cylinder mods - RCCanada - Canada Radio Controlled Hobby Forum
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Old 10-05-2002, 09:38 PM   #1
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I am: Andrew Coholic
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cylinder mods

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I built a nice running 66cc opposed twin gasoline engine last winter, that I flew this summer for a month in one of my own design planes, the AC-2. It ingested something and one cylinder/piston was damaged, and I am finally about to repair the engine (got a new jug and piston).

Question: I plan to reduce the weight by machining the crankcase a bit more, andI was wondering if I should also look at reducing the cylinder's mass as well? They are Tecumseh 2 cubic inch jugs, with fairly heavy cooling fins. I was thinking to try and machine the fins a bit (like you see on some manufactured engines that use Homelite, Ryobi and similar) and also maybe try and thin them out. I just dont want to have any cooling problems. Anyone else try machining some of the fin area away?

Andrew Coholic -MAAC #26287L

1/2A to giant scale, IMAC, SAM, R/C sport, turbine jets, Heli's...
if its got a wing or two and an engine - I like it!
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Old 10-09-2002, 08:30 AM   #2
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I am: Gord C
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You might try cutting the fins down and ducting it like full size aircraft practice. Iuse a snowmobile heat gauge that goes around spark plug gasket on my test stand. Just don't let it go over 350 degrees or bad things happen. Give it a go. Can't tell anything if you don't try it!
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