Re: Post throttle vs Pre throttle
It is possible at the end of the exhaust stroke over lapping the commencement of the in take stroke. More pronounce on cam with large overlap.
It can take place either way, some hot gas is blowing into the inlet tract (short exhaust) or charge air and methanol is drawn into the cylinder by the vacuum created by the exhausting gas.
It is not detonation but pre-ignition mentioned.
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Richard L
aquamist technical support
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