Small ignition
04-15-2012 | 06:51 PM
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From: San Tan Valley,
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Small ignition
I just came home with one of those new Chinese 15cc engines. Its an RCGF and seems to have good reviews.
I have to wonder about the ignition system though. Its almost bigger than the engine itself.
When I was a kid we had ignition systems. They consisted of just a small coil and a very tiny capacitor. And they needed only 3V to operate. Have we made progress?
I have one of those made for a replica Super Cyclone. I will use it if I can figure a simple way to rig points on the engine.
Its time for some sharp designer to devise a new small ignition.
I have to wonder about the ignition system though. Its almost bigger than the engine itself.
When I was a kid we had ignition systems. They consisted of just a small coil and a very tiny capacitor. And they needed only 3V to operate. Have we made progress?
I have one of those made for a replica Super Cyclone. I will use it if I can figure a simple way to rig points on the engine.
Its time for some sharp designer to devise a new small ignition.
04-15-2012 | 07:24 PM
#2
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RE: Small ignition
Those old points engines didn't have the auto advance that is built into most all of the current electronic ignitions. In fact, they didn't have carbs. Just a wide open intake and a spray bar. Get it running, and adjust the ignition by ear and launch straight up, or if you were flying CL, let her rip. In either case, WOT and dead stick landing. Some years back, the CDignition was adapted for RCuse. The trouble was there was no automatic advance, so a mechanical advance needed to be incorporated. The auto advance on the current crop is head and shoulders above either.
If you were to modify the engine to use points, the Coil, Capacitor, and batteries would be near the same size as a battery and electronic ignition of today. The noise off the points spark setupwould drive our radios nuts. There were no shielded plug wires.
The RCexcel Ignition modules I have are the same size as the old school CDmodule.and seperate coil. and not much bigger than the old point and coild setup.
Don
If you were to modify the engine to use points, the Coil, Capacitor, and batteries would be near the same size as a battery and electronic ignition of today. The noise off the points spark setupwould drive our radios nuts. There were no shielded plug wires.
The RCexcel Ignition modules I have are the same size as the old school CDmodule.and seperate coil. and not much bigger than the old point and coild setup.
Don
04-15-2012 | 07:42 PM
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From: San Tan Valley,
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RE: Small ignition
The coil I have is much smaller than the RCexl that came with the engine.
You do not need an auto advance system with the small engine. You can start it with the engine advanced. I have a DLE 30 that I smashed the ignition and replaced it with an XYZ ignition I got from HK. It has no auto advance circuit. I have no trouble starting it with a starter.
The spark noise from ignition does not affect our 2.4 systems. I have tested that with the XYZ system. I sat the XYZ system with spark plug and a non shielded lead next to one of my 2.4 systems and drove it with a function generator. With the spark plug sparking like crazy completely in the open(not screwed in to the engine) there was no change in the operating range of the 2.4 system.
You do not need an auto advance system with the small engine. You can start it with the engine advanced. I have a DLE 30 that I smashed the ignition and replaced it with an XYZ ignition I got from HK. It has no auto advance circuit. I have no trouble starting it with a starter.
The spark noise from ignition does not affect our 2.4 systems. I have tested that with the XYZ system. I sat the XYZ system with spark plug and a non shielded lead next to one of my 2.4 systems and drove it with a function generator. With the spark plug sparking like crazy completely in the open(not screwed in to the engine) there was no change in the operating range of the 2.4 system.
