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General control line discussion => Open Forum => Topic started by: dagored on June 28, 2022, 08:34:48 PM
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Ok were the McCoy red head .35 any good i see allot of these all the time on ebay i know these were all bushing motors, and can buy them at a low cost but do they last .....?
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They were an economy engine and did PK for the money if they were fed proper fuel, prop and glow plug.
Type at you later,
Dan McEntee
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The McCoys were loosely fit to begin with and some had little compression. They have a cintered iron piston and would wear out the fit pretty quickly even if they started out well. Having said that they are a great buy. Many are still quite new since the owners often didn't know how to start or run them and very many were made and sold due to their low price. We have learned that with today's fuels they can run with very little wear and perform well. On the pure castor oil fuel of their era you might get 10 to 20 run-hours before they were shot. Today a mix of 28-30% oil, 50-50 mix of castor/Klotz red oil will make them last indefinitely as long as you don't run them too lean or hot. Many old engines you can buy are frozen in old oil and can be ruined trying to get them loose if not careful. However these old McCoys seldom get frozen due in part to materials and loose fits. I've bought maybe twenty off eBay in the last few years and only two or three weren't usable. You always take a chance when you can't put your hands on them before you buy .
Dave
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Ok so on a gal of fuel with 10 or 15 percent nitro how many oz of castor oil should i ad to a gal of fuel
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Your question is a bit off. You need to know the OIL content- not nitro.
Here is a good calculator:
http://www.nitrorc.com/fuelws/
Dave
BTW. When adding oil add a MIX of castor/ synthetic- like Klotz oil.
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They were so cheap and had very little to no quality control, so we would buy them 4 at a time and mix and match until we got one that had compression. The design was great, it was the execution. So get four and mix parts until you get one that runs right. D>K
Same thing with Fox 35 only had to buy 50.
Motorman 8)
P.S. If there is already synthetic oil in the fuel then only add castor. If you add more synthetic and the two oils don't mix you can ruin the fuel. BTDT
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Ok Thanks guy's for info ...... H^^