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.70 Surpass II

Old 07-04-2010, 02:12 PM
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Default .70 Surpass II

Hi Bill. Thanks for the great service and advice over the years. Here's a question for you on my LOW-TIME 70 Surpass II. First, it runs fine, is very strong, and I'm running it mounted on a 45 degree angle in a Reactor. Perfect setup. I use Cool Power 20-20 heli fuel, and always run on the rich side. OSF plug, 14-4 APC. I get a great smoke trail among other benefits. Last six flights were great, good power, easy start, etc. I have about 20 flights on this aircraft, and the engine seems to get stronger every outing. However... today, when inspecting the plug and adding after run oil, I noticed a distinct LOUD clicking sound when the piston hit TDC. Turning the prop slowly in both directions resulted in the same sound. The engine turns free otherwise, bearings are smooth, etc. I pulled the valve cover for the first time, and all looks normal. Any ideas or suggestions? What the heck is causing that noise? Should I run the engine?

Thanks again, Tony Iannucelli
Old 07-06-2010, 09:18 AM
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Default RE: .70 Surpass II

Very likely, you are hearing the cam followers come off the cam. It has a steep slope, so the lifters will "fall" when the cam rotates out from under them. A "clinking" noise is common in model four-stroke engines.

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