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.  At low power settings (about 6 gph fuel burn) the water temp is about 15 degrees higher than it used to be.  Oil temp is same as before.  I have almost exhausted all my ideas on what is causing this.  I am fairly certain that the cooling system is actually dissipating more heat at any given power setting than it was with old engine.

 

There are a few clues that lead me to think that it may be the longer (and additional) exhaust path through the block that leads to the higher coolant temps.   One of them is that the higher temps don't seem to be causing a problem since the temps don't seem to go up as much when power is added.  I.e., the old engine would heat up about 30 degrees when going from low power level flight to high power climb and the Renesis will go up about half that so that they end up being about the same.  Still, it's very disconcerting to see them up so high to start with.  Another clue is that the coolant temp after the rads is about the same as on old engine (higher coolant temp delta through rad).

 

Have you heard any feedback from Renesis racers (are there any?) indicating higher coolant temps?

 

Tracy  (hoping I can ignore the temps and get on with other stuff)

 

PS:  Going through a website server change so it's down for up to a week or so.