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Fuel/Spark Effect On Engine Braking

Fuel/Spark Effect On Engine Braking

Fuel/Spark Effect On Engine Braking

(OP)
Just wondering the effects of fueling and spark on engine braking. In my limited experience I have found that more fuel, less timing minimizes engine braking. It also seems to smooth the transition from off-throttle to on-throttle.


I'm talking about high rpm motors (12-15k) and ECU without decel fuel cut.

Thanks in advance.

RE: Fuel/Spark Effect On Engine Braking

well, if you're creating flywheel power then you're absorbing less.

RE: Fuel/Spark Effect On Engine Braking

(OP)
Thanks for the reply.

Is there a reason that the OEM has 50-70 degrees of timing in these areas? My thought was the advanced timing was to increase the volume of gas before TDC to increase engine braking.  

RE: Fuel/Spark Effect On Engine Braking

Nothing technical stopping the employment of negative work for engine braking if that's what's desired.  Seems less wasteful to employ fuel cutoff/open throttle engine braking or just let the brakes do their job.

RE: Fuel/Spark Effect On Engine Braking

(OP)
My goal is to have as little engine braking as possible, I have installed a back torque limiter (slipper) clutch on the bike (Aprilia SXV). Engine braking isn't a big deal on tarmac, however riding in the dirt with slicks does get a bit hairy.  

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