Machining Oil Pump
 

I've watched a few videos but none that looked to be professional. I have an aftermarket spring to go in the oil pump rather than a shim. But I was wondering about the porting part or it. I've seen where people machine the lip out of the tube with the 10mm hex. Enlarging the interior of the tube. I'm wondering if this was an actual improvement or what someone thought may be an improvement. I understand curving the inside of the corners for a smoother turn. But I am specifically referring to running a drill bit on a press through the tube to increase volume.
https://cimg6.ibsrv.net/gimg/honda-t...b0af5dcd32.jpg
https://cimg8.ibsrv.net/gimg/honda-t...50250147e4.jpg

Re: Machining Oil Pump
 

You don't have to be a professional to port/shim the oil pump. Just "bore" out the channel with a larger diameter drill bit and make sure the wall is smooth. As for the spring, just re-use the stock one and utilize a shim washer. It's not that difficult.

Yes, there is an improvement in oil pressure. I ported the new D16y8 pump in mine and it's working fine.

Re: Machining Oil Pump
 

I think I'm just going to take out that step and that be as big as I go. I didnt know if there would be an advantage to that or not. Aside from smoothing the corners. I bought an aftermarket oil pump spring from apocalypse racing on Ebay. I just hope it isn't too much.
https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F14 2280300412

Re: Machining Oil Pump
 

just be careful. if you enlarge or damage the area where the relief valve rests, it will leak, and you will LOSE a LOT of oil pressure. And if you enlarge the hole enough to remove the lip, the relief valve will not have anything to seal against, and you'll have ZERO oil pressure