Piston ring gap?? - RCCanada - Canada Radio Controlled Hobby Forum
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Old 01-02-2004, 02:12 PM   #1
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Piston ring gap??

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I was given used Super Tigre 40 that has worn out piston ring. (Possibly) After running a honing tool through the cylinder, I did not see any low spots or scratches on the inside wall. When i inserted the ring into the bore, I measured the gap at about 0.010 inch.
I had to flood the motor to start it and it never kept running. When turning the prop by hand, there was almost no compression.

Does anyone have any experience with worn out Tigres?
Thank you, Jan :
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Old 01-02-2004, 03:24 PM   #2
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You "MAY" have taken too much off the sleeve. You did not say if you purchased a new ring for it ... if its the old one, try replacing with a new one ... Frank Bowman in TEXAS does a fine job of manufacturing after-market rings.

I have NEVER used a honing tool to clean a sleeve .... ONLY a VERY VERY VERY fine emery cloth in a cross-hatch pattern.
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Old 01-02-2004, 05:33 PM   #3
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piston ring gap??

Hi, I agree with you. Using a honing tool for final finish would be fairly rough touch for a cylinder wall! But since I did not have any suitable measuring tool, touch up with three rotating stones gave me some idea about the condition of the bore. I will contact Frank Bowman and get a new ring from him, as you suggested.
Thanks! Jan
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Old 01-02-2004, 05:50 PM   #4
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.010" gap is WAY too much. 1 to 3 thou is fine, better to have 1 or 2 at the most in that size engine.
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Old 01-02-2004, 07:26 PM   #5
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I have dealt with Bowman several times as have others here in the Soo and he is a master at his trade at a more than fair price.........he makes a properly overlapped pin ring for Ryobis for example that have a dramatic affect on the CR because the ring seals much better than stock......
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Old 01-03-2004, 12:18 PM   #6
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You might also check to see how much play your piston has now after you honed the cly. If you have a lot of rocking in it a new ring won't help that much. Just a thought.
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