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JetPilot
Joined: 10 Jan 2006
Posts: 1246
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 Posted: Wed May 06, 2009 10:32 am Post subject: Re: Jabiru Powered MKIII |
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600 Bucks  That is less than 1/10 th what the same parts would cost for the Rotax 912-S. I ask because my friend bought a Great Planes VW for his Kitfox, it seems like a really nice engine at a very good price. My friend will be using direct drive which should solve a lot of problems. The Redrive still seems like a a constant problematic area for many of the engine conversions, how is your latest redrive working out for you ? Is it still a belt drive.
I don't like the slide carb either, they seem to be very sensitive to fuel pressure, I read a report of a guy getting vapor lock with one several times. It just seems like a bad idea to be running such low fuel pressure that the slide carb requires. Are you up and flying again this season ?
Mike
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"NO FEAR" - If you have no fear you did not go as fast as you could have !!!
Kolb MK-III Xtra, 912-S |
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lucien
Joined: 03 Jun 2007
Posts: 721
Location: santa fe, NM
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| Posted: Wed May 06, 2009 10:41 am Post subject: Re: Jabiru Powered MKIII |
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| JetPilot wrote: | 600 Bucks That is less than 1/10 th what the same parts would cost for the Rotax 912-S. I ask because my friend bought a Great Planes VW for his Kitfox, it seems like a really nice engine at a very good price. My friend will be using direct drive which should solve a lot of problems. The Redrive still seems like a a constant problematic area for many of the engine conversions, how is your latest redrive working out for you ? Is it still a belt drive.
I don't like the slide carb either, they seem to be very sensitive to fuel pressure, I read a report of a guy getting vapor lock with one several times. It just seems like a bad idea to be running such low fuel pressure that the slide carb requires. Are you up and flying again this season ?
Mike |
FWIW, A friend of mine who used to run a VW conversion said the usual TBO for the VW is about 500 hours, at least for the top end. Is that about right?
If so, the 912 parts aren't actually that much more expensive since they'll last (now unofficially) 2000 hours at least. I.e. you won't be buying them as often long as the engine stays together.
VW is still intriguing tho, especially if it has a good redrive....
PS: another piece of trivia on the VW engine if this isn't just an urban legend. Apparently it was used in the Volkswagen as a means to hide its numbers - the story goes that it was originally developed for aircraft use and the Nazis had to do something with them until they had a plane to use it in. That may be why its already a not so bad conversion as an a/c motor....
That may just be a tall tale tho....
LS
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LS
Titan II SS |
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NeilsenRM(at)comcast.net
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| Posted: Wed May 06, 2009 11:35 am Post subject: Jabiru Powered MKIII |
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Mike/Lucien
Redrives do add some issues but give some benefits that more than out way
any negatives. The VW redrive takes the gyroscopic and harmonic load off the
crank shaft. VW engines almost died out as aircraft conversions due to crank
shaft breakage. Better cranks and a extra large main bearing on the pulley
end solved that issue. Way too much heat in the heads shortens the life of
VW valves. My redrive engine runs so much cooler than my direct drive engine
so I'm hoping it will have a longer valve life. I have also seen titanium
racing valves that might be a solution. Great Plains is also working on
water cooled heads and that will solve the top end TBO issues. The biggest
reason for a redrive is the increased thrust. My direct drive engine could
barely get me off the ground and ran high oil and CHT temperatures and still
would only fly 65 MPH at cruise. My redrive engine gets me and a passenger
off the ground in fine fashion, runs almost 50 degrees cooler CHT 20 degrees
cooler oil temps, a gallon and hour less fuel burn and my cruise is 75MPH.
Say what you want but I'm convinced a redrive on a VW is a good thing.
I'm starting my third season on the original redrive belts and am
considering replacing them this year.
Rick Neilsen
Redrive VW powered MKIIIC
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