Max Advance

[Roy]

Hi all

On the subject of max ignition angle, I agree that
nmore is not better for power, reliability or anything
else.

Basically the time a cylinder needs for complete
combustion of the fuel is constant, you want max
pressure developed on the piston (BMEP) just after TDC
and therefore as the engine speed increases you need
to start combustion earlier so as this can be
achieved.  This is a very simple explanation of why
you need to use ignition advance.

Improving the efficiency of combustion and reducing
the burn time will allow less ignition advance to be
used.

This objectives can be achieved by running richer fuel
air mixtures, increasing turbulence within the
cylinder, using higher compression ratios and smaller
bore sizes with more cylinders to achieve the required
capacity among others.

Hope this helps

                  thanks Roy ( Spectric's Ltd UK )

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