WestCoast Posted August 31, 2006 Share Posted August 31, 2006 Iam not sure if anyone else has had the "too cool" problem with their Rotax 912S temps however this has been a problem with mine as you willsee from the engine log figures below.(where there have been two pick ups for a parameter, I have averaged the reading)<?:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /> Alt 5500 ft RPM 4600 MP 810 FF 19.5 LPH OAT 8C TAS 115 EGT 770C CHT 75C OIL T 76C Alt 4500 ft RPM 4800 MP 860 FF 22LPH OAT 11C TAS 117 EGT 776C CHT 80C OIL T 81C RPM 4670 MP 830 FF 19.5LPH OAT 11C TAS 115 EGT 790C CHT 80C OIL T 77C RPM 4590 MP 830 FF 20LPH OAT 10C TAS 115 EGT 786C CHT 78C OIL T 75C Alt 2500ft RPM 4710 MP 910 FF 21LPH OAT 8C TAS 115 EGT 809 CHT 74C OIL T 70C My CTsw came from the factory in May 06 with 50% BASF Glysantin Protect Plus coolant & 50% water. I have just replaced the coolant at the first 25 hour service with Evans NPG+ (as recommended by Rotax in the 912S manual) and what a difference it has made! I flushed the system twice using the Evans prep fluid (4 litres in all) and then added the Evans NPG+ at 100% as recommended. CHT's are now sitting around 107C and OIL temp at 90C during cruise...when you compare that to what I was getting previously....the change of coolant appears to have solved the problem. Figures after Evans NPG+ added:- Alt 5500 ft RPM 4540 MP 824 FF 19.5 Lph OAT 15C TAS 115 EGT 746C CHT 107C OIL T 90C Alt 4500 ft RPM 4500 MP 850 FF 20 LPH OAT 17C TAS 115 EGT 765C CHT 108C OIL T 85C Regards Dave. Link to comment Share on other sites More sharing options...
Paul Willett Posted August 31, 2006 Share Posted August 31, 2006 I had about a 15 degree rise in CHT when changing to the Evans. On a Tecnam Airframe. Link to comment Share on other sites More sharing options...
WestCoast Posted August 31, 2006 Author Share Posted August 31, 2006 Thanks Paul.....have you only recentlychanged over to Evans NPG or have you been using it for quite a while? I would be interested to know how the CHT behaved over the hottest months during summer. Thanks Dave Link to comment Share on other sites More sharing options...
Paul Willett Posted September 1, 2006 Share Posted September 1, 2006 Dave, I changed to Evans in February and have always remained in the green arc - although I tend not to fly on really hot days through choice (turbulence / comfort etc.) Link to comment Share on other sites More sharing options...
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