rx7vadim

oil control valve is located by front cover that has a spring and a piston. will the pressure go up(resulting in better protection for all bearings at high rpm.) if i stretch this spring 1/2"? to get 50 psi at idle and 100 at high rev. will this work?
i have mech. guage. my pressure is about 65psi at high rpm and 15 at idle.
my motor is out so i have easy acces.

RotaryEvolution

iTrader: (30)

15 at idle is a little low but nothing to be alarmed about.

now my question is are you planning on doing this to a turboed engine or is this an n/a?

the oil control valve in the front cover is a dump valve, it doesn't regulate oil pressure to the internals just as a precaution for the whole system. the main pressure regulator is on the rear iron facing forward. you can stretch the spring, install a stronger spring or peen the end of the regulator in to put more tension on the spring.

Turbo II

iTrader: (1)

If you're not running a Mazda oil filter try that also. On both of my cars they read higher using the Mazda one than anything else.

rx7vadim

thanx karack, so the regulator on rear housing can be modified? my car is 86 with 91 motor n/a. higher pressure wont hurt, i think it will add longer bearing life and added realibility.
my mechanic 35 years of working on rotaty, said that he never heared that regulator could be modified on 2nd gen, he said only old school rotaries can be.

rx7vadim

will that pressure also go to rotor oil rings?

RotaryEvolution

iTrader: (30)

np, i'm sure mazdatrix probably has some little bits on how to up the pressure also.

cmanns

Is 20 before you rev it past 3K fine then 40 after its been reved to 7K?

RotaryEvolution

iTrader: (30)

again, a little low but nothing to be alarmed about. have you double checked it vs a mechanical gauge?

rx7vadim

3k is about 60psi, karack will does oil presure go on rotor control rings? or there is no presure there.

rx7vadim

in 2 days i will start my motor that i rebuild, it could be a happy day or worth days ever.

RotaryEvolution

iTrader: (30)

the oil control rings should see near that same pressure which is why they tend to commonly fail in older engines.

rx7vadim

mine r not brand new, looked to me like they were on good condition, the 91 motor had absolutely no ruber on inner rings, so i used 86 rings from my 86 donor motor.

rx7vadim

did u end up building any experimental drag motors?

RotaryEvolution

iTrader: (30)

so you reused the o-rings in the oil control rings? big mistake.

if you're lucky it won't smoke a ton in the lower RPM range but likely it will smoke like a train in the upper RPM range.

Aaron Cake

iTrader: (1)

If you can wait a few weeks, I'm going to post a big writeup on how to shim the oil pressure regulator on my website...