herbgh(at)nctc.com
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 Posted: Tue Feb 19, 2013 7:25 am Post subject: Cooling and warming our Rotax engines:-) |
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I was always amazed that the 277 used almost fuel as my 447... On a
Kitten, then 277 had to run very hard most of the time..while my 447
could cruise the Firefly very nicely between 5200 and 5600...
I was thinking about the twins...I have seen the 277 on a kitten and it
definitely had quite a bit of vibration... Maybe some sort of sliding
device with an automatic spring loaded return to full open.. Mainly on
the radiator since I now have a 582... with single radiator.. Could be
that something on the order of a window shade would work..With
different material of course.. Herb
On 02/18/2013 11:13 PM, wakataka wrote:
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After two cold seizures, I tried to build something like that for my free air 277, but the vibration from that little beast kept tearing apart whatever design I came up with. I finally solved the problem by having the cylinder honed out about 0.003 larger than factory spec and running a main jet 2 steps richer than spec. I'm also very careful not to go to full throttle immediately after a long descent at idle. On a touch and go, I'll usually take off with about 3/4 throttle and wait until the CHT gets up to 250 before going to full throttle.
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There is something fascinating about science. One gets such wholesale returns of conjecture out of such a trifling investment of fact.
Mark Twain
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