Short or Long? - RCCanada - Canada Radio Controlled Hobby Forum
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Old 07-19-2011, 06:35 AM   #1
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Short or Long?

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Boy do I feel dumb.

I have been flying Glow powered engines since 1995 and I just made a really basic mistake...

I have been trying to get a Supre Tigre 45 running for the last two months - tune the low end - tune the high end, change the seals, change the fuel lines change the glow plug etc. The engine would run, but then over heat, or bog down with too much fuel in the crankcase - always something..

While at a fun fly the other day the local Engine Guru asked if I had changed the Glow Plug - "OF COARSE!" was my indignant reply.

I pulled the plug to prove how well it was working ... and noticed ... that I had just pulled a brand new 'SHORT' Glow Plug out of an engine that required a 'LONG' Glow Plug...

After the new LONG Glow Plug was installed - the engine tuned up in a flash and I had three flawless flights.

Always learning...
Life is either a daring adventure...
...or nothing.
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Old 07-26-2011, 06:31 PM   #2
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Re: Short or Long?

I have a Magnum .10 motor which is a size that I like to fly. It never started easily or ran good either. It still isn't too good. It looked like it took a short plug from looking at the top so I used a short. I looked at it when I took the head off I noticed it was too short, so I took a long plug and it was too long. I put two washers in the long plug to make it flush and it ran ok. Then I found out about the OS plugs being in between the long and short size. What were they thinking? Everyone likes their plugs but they don't even go flush with the bottom of the head. They seem to work ok though. It used to be that the .15 and smaller motors used shorts and everything else had longs, although I never saw an .049 even with shorts. I have modified some Cox .049's to use shorts and taken off 1/16th of an inch off of .15's to go a bit faster. They are easier to strip though. I have to use the lathe once in a while. Nelson plugs or 'turbo' plugs run faster too because of a better seal near the bottom of the thread. Now every time I get another motor I remove the head and check the plug depth to see what reach of plug is needed. I was even thinking of taking off 1/32th of an inch off all of my long reach heads to use the OS plugs but I have too many other plugs to use up, and OS plugs are overpriced anyways and I have heard the quality has gone down too. I don't know why OS makes "short and a halfs" and some of their motors even take longs. Just confusing.
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Old 08-14-2011, 05:01 PM   #3
Gary Maker
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Re: Short or Long?

Well, better a short plug in an engine that requires a long plug than a long plug in an engine that only uses short plugs! I too found that out the hard way!
Stoney Creek Hawks RC
MAAC No. 43659

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Current builds: 1/4 scale J3 Cub & Neiuport 17 and KMP B-25.
Currently flying: Scratched Tele 40, Parkzone Stryker & 60" SPAD Debonaire


"Time flies like an arrow - fruit flys like a banana." Groucho Marks
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