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Carbon Buildup on Secondary Runners

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Old 07-02-15, 06:16 PM
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Carbon Buildup on Secondary Runners
Any idea what could be causing carbon buildup on the secondary runners? Double Throttle Valves?


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Old 07-02-15, 07:20 PM
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that is pretty normal, its what the runners look like when the throttles aren't open very much
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Old 07-02-15, 10:32 PM
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Doesn't look to be much buildup at all really. Nothing other than what's normal anyways.
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Old 07-02-15, 11:33 PM
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Crankcase recirculation residue?
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Old 07-02-15, 11:49 PM
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Reversion pulses; lots of operation under vacuum, e.g., cruising. Normal unless you're wide open all the time.

Note that porting can also make the condition more pronounced.
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