So, someone explain this to me.
#11
Throttle is closed vacuum is generated on intake down stroke. Compression brings the pressure back to around atmospheric. Exhaust valve opens somewhere above BDC basically unleashing a substantial vacuum on the exhaust. The only difference from this and truth is that a small combustion event occurs, but the rag was sucked in on decel, in which if he is in full fuel cut there is no combustion so a substantial vacuum occurs.
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