Hello,
I hope no-one objects to me resurrecting this post, but I see the question was never completely answered.
I was reviewing old posts trying to bring up my education level on these singles. I thought of fitting an Oil Temperature Gauge to the C5.
So when I read this post my concern lies not really in the Tap off Points, but more so why a stock engine being run in the environment for which it was designed would need a cooler if the engineers felt that the engine could adequately cool itself by its design. The original poster indicated his Engine temp was above the flash point of the oil. Unless the engine had been modified, I should think that there would be an underlying problem causing the excessive heat. That probem should be identified.
I have seen times that folks put oil coolers onto Air Cooled engines because they think that they need them, only to bring the oil and possibly the engine down below the optimum operating temperature. This can add sludge to the oil, perhaps keeping it too thick to circulate adequately producing hot spots in the motor. In an air cooled engine the oil system is a critical component in the engine cooling process.
When I am not in the wind on the ground, I am in the wind in the air. I fly a Powered Paraglider that is largely home-built, by me. For a power plant I used a Briggs & Stratton V-Twin Generator Engine. The Engine came stock with an external spin on filter and oil cooler. After mounting it in front of a 64 inch propeller and only flying for and hour or two on cool evenings my temperature gauge (oil temp gauge) indicated that my motor was not even generating enough heat reliably dry out condensation in the crank case. Obviously a potentially catastrophic condition to any engine, let alone one in the air. So to rectify the problem, I insulted the spin on filter and bypassed he cooler. Since I am using the engine for a purpose other then the one it was designed for so (short runs and running in a cool environment) the design needed to be addressed.
I know there is not a lot of historical data regarding our UCE Engines, but I would like to hear the thoughts of anyone with some knowledge on this topic. I have read chinoy's posts here, and he clearly is very knowledgeable, and I am sure in his particular application he is right, but I think the topic warrants more conversation.
-Quinn