Brain teaser

[nw208]

Can anyone help a mate of mine, she has got a DNG 1000cc race engine ( for class 1 autograss) that has a misfire, initial inspection revealed that the coil was getting hot, and the plastic bits on the point were melting and closing the points gap. Fellow autograssers suggested a ballast resistor, which improved things, the coil still gets warm (is this normal?) but the engine has a slight misfire when pulling away.

My unhelpful suggestion was to rev it a bit more, which resulted in a swift dig in the ribs for my trouble.

I think, according to the rule book that electronic ignition is prohibited.

Any further help would avoid any more pain in the rib area!

 

[hmalan]

Have you changed the coil when adding the ballast resistor as the coils are specific to whether or not a ballast resistor is fitted.

If you fit a non ballast resistor coil to a system with a ballast resistor the coil will overheat.

Alan T

 

[Phaeton]

If you fit a non ballast resistor coil to a system with a ballast resistor the coil will overheat.

Isn't that the wrong way round Alan, if you fit a ballast coil to a none ballast system it will get hot, 12v through a 9v system. But if you fit a none ballast coil to a ballast system all you'll get is a poor spark, needs 12v to energise but only getting 9v

Other things to look at leads & plugs suspect one might be going HR.

Alan...

 

[nw208]

Thanks for the replies guys, I will pass the message on.

Unfortunately I have been working away for the last few days so I haven't had the chance to try this yet.

Will keep you posted,