According to the book...582 max take off RPM 6400...sounds like your over pitched....is your throttle fully opening????
Are you in a hot climate Ian....and do your rads get a good airflow....I have one of those hand held laser thermometers...its very handy for a second guess as to weather your gauge is giving correct info...there very cheap on ebay these day...I also have a laser tach again ebay to confirm my tach is right....my a/c tach over reads by 5%,
To much pitch will over load your motor and make it tend to run rich with lower EGTs...to fine tends to make it run weak and give high EGTs,
Are you using the correct grade and type of coolant...it makes a difference to heat transference,
You can test your stat in a pan of water bring it to the boil with a thermometer in the pan and noting at what temp it opens.
Clarification: We are talking about the latest model Rotax 582 48kw 2-stroke engine
1) My Operators Manual in page 10-1 says Take-off speed 6800RPM max. 5 min. Cruise speed 6500RPM. (Cruise speed seems high to me but that's what it says). Throttle is fully opening when checked with airfilter removed and engine off. It does sound like an overpitch scenario but 12* should not be overpitched. Surely?
2) I fly from the wheatbelt area of Western Australia where the temperature on Sunday was 32* celsius. There are many aircraft flying in WA that do not overheat like this one does. The radiators straddle the reduction box and are out in the breeze just behind the propeller. I'll check out Ebay for those devices too.
3) I was certainly of the opinion that this was an overpitch situation until I inspected the pitch blocks and found they were 12*. I understand another aviator with my same configuration was overpitched at 16* so changed to 15* and achieved 6800 RPM. I'll be changing the spark plugs this weekend so will inspect for running rich scenario.
4) Coolant is as per specs in Operators Manual and mixed accurately 50% coolant - 50% demineralised water.
5) I'll pull the thermostat on the weekend and check it out when I also check the sender/wiring/temp gauge for correct operation. I have 2 separate thermometers that I will stick in the water for checking against. My Rotax Repair Manual says the thermostat should open at 55*-60* celsius. Do you agree?
Thanks for your suggestions people, I will report back here after the weekend.
Cheers,
Pud
Before you get too much further along try this test. It doesn't cost anything, but a little time. Add a little pitch back in to get 6500 max WOT in flat and level flight. Then cruise around 6100-6200 and see what you get. Too little or too much pitch can cause higher temps. This may help. Don't get too hung up on the take off rpm.
Roger Lee LSRM-A & Rotax Instructor & Rotax IRC Tucson, AZ Ryan Airfield (KRYN) 520-349-7056 Cell
Trouble is I need 11* pitch blocks to reduce the pitch Roger - don't have any at hand so won't be able to try your suggestion.
I have plenty of suggestions from you guys to work on so I'm going to start on these to eliminate possible culprits!!
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