This is oil right?
Race Director
Joined: Dec 2013
Posts: 12,502
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Normal carbon deposts, hence system runs in closed loop at less than WOT, so it trying to hold 14.7 afr, while during WOT, runs around 13.5 aft to get the most power in open loop, and why you tend to see more carbon the more you run the car at WOT.
Also, vavle stems do not show excess fouling from leaking valve seals, so short of tune on car that has it running richer during open loop WOT, exhaust side does look kind of normal.
Also to add, the more the engine is played rev ranger in higher RPM's, the more oil vapors that the Evap will be pushing through the intake system to be burnt off by the motor, so the more carbon deposts in the exhaust system/rear fender of the car you get.
As for the one valve having more oil burn carbon caking on it, its due to the location of the Evap port into the intake manifold, that will pool the vapor oil more to that cylinder of the motor. So anything, looks like I see some oil catch cans in your future for that way you are driving the car.
Also, vavle stems do not show excess fouling from leaking valve seals, so short of tune on car that has it running richer during open loop WOT, exhaust side does look kind of normal.
Also to add, the more the engine is played rev ranger in higher RPM's, the more oil vapors that the Evap will be pushing through the intake system to be burnt off by the motor, so the more carbon deposts in the exhaust system/rear fender of the car you get.
As for the one valve having more oil burn carbon caking on it, its due to the location of the Evap port into the intake manifold, that will pool the vapor oil more to that cylinder of the motor. So anything, looks like I see some oil catch cans in your future for that way you are driving the car.
Last edited by Dano523; Oct 31, 2021 at 10:29 PM.
