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reduce rpm with carb restictor? Empty reduce rpm with carb restictor?

Post  chevyiron420 Tue Feb 14, 2023 7:50 pm

I am currently performing some experiments with my testors mccoy 049 and I need to slow it down some. Its over reving even with a 6x3 windsor prop. Has anyone had any experience on this?
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Post  Michpatriot Sat Mar 04, 2023 5:23 pm

I've often thought of doing the exact same thing..maybe a small washer over the venturi opening and then retune the needle.
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Post  sosam117 Sat Mar 04, 2023 5:45 pm

chevyiron420 wrote: I am currently performing some experiments with my testors mccoy 049 and I need to slow it down some. Its over reving even with a 6x3 windsor prop. Has anyone had any experience on this?

I don't know what the venturi looks like on a Testors McCoy 049 but on the Enya engines there is a sleeve tht slips into the inside if the venturi to reduce the intake size.

Maybe this could be done with your McCoy 049 with a piece of brass tubing?
See or find a way to slip a brass sleeve into the venturi?

If I remember correctly the needle valve assembly doesn't come out of the venture because it's press in?
Cut a slot in the brass tubing to maybe slip over the needle valve assembly in the venturi?

You could leave the tubing sticking out from the venturi and add smaller brass tubing in the section sticking out until you get the speed you want while inserting small and smaller tubing in the original tubing sticking out of the venturi?
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Post  Ken Cook Sat Mar 04, 2023 6:55 pm

Try and add a head gasket or two. Drop your nitro to 10% and increase your oil to 25%. It will certainly drop the rpm's without compromising the fuel running through the engine that keeps it cool.
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