Hub For Large Splined Crankshaft Needed

NEW222 Sun Nov 24, 2019 6:33 pm

Hi there. Sorry as I know this had been posted before somewheres and cannot find it, but does someone happen to remember what drive hub I would need if I wanted to convert my car engine to run with a propeller? It has a large splined crankshaft. The engine came from a Cox car if that helps know what I need. Thank you.

Marleysky Sun Nov 24, 2019 7:23 pm

Here you go. Jason did it!

https://www.coxengineforum.com/t2503-cox-car-crankcase-with-large-splined-crankshaft

Oldenginerod Sun Nov 24, 2019 7:30 pm

$4.95 currently from Matt at Ex Model Engines. Bernie doesn't show any.

NEW222 Sun Nov 24, 2019 8:08 pm

Thank you. I knew I saw it somewhere here before, but had no luck finding it. At least I now know what I need when I fix up the engine.

crankbndr Mon Nov 25, 2019 7:35 am

EX was working on the tapered cranks not splined

http://www.exmodelengines.com/product.php?productid=18246&cat=266&page=2

Maybe you could open the hole in a drive plate and press it on

I see Jason used an .09 drive plate

or you could change the crank to tapered

Oldenginerod Mon Nov 25, 2019 3:53 pm

crankbndr wrote:I see Jason used an .09 drive plate

That's the one I referred to in my last post, not the tapered .049 one.
http://www.exmodelengines.com/product.php?productid=17578&cat=254&page=1

NEW222 Mon Nov 25, 2019 4:07 pm

Thank you for the opinions and suggestions. I am glad you had brought up opening up a driveplate, as I was wondering myself if that would work. I would think if one did it carefully, it can be done as it is soft metal. Or even possibly making one from aluminum as I had made a tapered one before. Going to play around with it and the ideas over the next while and see what I can come up with. Great fun, little projects. Gotta love them.

Jason_WI Mon Nov 25, 2019 10:33 pm

An .049 drive plate that’s drilled out will work if it’s hole is center drilled correctly. The drive plate will be smaller than the face of the crankcase nose. I used the Medallion .09 drive plate as the spline is the exact size. I turned it down on the lathe to match the crankcase size. I also added a brass washer to take up crankshaft end play on the one engine in the linked thread.

NEW222 Tue Nov 26, 2019 7:16 pm

Thanks for chiming in here Jason. That is one thing I read is that you had turned it down with a lathe. I unfortunately do not have one, now would I even know how to turn one on.... Anyways, thanks for your opinion on drilling out an existing backplate. I may even hunt down a piece of aluminum and try something on my drill press for fun in the spring. Heck, I made one for a tapered engine already, once, and seems to work, so I have absolutely nothing to lose. On the bright side, I will always have a piston and cylinder set as a spare set.

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Hub For Large Splined Crankshaft Needed

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Re: Hub For Large Splined Crankshaft Needed