Four Cylinder Ignition

[Peter Smedley]

I'm thinking of converting a 4 inline glow motor to gas. However it needs a four line ignition module.
Can I string two dual ignitions together????
If so how can it be done?
Thanks

[David Brown]

It will depend on the firing order, are they 4 stroke or 2 stroke. If two fire together then I would say yes but if they fire at 90 degrees then no. Four single units would do it, I use singles on my inline engines.

Dave

[Peter Smedley]

Sorry forgot to say that they are four strokes..I can find out the firing order tomorrow but I think its 1342

[Alan Cantwell 1131]

Gas? Do you mean petrol?

[Peter Smedley]

Yes...copy and pasted from another site!

[Peter Smedley]

BTW.....I was going to convert this 30cc glow DOHC. Home made

[Peter Clare]

Most 2 stroke twin cylinder petrol engines have both cylinders firing at the same time. You could therefore use two of these ignition units. one connected to cylinder 1 and 4 and the other connected to 2 and 3. two hall sensors and two magnets would be needed , one at. 30 degrees before top dead centre for no1 cylinder and the other at 30 degrees before top dead centre for no2 cylinder ( ie exactly 180 degrees apart).The magnets would need to be separated lengthwise on the crankshaft to avoid interference between them. The distance required could easily be checked by trial and error.
The fact that each cylinder would get a spark every revolution would not matter because the redundant spark would occur at the end of the exhaust stroke when there is nothing to ignite in the cylinder. Adjustment of the hall sensors either side of the 30 degree position should find optimum timing position - usually a bit retarded from max rpm available.

[Peter Smedley]

Super, thanks for that