By: jayemm74 - 3rd January 2011 at 16:48
Just a small point, detonation and pre-ignition are different phenomena. It’s an interesting subject and rather than explain it myself, here’s a professionally-written link that should answer any questions:
http://www.google.co.uk/url?sa=t&source=web&cd=1&sqi=2&ved=0CBsQFjAA&url=http%3A%2F%2Fwww.contactmagazine.com%2FIssue54%2FEngineBasics.html&rct=j&q=Engine%20Basics%3A%20Detonation%20and%20Pre-Ignition&ei=ePwhTeLyF6GqhAfwrYi3Dg&usg=AFQjCNEJD3iz0SgR1feaMm6dayiYpbN5sQ&sig2=I9HKvGusHZ-dstdG0p1nUw&cad=rja
🙂
By: low'n'slow - 2nd January 2011 at 20:59
As both Vintac and Rich have said advancing the ignition reduces the risk of damage from detonation at higher power settings.
Retarding the ignition minimises the risk of back firing at low power settings which can in particular cause damage to the gear drives to the magnetos.
By: vintac34 - 2nd January 2011 at 13:31
In a nutshell!! Gives a softer i.e less lumpy idle,also with the further retard from the impulse mag.eliminates/reduces kick back on start!!!
As regards modern engines,well not really interested anymore,stick with the older generations!!
By: richw_82 - 2nd January 2011 at 09:46
Sounds the same as on car engine, the spark is advanced the faster the engine is going. Its usually to keep the engine from detonation under load.
Detonation can damage an engine, and if severe enough or sustained can make it difficult for the engine to pick up again, or even make it stop.
Any help?
Regards,
Rich
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January 2, 2011 at 1:04 am