> -----Original Message-----
> From: Alan Gorham [SMTP:alan@MICROTIMA.CO.UK]
> Sent: Monday, May 20, 2002 9:55 AM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      [EE]: Update 2 - Spark ignition for model engines
>
> I ran the engine on glow again to warm it up and to broadly check that the
> mixture was set.
> Then the spark gear was refitted and I began flicking. The engine was
> firing every flick but would not continue.
> Also, about every fifth flick it seemed to backfire and blow air out of
> the carburrettor.
>
> Now bear in mind that I had the ignition timing at 5 degrees after TDC; I
> thought that I might as well try retarding it a bit
> more to try and stop the backfire. I went to 10 degrees after TDC and
> found that the engine would not fire every flick.
> Moving to 15 degrees after TDC the engine didn't fire at all.
>
It sounds like the engine is very retarded.  You wouldn't normaly have a
static advance set anywhere *after* TDC.  Usualy a static advance would be
set something like 5-10 degrees BTDC.

Regards

Mike

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