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Michel Dierick
Joined: 25 Sep 2007
Posts: 4
Location: Belgium
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 Posted: Mon Nov 26, 2007 2:12 pm Post subject: Rotax 582 & Oil% |
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Hi,
I tried to make a beautiful flight last Saturday but it turned out completely different.
1. It was quit cold. The mechanic on my airfield advised me to put tape over the radiator in order to prevent too much cooling. (Radiator was covered for 70%...).
2. Oil-mixture in the fuel. He proposed 1,8% instead of 2%. What I did.
After all, he is the expert (was in a previous young life also mechanic on two-stroke competition motorbikes) and I'm completely new and unexperienced in two-stroke engines. (In my country, we say I'm green behind my ears)
The flight became a complete horror.
On take-off, the engine didn't reach 6500rpm full power, just 6000rpm
It wasn't running like a Swiss watch but made a lot of vibrations.
My Kitfox climbed slowly and after reaching 2000ft altitude, I began to smell molten plastic AND the engine started to cough 3-4 times !
I quickly scanned my instruments and saw the water temp was rising to 115°C... Damned !!
I immediately reduced power, went into a gently dive and made a emergency landing on my airfield. During descent, I saw the water temp
becoming normal (85°C).
It was obvious that the temp was a direct result of too much tape over the radiator. But was caused the engine to cough ? Was it the high temperature ? Is it the oil mixture ?
Somebody can help me ?
Greetz,
Michel
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Tom Jones
Joined: 12 Mar 2006
Posts: 752
Location: Ellensburg, WA
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| Posted: Mon Nov 26, 2007 6:34 pm Post subject: Re: Rotax 582 & Oil% |
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| Michel Dierick wrote: | Hi,
It was obvious that the temp was a direct result of too much tape over the radiator. But was caused the engine to cough ? Was it the high temperature ? Is it the oil mixture ?
Somebody can help me ?
Greetz,
Michel |
Michel, I don't think the 1.8% oil mixture would cause what you describe. I am not familiar with the water cooled rotax two strokes, just the air cooled ones, so I don't know what effect the high water temperature has. Cold air results in the engine running more lean than in warm air. Pull your sparkplugs out and post here what they look like and I am sure you will get some help from the 582 flyers.
For what it is worth, the temperature here has been in the low to mid 20 degrees F for a few days. When I checked my Kitfox today there was ice in the panel tank vent line.
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Tom Jones
Classic IV
503 Rotax, 72 inch Two blade Warp
Ellensburg, WA |
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dave
Joined: 22 Sep 2006
Posts: 1382
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| Posted: Tue Nov 27, 2007 5:15 am Post subject: Re: Rotax 582 & Oil% |
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| Quote: | I immediately reduced power, went into a gently dive and made a emergency landing on my airfield. During descent, I saw the water temp
becoming normal (85°C).
It was obvious that the temp was a direct result of too much tape over the radiator. But was caused the engine to cough ? Was it the high temperature ? Is it the oil mixture ?
Somebody can help me ?
Greetz,
Michel
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Normal temps are not 85C - that Is getting into the "caution area" of a 582 ( 80C to 90C - 176 to 200F ) You can run at 180 without issues but it leave little room for error. You were running at 240 F (115C ) WAY TOO HOT........ 70% of RAD covered? I would rather see 70% of Rad open on a stock Kitfox Rad...... ( 4" b y 20" = 80 sq inches)
Why you smell molten plastic ? Did you find anything melted ? Likely not but that Engine was telling to it was VERY HOT.
You never said was your outside air temp was ?
You never said what kind of oil you used ?
Mixture on Pre mix should be 50 to 1 = 2%
Oil injected engines will run leaner than that over all - BUT they supply oil with demand .. eg full throttle = about 50 to 1 mix but at reduced throttle you might run 70 to 1........ If you try to skimp on oil ratio then it is possible you will not have enough oil under full throttle and high load conditions.
I would run some static ground run ups prior to next flight of duration of 2 to 5 minutes at full throttle to make sure you have similar to full load climbout engine checks. Depending on Prop your static can range from 6000 to 6500. Where were your EGT gauges through alll of this ?
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