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"COX Budapest" .049 engine



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Post  Cribbs74 Tue Apr 09, 2013 1:57 pm

Matt sent this .010 to the TD tach race and it was a DNF. I did not have a chance to mess with it then and I felt bad so I had him send it back to me. The crankcase was drilled for pressure and it was an obscenely big hole. Matt had already plugged the fitting so I can only assume the carb bodies are not air tight or the volume around the inside of the carb body is to large to maintain adequate pressure. At any rate I JB'd the crankcase and here is the result. Thanks for letting me experiment Matt!

Ron

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Post  RknRusty Tue Apr 09, 2013 2:08 pm

Those things are just freakin' amazing, scary little suckers. Matthew will be glad to see that.

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Post  Cribbs74 Tue Apr 09, 2013 3:59 pm

RknRusty wrote:Those things are just freakin' amazing, scary little suckers. Matthew will be glad to see that.

Yeah they are pretty cool. Scary..... Yep! Let me tell you, those darned props bite me every time I needle one. This one was no exception.

Ron
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Post  microflitedude Wed Apr 10, 2013 12:26 pm

Thanks again Ron for troubleshooting it. I just assumed that the carb was airtight.

I'll have to run it and make a video when it gets back. Who knows, maybe it will see some airtime! Smile
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Post  Cribbs74 Wed Apr 10, 2013 12:37 pm

microflitedude wrote:Thanks again Ron for troubleshooting it. I just assumed that the carb was airtight.

I'll have to run it and make a video when it gets back. Who knows, maybe it will see some airtime! Smile

You're quite welcome Matt. I was glad to help. I do hope it sees some airtime.
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Post  Jason_WI Wed Apr 10, 2013 9:08 pm

I just had to JB weld a crankcase hole in a .010 and a .049. THe .010 hole was at least 1/16" in diameter and drilled at an angle. What did that engine tach at? Sounds like upper 27k to 28K.
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Post  Cribbs74 Wed Apr 10, 2013 9:14 pm

Jason_WI wrote:I just had to JB weld a crankcase hole in a .010 and a .049. THe .010 hole was at least 1/16" in diameter and drilled at an angle. What did that engine tach at? Sounds like upper 27k to 28K.

Don't know didn't tach it. Sounded good though.
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Post  RknRusty Wed Apr 10, 2013 10:41 pm

microflitedude wrote:Thanks again Ron for troubleshooting it. I just assumed that the carb was airtight.

I'll have to run it and make a video when it gets back. Who knows, maybe it will see some airtime! Smile
Check and make sure whoever tapped the crankcase didn't bore the venturi too. I'm guessing not, since it obviously wasn't struggling to draw fuel, but still a good idea to check.

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Post  microflitedude Wed Apr 10, 2013 10:59 pm

I'll tach it. I'm gonna need another set of hands. Very Happy
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