Dabusmith(at)aol.com
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 Posted: Thu Jan 18, 2007 11:34 pm Post subject: A new Evans Question and 912 vs. 912S |
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I have never had an issue with water temps on my 912S. I switched to Evans as recommended by Rotax and did notice a few degrees increase .I flew in a 701 with the 912 engine having high water temperatures caused by not having enough exit area under the cowling. It was cowled so tight on the bottom there was maybe a one inch gap around the nose strut. He considered 260 deg. oil temps the upper limit and that Rotax just kept humming along.
Oil temperatures can stray above 230 deg. in a climb over a mountain in the summer with the stock oil cooler. The larger oil filter offered by Lockwood cures the problem. The larger cooler and the oil thermostat
were worth every penny.
My 912S was very abrupt at start up and shut down. It is now tamed. The original starter sprag clutch was apparently manufactured at the limits of allowed tolerance. Changing to the new starter didn't help. The sprag clutch change was dramatic. I wonder how many of you need a new sprag clutch. The other change was to lower the idle RPM. I still idle the engine at around 1900-2000 RPM but at shut down I pull the idle way down before switching it off. Nice and gentle now.
I would like to know who has the most hours on a 912S. I knew a fellow with a 912 powered Rans S-10.He had 3400 hours on it. Never overhauled. He claimed it hasn't changed since it was new. He reportedly flew back to Georgia from Sun n fun at 5800 RPM the full way. No problems ever. Are there other examples? I have never heard of a properly maintained and setup 912 or 912s having any significant problems like cylinders or crankshafts. I have seen some engine installations that led to cooling, oil supply or fuel problems. Many people have chosen another engine based on experiences with the 2-stroke engines. Some will claim problems with the radiators and gearboxes but have no specific examples to point to. Do the aircraft manufacturers have some reason to choose the 912S so often? I would think the Jabiru would be ideal for the RV-12. Any ideas? BTW the 701 with the 912 is GREAT. With the 912S it's GREAT!
Dave Smith
701 912ULS 620 hours
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