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How Heat Management Works
Heat Management System
The ESPFI systems also incorporate a sophisticated heat management system that operates in
three-phases to keep things cool in extreme conditions.
Phase I: If the ECM detects engine temperature above approximately 300° F while moving or
stationary it reduces the idle speed. A lower idle speed produces fewer combustion events per minute
and that reduces engine heat.
Phase II: If the ECM detects an engine temperature that’s still drifting higher while moving or
stationary it richens the AFR. An increased amount of fuel in the air/fuel mixture has a cooling effect
on the engine.
Phase III: If the ECM detects an engine temperature that’s still drifting higher while moving or
stationary it directs the fuel injectors to skip, (only when the bike is stationary) and not deliver fuel on
every intake stroke. This limits the number of combustion events taking place, which produces less
heat.
The three phases just described function seamlessly, and the rider may not notice the transition from one phase to the next.
I dunno how y'all are checking your temps, I do know my M8 with the Dyno Jet has seen temps up to over 300 degrees, My fan is on, No knocking or loss of power. My plugs are burning light gray with 90 octane gas. The M8 can take this heat better than its cousin the TC IMO The M8 also cools down at least 50 degrees faster than the Tc engines, I can hand touch the heads after about 10 minutes, my temperature will be around the ambient air temp the next time I fire it up, that can be as soon as 1/2 hour later, Nuff Said Enjoy your ride and PLEASE stop worrying JMO
Originally Posted by IndyBill
