BIG DAMAGE By Lugging at LOW RPM? Eco Driving Warning! (Manual Gears)

[Logic]

Originally Posted by Ecky

Most modern engines do have offset crankshafts to mitigate this. In my particular example, when the piston is at TDC, the crankshaft is already 12 degrees past vertical. In addition, at low RPM, you see positive ignition timing - which is to say, the spark plug fires even later than that.

As you've said, in a traditional engine, you might fire the spark plug as much as 45-60 degrees before TDC, because combustion is slow, and it takes time to build pressure, and you want to position peak pressure to be most advantageous. In a modern fast combustion chamber (again my case) Honda isn't firing the charge until the crankshaft is 22 degrees (+/-) past the top - and that's when pressure starts building. Hence my point about engineering around issues. If you are burning your fuel 80 degrees later than in older engines, you're moving all forces entirely past the damage zone. Which is already being done.

Thx for the info Ecky.
Offset and low rpm timing retard are obvious solutions to me, but I am certainly not up on the latest engine/s developments.
Good to hear that my (educated) guesses at solutions are in fact being implemented!

Pity my solution to the increased mixed and boundary lubrication (and turns blowby water into a 'friend') is considered my one 'Loony Tune' here.

Originally Posted by Ecky

The key is to be able a to make combustion fast enough that little to none of it needs to happen before the crank is vertical.

I have written extensively on Ozone addition here.
This can be be done in multiple ways, including ones that have fast burning H2 and elimination of intake tract boundary layer as a 'byproduct'.

Basically you get a bit of cold oxidization of the fuel starting when the Ozone and fuel 1st mix during the intake stroke, making the remaining hot burn much quicker.