582 Blue head overheating problem
in 2 Stroke Technical Questions
13 years ago
OK, some issues here I'm hoping you can help me solve
I have a brand new Rotax 582 on my T500 Thruster, the engine has just turned over 25 hours on the clock. It is driving a 68" 3 blade Brolga prop with 12 degree pitch blocks through a "B" reduction box at 2.58. Now this engine has always tended to overheat from run-in on. I have a hard time keeping the temps below 80 degrees indicated on a brand new VDO gauge connected to a brand new sensor in the engine head, all connected together with the wiring that came with the unit. So, unless the new gauge is faulty, I think the temp gauge is reading correct. I will, however, double check this next time I'm at the airfield by sitting the sensor in a pot of water and heat it up. I'll cross reference the temp gauge reading with a thermometer. I have only just pulled the prop[ apart to check the pitch, and I must say I was surprised to see such a fine pitch. I was expecting something near the high side of the range, around 16 degrees. I thought the overheating would be caused by too coarse a pitch setting and I could reduce the over temp reading by reducing the pitch - but not so. Another complication for you to digest; I have never been able to get full (6800) revs from the 582, either on the ground or when flying around. Most I've got is 6200RPM, so again I thought this would be due to a coarse pitch setting. Now I have to rethink. The EGT readings are identical at about 1100 on the gauge when at 6000RPM, so I reckon the carbies are right. I checked the barrel slides in the carbies and they are opening right up at full throttle.
So I have 2 issues - an overheating engine, and an engine that is not achieving full revs.
Where do I go from here learned forumites?
Pud
I have a brand new Rotax 582 on my T500 Thruster, the engine has just turned over 25 hours on the clock. It is driving a 68" 3 blade Brolga prop with 12 degree pitch blocks through a "B" reduction box at 2.58. Now this engine has always tended to overheat from run-in on. I have a hard time keeping the temps below 80 degrees indicated on a brand new VDO gauge connected to a brand new sensor in the engine head, all connected together with the wiring that came with the unit. So, unless the new gauge is faulty, I think the temp gauge is reading correct. I will, however, double check this next time I'm at the airfield by sitting the sensor in a pot of water and heat it up. I'll cross reference the temp gauge reading with a thermometer. I have only just pulled the prop[ apart to check the pitch, and I must say I was surprised to see such a fine pitch. I was expecting something near the high side of the range, around 16 degrees. I thought the overheating would be caused by too coarse a pitch setting and I could reduce the over temp reading by reducing the pitch - but not so. Another complication for you to digest; I have never been able to get full (6800) revs from the 582, either on the ground or when flying around. Most I've got is 6200RPM, so again I thought this would be due to a coarse pitch setting. Now I have to rethink. The EGT readings are identical at about 1100 on the gauge when at 6000RPM, so I reckon the carbies are right. I checked the barrel slides in the carbies and they are opening right up at full throttle.
So I have 2 issues - an overheating engine, and an engine that is not achieving full revs.
Where do I go from here learned forumites?
Pud
