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Carbon Buildup on Secondary Runners

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Jul 2, 2015 | 06:16 PM

#1

TomU

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It Just Feels Right

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From: Arlington, VA

Carbon Buildup on Secondary Runners

Any idea what could be causing carbon buildup on the secondary runners? Double Throttle Valves?

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Jul 2, 2015 | 07:20 PM

#2

j9fd3s

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From: https://www2.mazda.com/en/100th/

that is pretty normal, its what the runners look like when the throttles aren't open very much

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Jul 2, 2015 | 10:32 PM

#3

SA3R

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From: Australia

Doesn't look to be much buildup at all really. Nothing other than what's normal anyways.

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Jul 2, 2015 | 11:33 PM

#4

Monkman33

Goodfalla Engine Complete

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From: Kennewick, Washington

Crankcase recirculation residue?

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Jul 2, 2015 | 11:49 PM

#5

Speed of light

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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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