Puffs wrote:Breakwellmz, ta, that's what I suspected.
Then I might suggest another explanation why it seemed to deliver more power: maybe your dynamo was acting as an electric motor, assisting your 350 twin? I'm not entirely certain it would do that, but it is certainly possible. Have a look at the schematic of how you switched it.
Guesi, thanks for that graph. Google tells me the Finnish title is something like 'Guesi ignition unit advance operation', and on the y-axis it's degrees, and on the x-axis engine RPM. Yes it is an advance curve, showing 0° advance below 1000RPM, then a linear increase to the factory-prescribed 22° (=3mm) advance at 2000RPM, and thereafter it stays constant. That might help if you have a problem with the engine kicking back while starting it, but: No, that is not what I am looking for.
What I'm looking for is an advance curve that gives more advance when the RPMs rise. The time it takes the crankshaft to rotate over a set number of crankshaft degrees (or mm advance ignition) reduces when the RPMs increase. The flame front, however, has a constant velocity, and consequently the ignition needs to happen earlier at higher revs. That is what none of the commercially available systems do, to my knowledge.
The pruducer of the ignition can program any advance of the ignition he wants.
But as a commercial product, you have to give guarantee for the product.
So it is the safest way to program it as near to the original data as possible.
And knowing the ideal timing in each rev. situation need a lot of testing...
