LegendsRacer - Legends & Bandolero Racing Forum

LEGENDS => Lubrication => Topic started by: bracey on September 12, 2012, 03:01:27 am

Title: Oil pan shimm size
Post by: bracey on September 12, 2012, 03:01:27 am

Hi, I need to shim my low pressure valve in the sump to up the flow rate of the oil, what size should the shim be. I have found many post about shimming it but no mention of the size ? :-\



Regards Nick

Title: Re: Oil pan shimm size
Post by: racerrad8 on September 12, 2012, 09:15:17 am

Nick,

Can you explain how installing a shim in oil pressure relief valve will increase oil flow?

 Unlike a car oil pump that has a built in pressure regulator that can be shimmed or stiffer spring will raise the oil pressure, the Yamaha oil system only uses high pressure relief valves.

This system is a safety valve in case of high pressure, not a way to control oil pressure.

Randy - RPM

Title: Re: Oil pan shimm size
Post by: knoxracing on September 13, 2012, 07:57:06 am

Are you referring to boosting the pressure for the use of a 3 port oiling system? This has been discussed multiple times. We do not do any shimming to our motors and have not had any oiling problems.

Title: Re: Oil pan shimm size
Post by: racerrad8 on September 13, 2012, 02:32:29 pm

Quote from: knoxracing on September 13, 2012, 07:57:06 am

Are you referring to boosting the pressure for the use of a 3 port oiling system?

How do you "boost the pressure"?

Randy - RPM

Title: Re: Oil pan shimm size
Post by: justfreaky on September 13, 2012, 09:06:36 pm

Shimming the oil pressure spring is an old racers trick. As Randy pointed out, the Yamaha engines use a  high pressure relief valve. You would likely end up bypassing your oil coolers or oil filter by raising the pressure.

Steve

Title: Re: Oil pan shimm size
Post by: canabl on June 19, 2013, 06:57:42 pm

I had the same question after being told to shim the sump oil pressure system, then i was told by another that they tap the valve and put a bolt into it, I'm guessing that it is to max the valve out for flow, Im only looking to run a single cooler and my old motor had a y adapter joining the back and sump feed lines into one then onto the cooler. Just cant afford the cost to ship out the Hank setup to Australia.