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At 08:02 PM 9/18/2004, you wrote:
We're work'n you overtime Lynn, hope you got time for one more.
I'm almost out of ideas on what is driving the water temps up on my Renesis installation. It has the same cooling system as on the 89 vintage engine I've been flying for the past 4 years or so.
I'm no expert by any means, but the higher water temps do not surprise me.
As I understand it, the exhaust porting on the Renesis is completely different than the 13B. The exhaust runs much cooler in the Renesis because of this, so I'm told. It is likely that a significant fraction of the heat that is not going into the exhaust is going into the water jacket instead.
The car folks probably won't sense much of a change in water temps because they typically have a lot of margin in the cooling system. You, on the other hand, have a cooling system that has very little (if any) extra capacity.
I haven't seen anyone do this, but I would think that it would help the cooling if an effort were made to course the cowl air close to the engine cases and/or the oil pan instead of just letting it blow anywhere it pleases inside the cowling. A finned (or ribbed) oil pan might help too without adding much weight.
It sounds like you are not after much additional cooling, so small changes like these might be enough.
Bill Dube'
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