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lcottrell
Joined: 29 May 2006
Posts: 1494
Location: Jordan Valley, Or
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 Posted: Thu Feb 05, 2009 2:58 pm Post subject: HKS heat problems |
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Earlier Richard G. suggested that I needed to lower my clip one notch to get more fuel into the carbs to lower my CHT's, while on the face of it the idea is sound. I resisted doing that because the engine is oil cooled, and if anything the oil temps were a bit lower that it really should have been, and did not correlate. The EGT's were lower than they should have been as well. It just didn't compute.
On my flight yesterday I left my choke on full while I flew 70 miles on one leg of the trip. ( I am a bit ashamed that it wasn't on purpose) My temps were actually cooler by about 10 degrees or a bit more. The engine ran fine, enough that I had no idea that I had left it on. For the return 70 miles I did not have the choke on, and the CHT was a bit higher, but not quite (seemed to me) as high as it has been. I do have almost 10 hours on the engine now. Today I pulled the plugs to see what they look like. They are sooty, not terribly, but indicate too much gas getting to them.
Now I want to assure you that I mean no criticism of any of the ideas that I have been given by any of you. We are all fumbling in the dark, with not enough information to know what course to take. I did want to share with those who might be interested what seems to be happening.
Another disclaimer is needed here. I am a pessimist by nature, operating on the theory that I can only be vindicated if things go wrong and best case, pleasantly pleased when they work out.
My conclusion- I need to fly more!
Larry C
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zeprep251(at)aol.com
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| Posted: Thu Feb 05, 2009 3:21 pm Post subject: HKS heat problems |
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Larry,
The EGT on my 2200 jabiru are 1390 at cruise.I don't know if the mixture will have much effect on CHTs,they are air cooled and run almost constantly at 290.On GA aircraft engines,leaning to peak often gives exhaust temps in that range.Does HKS give any guide lines for temps?
G.Aman
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lcottrell
Joined: 29 May 2006
Posts: 1494
Location: Jordan Valley, Or
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| Posted: Thu Feb 05, 2009 3:36 pm Post subject: HKS heat problems |
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Max is supposed to be 1400 at the point that I have my probes located.
Larry C
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zeprep251(at)aol.com
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| Posted: Fri Feb 06, 2009 4:27 am Post subject: HKS heat problems |
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Larry,
While I had my FS ,I frequently flew with a friend with a Hawk Arrow with an HKS.His fuel burn was consistently half of mine with the 503 DCDI.We cruised at 70-75mph and I burn about 4GPH (at)5700rpm to run with him.My EGTs would get above 1150 (at) that rpm.I think once you get it dialed in you will really like the economy.
G Aman
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