lcottrell
Joined: 29 May 2006
Posts: 1494
Location: Jordan Valley, Or
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 Posted: Wed Aug 24, 2016 4:58 am Post subject: 447 gas mileage |
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For what ever reason, I did not see the message concerning the HACman system until this morning. I normally get each message in real time and the digest overnight. The messages concerning mileage did not show up until this morning in the digest.
When I was flying my 447, I got about 20 Miles per gallon. If you are not, then I would have to guess that your jetting of the engine is incorrect. I have forgotten enough about that process that I hesitate to try to advise you in other than general terms. I assume that you are new to 2 stroke engines? If that is not so- disregard the following. There is nothing wrong with 2 strokes, if they are tuned properly.
The factory recommendations did not work for me, and it took a bit of fiddling to get the engine jetted correctly. I am at 4000 feet altitude so what worked for me may not work for you. The EGT's are your best indicator. I seemed to do the best when my EGT's were about 1150 flying at normal cruise. My problem came about when I cut the power. It wanted to red line. The size of the main jets (if I remember correctly) control the egt temps and the position of the clips is your fine tuning. If you are too rich, and your egt's are too low, then it is most likely that you are building up carbon within your engine.
The Hacman system works best with the four stroke engine. On a 2 stroke the limit for egt's is about 1230. For my HKS it is about 1400, and it is only effective at the higher altitudes. As you know the higher you go the thinner the air and the richer the fuel. Flying at 200 feet the Hacman has little effect, and for me is best left off. At 1000 or more feet agl the system will fine tune the fuel consumption by increasing the air going to the carbs. Most likely not for your system.
Your engine should be using about 2.5 gph.
Larry
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