Recommended spark gap ? - Page 2 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 12-25-2003, 01:00 PM   #11
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John, No I dont do much maintenence at the field.... except if I am at a fun fly. Once I worked 3 hours to get my turbine back into the air (stripped the steering servo and badly bent the gear) but I flew again later in the day!

Engine maintenence I do at home....
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1/2A to giant scale, IMAC, SAM, R/C sport, turbine jets, Heli's...
if its got a wing or two and an engine - I like it!
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Old 12-26-2003, 10:10 PM   #12
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Hi Guys,
Checked my 3 Homlite books and they are all 25 thou. Probably good to stay there and check to see how it burns after a couple of good runs.
John Davidson
Keep the shiny side up and the wheels down
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Old 12-27-2003, 01:03 PM   #13
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.20 to .28
most magneto ignitions like .20 to .23, some electronic ignitions are prescribed at .28

The reason for the larger gap with some electronic ignitions is, that there is less spark oscillation, but rather one single hot spark. The spark then must be longer (larger) to dependably ignite the mixture, whereas the magneto ignition has a series of oscillating sparks.
If the first fails to ignite the mixture, then the second or third spark will do the trick, because by then, the mixture at the plug tip is fully ionized. In this condition, the mixture will easily allow the next spark, and react with anything in reach; Thus combustion is induced in a very dependable way.
Best regards.

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Old 01-14-2004, 07:20 PM   #14
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Hi guys ;Thanks to all who gave input.

I e mailed Zenoah/ Horizon to their tech support and they just got back to me; the day after I e mailed them.

They say the spark gap for a G-62 should be 25 - 30 thou .
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Old 01-14-2004, 07:52 PM   #15
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The spark gap can be bigger in the cd ignition engines because they produce more current that can jump a bigger gap, the longer thge spark the better the burn, the magneto ignitions don't put up as much, therefor ethe spark gap must be closer to keep the spark hot enough.
There is no such thing as too low
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