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Always a latecomer, I have need for rebuild help

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Always a latecomer, I have need for rebuild help

Old 07-09-2009, 09:06 AM
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sdad
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Default Always a latecomer, I have need for rebuild help

After being away from the hobby for a number of years, I am returning with a handful of engines, both 2 and 4 cycle that I have managed to pick up. The first order of business is to clean them up and remove any extraneous metal that won't hurt the case strength, yet shed some weight. This would include carb cleaning. Any comments, pointers, suggestions on tools for metal removal would be welcome. Carb cleaning and disassembly advice would be handy. I would just as soon completely dismantle and then rebuild. Most of these engines don't have flywheels, or have broken vanes, so I am pretty much going to have to go electronic spark. I will need vendors for prop hubs, as I don't have a lathe. As I am going at a bunch of unknowns, should I replace rings and bearings just as a maintenance procedure? Should I hone the cylinder walls?

Thanks
Old 07-09-2009, 09:51 AM
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Edwin
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Default RE: Always a latecomer, I have need for rebuild help

My favorite tool in the shop is a dremel with the 2" fiberglass cutting wheels. It gives me better control at removing metal in tight confines. An assessory would be the right angle gear drive for the dremel which also helps get into areas hard to reach. I use a crock pot with antifreeze in it to clean engines, does a good job and makes most look like new. If your going to do a lot of this, a small lathe would be really handy. I forget the name at the moment but there is a guy that makes custom rings for a reasonable price. Someone else will probably reply with his name. I also use a sonic bath to clean carbs with. I use water and dawn dish soap for cleaning, easier to dispose of. Without that, I had to use B12 spray carb cleaner. Pretty nasty stuff but it does a good job. I would suggest gloves and safety glasses while using it. You have to make some kind of small flywheel/prophub to fit the magnet for the ignition. Thats where the lathe come in. And most crank shafts have a conical cone with a key that the flywheels fit on. I would think you have to get that perfect. I've not had to do that yet. I dont normally replace rings or pistons or even hone the cylinder. I dont get a LOT of power out of them, but enough to do a decent job of flying.
Edwin
Old 07-09-2009, 10:42 AM
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sdad
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Default RE: Always a latecomer, I have need for rebuild help

I spotted a posting on a gas/glow conversion. There is some appeal in that to me. I can ignore all the ignition, and I can standardize on one type of fuel. The ring vendor apparently will be of some help, as I see that ring gap is critical for compression. Thanks for the cleaning tips. A Dremel I do have!
Old 07-09-2009, 03:52 PM
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spaceworm
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Default RE: Always a latecomer, I have need for rebuild help

Here is a note on custom or replacement rings: "Engine Rings, custom made, about $4

Engine Rings, custom made, source 2:

For all of us modelers who need piston rings and cannot find them, try contacting Frank Bowman. He manufactures repro and current piston rings for our modeling needs. He can make standard and Dykes type rings. If he doesn't have the ring you need in stock, you send the piston and cylinder and he will make it then. prices are $7.50 up to $9.50. His work is of the finest quality.

Happy landings, Zach

Frank can be reached at fbowman@acs-online.net or 1-505-327-0696 ( 6pm to 9pm mst. weekdays) and the following address:
Frank Bowman
1211 N. Allen
Farmington, NM. 87401 "

Also, some links for engine conversions gas to glow, ignitions, etc:
http://www.carrprecision.com/
http://www.ch-ignitions.com/#cat
http://www.rcuniverse.com/forum/m_87...tm.htm#8754147
httpjagengines.com2instructs.htm
http://www.google.com/search?q=small...&start=10&sa=N
Old 07-09-2009, 05:13 PM
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rangerfredbob
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Default RE: Always a latecomer, I have need for rebuild help

I mainly use a hack saw to cut stuff, it takes a lot of aluminum to add up to weight savings, so you don't have to go nuts on it...

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