Eddie Cesnalis Posted September 14 Report Share Posted September 14 What is the mast CHT when using 50/50 Dexcool? Quote Link to comment Share on other sites More sharing options...
Roger Lee Posted September 14 Report Share Posted September 14 Rotax SB says 248F. Then engine is okay with 266F, but the coolant will boil at approx. 275F. That's too close so Rotax brought the max 50/50 temp down. Use the oil temp. Quote Link to comment Share on other sites More sharing options...
FlyingMonkey Posted September 15 Report Share Posted September 15 21 hours ago, Roger Lee said: Use the oil temp. Not sure what you mean...are you saying use the same max temp for CHT as for oil, 266°F ? Follow up question: What would be a "normal" CHT for say a 75°F day? I usually see around 205-210°F in cruise at that temp at 2000-3000ft MSL. That looked a tad hot to me, but maybe it's right in line. When I start the engine on the ground and let it sit and run for a while (say 15-20min) I can see CHTs up to 230°F or so, that then go slowly back down to the above temps once I'm up and cruising. CHTs on the ground often exceed oil temps if the airplane sits idling a while. Quote Link to comment Share on other sites More sharing options...
Anticept Posted September 15 Report Share Posted September 15 If you have the old style cylinder heads, you will read hotter than the new style that goes into the coolant. So that has to be answered first Quote Link to comment Share on other sites More sharing options...
Roger Lee Posted September 16 Report Share Posted September 16 Your oil temp usually reaches max temp before the CHT. Most of you watch the oil temp more than others readings. Quote Link to comment Share on other sites More sharing options...
Eddie Cesnalis Posted September 16 Author Report Share Posted September 16 1 hour ago, Roger Lee said: Your oil temp usually reaches max temp before the CHT. Most of you watch the oil temp more than others readings. That's my experience. I only asked to reset the redline on my dynon. Quote Link to comment Share on other sites More sharing options...
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