BUSTN

Causes, fixes and opinions. Very disappointing day on the dyno today.

Black Knight RX7 FC3S

iTrader: (7)

worn oil rings causes a lot of blowby in some rx7.
How excessive is excessive?

hollowfikation

iTrader: (1)

Bad oil control ring, springs, seals etc. Does your oil dip stick push out due to the excessive blow by? Filling up a catch can quickly as well?

BUSTN

Catch can. You can hear it under boost while it's spewing oil. What should I be replacing?

hollowfikation

iTrader: (1)

Well your gonna have to tear down the engine to replace the oil control rings, springs or o-rings. They are on the center of the rotors themselves. I would break down the engine and start measuring the seals and springs and reuse what's in spec if your on a budget. At the very least I would do an o-ring kit, apex seals and oil control rings, springs, o rings. hopefully your side seals and spring are still in spec.

How long does it take the can to fill up? Also they're plenty of write ups on rebuilds, I did mine last year in about 3hrs, 10hrs including pulling and stabbing the engine back in, but I sorta do this for a living.

BUSTN

Well the motor is getting pulled this morning. I'll open it at the shop and go from there. I have the ALS apex and side seals so hopefully they are ok. Everything will get get checked and go from there. Smh...

Aaron Cake

iTrader: (1)

Is it just too rich? Running in the 10s will cause massive blowby as it scrubs the oil film off the sealing surfaces.

OEM spec side seal gaps also cause impressive blowby on engines with upgraded turbos. One of the reasons I started building zero clearance.

BUSTN

The inside and uncarriage was soaked? There was drippings on the floor. The motor is out and will be opened in the am.