Help identifying Throttle Sleeve

ncpiperpilot Tue Feb 06, 2024 10:12 am

Help identifying Throttle Sleeve 20240211

This may or may not be a cox sleeve as I received it in a bunch of mostly 049 stuff. Appears to be a throttle sleeve but has small cutouts for exhaust. ID is 0.57"

Any idea what it's for?

balogh Tue Feb 06, 2024 11:50 am

It seems to be a COX 049/051 size throttle sleeve..If you have a COX 049 cylinder with the stepped wall, or thick wall, removed from the engine, and it fits, then it is for that engine size...a thin wall 049 cylinder is not good for testing, because of the small flange at the cylinder bottom with a diameter larger than the cylinder neck diameter, that will not allow the sleeve to slip on the cylinder neck.

ncpiperpilot Tue Feb 06, 2024 12:25 pm

It may fit a cox, I will pull a cylinder and check. However, I've never see one with openings (basically notches) like that. It's going to evenly restrict the exhaust port until it at the edge of the port. Not like other cox throttle sleeves I have or have seen. How is it going to work well?
Thanks,
Bill

balogh Tue Feb 06, 2024 1:37 pm

Even the genuine COX throttle sleeves will have a rather coarse throttling effect, where you have either full rpm or an idle, with a narrow control band between the 2..it is simple and reliable like a hammerhead, but one should not expect such a fine control by it as with carb throttling of larger engines..

Yours look like #56 in the COX Model Engine Handbook:

Help identifying Throttle Sleeve 17072410

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Help identifying Throttle Sleeve

Help identifying Throttle Sleeve

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