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815TL
Joined: 10 Oct 2008
Posts: 62
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 Posted: Tue Dec 16, 2008 4:38 am Post subject: 582 CHT temps? |
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Hey guys,
Finally got ahold of my instructor, and we are going to start flying after the first of the year. He came up last night and looked over the plane, talked a while and we started it up.
We let the engine warm up for a couple of minutes till the water temp was about 130* or so, then ran it up to 5500RPM and let it run for a couple of minutes, and leaned it out a little as we talked about a few things. I brought it back down to about 2500 RPM and looked over all the gauages.
The EGT was fine, both were around 1050-1100, the one seems to be about 50* cooler than the other. The one CHT however was a little high. Now the green and red markings are just stickers that were put on the glass of the gague, so it is not pefect depending on your vewing angle, but it looked to be in the red zone. I don't remember the reading exaclty, but I think it was close to 300*, but not much over. The other CHT, seemed to be about 30-50* lower.
So, I have read one article that states that the CHT on a 2 stroke is basically useless, the real gague to watch is the EGT. Is this the case, or is there cause to be concenrned with a slightly high CHT? Any reaosn why one would be up into the red, and the other OK? I know the front gets more air, but 30-50* seems a bit much.
Andrew
Kitfox II, 815TL, Rotax 582-C
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LarryM
Joined: 27 Nov 2007
Posts: 63
Location: Genoa, IL
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| Posted: Tue Dec 16, 2008 2:57 pm Post subject: Re: 582 CHT temps? |
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I would not worry about the CHT on a water cooled engine. The water temp prob is located right at the top of the cylinder head. That and EGT are the parameters to watch. EGT is the most immediate and caused instant damage, while the water temp is slower to react and is more of an "overall" reading. Do not be surprised to see water temps near 200F, depending what the OAT is and what your power is set at, but cruise should be less than 175F.
The difference in CHT readings could be as simple and most likely the washer/probe. Cover up or take out the CHT gauge, but respect the water temps.
larry
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