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Engine basics => Engine set up tips => Topic started by: Motorman on September 30, 2018, 09:41:12 PM
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The "crock pot" (I use an old coffee percolator) antifreeze soak on my McCoy Red Heads removed the red paint from the head. I use Mothers Mag and Aluminum Polish to clean up the aluminum surfaces on my Enya, McCoy and K&B aluminum parts and mufflers.
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MM - I've refinished a number of McCoy and K&B heads.
I use any general purpose aerosol enamel and I heat-cure for about an hour with a 100 watt light bulb.
Important that the head is absolutely clean and dry.
Never had a problem with discoloration.
By the way, on the K&B 09, I eliminate the head gasket and seal the head with silicone sealant. This yields noticeable increased power.
Bob Z.
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I just looked in my junk box because I thought I had a new one. I have two brand new ones, but one is a 15 and the other is a 19.
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I had a Testors McCoy .35 Red Head turn from red to black in short order. Engine was run rich, used a 10x6 prop, so I wasn't abusing or overheating it. Appears the previous owner repainted the head in a non-heat resistant paint. Could it be that the darkening of your Torpedo's head was the result of the same? Once you get the paint removed, you can repaint it with a good quality heat resistant paint like some auto engine paints.
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Correct!
I should have mentioned that the heads I painted with enamel were primed first with a primer recommended for high temperature.
You can buy red caliper paint at any car parts store and it also works quite well.
However I've never seen green.
In any case, try the enamel- spray on two or three light coats after a light priming. Heat cure and you should be good to go.
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If you lookin the OTS section under "Smaller planes" you can see the head of my K&B 09. Minimal discoloration after many flights.