ka24de u have to have it shimmed, ive been tryign to find someone that does it __________________ This box is 400x200: Please do not put your sig pic back if it exceeds this. -Moderation

03-07-2006, 06:26 AM	#3
tastyratz Zilvia Addict Join Date: Dec 2003 Location: nh Posts: 995 Trader Rating: (4) Feedback Score: 4 reviews	I know I can use a 280zx pump and thats a good thing, however I would rather just shim the stock pump for an extra 15psi or so of pressure for free (or almost free). Theres no need to spend 100$ if I dont need to, stock pumps are almost indestructable and if it blows up, I have another. I think I figured how to get to the valve but I dont know how much I need to shim however __________________

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03-07-2006, 11:04 AM	#4
allmotorKA Zilvia Member Join Date: Nov 2001 Location: SoCal Posts: 204 Trader Rating: (1) Feedback Score: 1 reviews	Unscrew the large hex plug on the oil pump and the springs are inside. You can put washers inside the hex plug to increase spring compression and therefore increase pressure. I don't know the thickness required for +15 psi but its just trial and error type of thing anyway. Nissan Motorsports also sells stiffer springs for both the inner and outer springs. You can change one or both to get the pressure you need...but again, the shimming method is much cheaper.