Which ignition system for 1/4 x 32 spark plug

[Richard CoxParticipant @richardcox82602]

Hi what ignition system of the rcexl style would you recommend as I can only find ones suitable for the bigger plugs it’s for a Nemett Lynx 15cc

Rich

[Richard CoxParticipant @richardcox82602]

[pgk pgkParticipant @pgkpgk17461]

Any help:

hobbyking

[JasonBModerator @jasonb]

I went with the one from S/S in the states, have used them quite a bit on the hit and miss engines too, they do a nice neat plug boot for the small 1/4 x 32 plugs and small diameter silicon insulated wire not that ugly braided stuff.

You could also look at Minimag's offerings like the MCL1 which would work OK

A lot of of the Rcexl systems have auto advance that does not work well on these engines.

[Roger BParticipant @rogerb61624]

The RCexl systems will work but the sensor needs to be on the crankshaft, not on the camshaft, as these are designed for 2 stoke engines. The wasted spark on the other TDC is not a problem as there is no combusible mixture.

They start with full advance, 28°, which drops to 4° at around 400rpm and then starts rising at 1000rpm reaching full advance again at 4000rpm. This should be ok for a Lynx but is not suitable for low speed hit and miss type engines.

1/4-32 versions are available from Just Engines and I assume other suppliers.

**LINK**

Best regards

Roger

[Richard CoxParticipant @richardcox82602]

Jason the cap and wire is ugly on the rcexl and out of proportion I will have a look into the ss type thanks

Rich

[Richard CoxParticipant @richardcox82602]

Thanks roger relating to the sensor issue I did think of adding two magnets 180 degrees opposed on a disc on the cam and run it as a wasted spark potentially

Rich

[Roger BParticipant @rogerb61624]

The RCexl screened cable and plug cap are probably necessary if you are flying the engine in an RC aircraft but as you say otherwise somewhat bulky.

Best regards

Roger

[JasonBModerator @jasonb]

They use the screen and outer metal casing of the cap as the ground, S/S and Minimag have a separate small wire

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