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Yet another engine option

 
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aslsa.rng(at)gmail.com
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PostPosted: Tue Jul 28, 2009 2:20 am    Post subject: Yet another engine option Reply with quote

A while back I offered a new Rotax B gearbox with a 2.00 to 1 ratio up for sale and had no takers here on the list, but it did sell quickly to a fellow in Thailand through eBay. Yesterday Prayote sent me a few pictures of the installation. Thought it might be of interest. The engine is a Subaru EA71.

Rick Girard


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JetPilot



Joined: 10 Jan 2006
Posts: 1246

PostPosted: Tue Jul 28, 2009 4:45 am    Post subject: Re: Yet another engine option Reply with quote

Very interesting !!!

I did not know a B box would take that kind of horsepower, I wonder if it will last ?? I think I would have used a C box on an engine that big. Adapting a Rotax gear box to an existing engine sounds like a great idea though. I would like to see an inexpensive and reliable alternative to the 912-S developed... But I'm not holding my breath, people have been trying to do that for many years now with very little success.

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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herbgh(at)nctc.com
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PostPosted: Tue Jul 28, 2009 5:54 am    Post subject: Yet another engine option Reply with quote

The EA71 engine is pretty ancient...60 hp at the best... Its
successor was the EA81...then the EA82... Herb
At 07:45 AM 7/28/2009, you wrote:
Quote:


Very interesting !!!

I did not know a B box would take that kind of horsepower, I wonder
if it will last ?? I think I would have used a C box on an engine
that big. Adapting a Rotax gear box to an existing engine sounds
like a great idea though. I would like to see an inexpensive and
reliable alternative to the 912-S developed... But I'm not holding
my breath, people have been trying to do that for many years now
with very little success.

Mike

--------
"NO FEAR" - If you have no fear you did not go as fast as
you could have !!!

Kolb MK-III Xtra, 912-S


Read this topic online here:

http://forums.matronics.com/viewtopic.php?p 54985#254985


Checked by AVG - www.avg.com
07/27/09 05:58:00


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lucien



Joined: 03 Jun 2007
Posts: 721
Location: santa fe, NM

PostPosted: Tue Jul 28, 2009 9:21 am    Post subject: Re: Yet another engine option Reply with quote

JetPilot wrote:
Very interesting !!!

I did not know a B box would take that kind of horsepower, I wonder if it will last ?? I think I would have used a C box on an engine that big. Adapting a Rotax gear box to an existing engine sounds like a great idea though. I would like to see an inexpensive and reliable alternative to the 912-S developed... But I'm not holding my breath, people have been trying to do that for many years now with very little success.

Mike


The real issue with the B box is supporting whatever shaft the small drive gear is fitted to - unlike the C box, there's no separate bearing for the drive shaft to take the side loads. On the rotax motor the PTO crank bearings perform this job, partly why the provision 8 motors are so hugely beefy at the PTO end.....

I'd imagine the builder came up with a seperate bearing for this?

Also, any info on the weight? Looks like it weights a ton just looking at the photo, but then looks can be deceiving...

Looks like it flies tho!

LS


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LS
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JetPilot



Joined: 10 Jan 2006
Posts: 1246

PostPosted: Tue Jul 28, 2009 1:44 pm    Post subject: Re: Yet another engine option Reply with quote

I have always liked the looks of the BMW engine conversion. I have seen this on a Trike. my friend flys it, and it is smooth, powerful, with fuel injection and seems to work very well and trouble free.

http://www.ultralightnews.com/engineinfo/bmwconversion.htm

http://www.ultralightnews.com/engineinfo/bmwconversion.htm

Mike


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slyck(at)frontiernet.net
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PostPosted: Tue Jul 28, 2009 2:24 pm    Post subject: Yet another engine option Reply with quote

Mike, what is the displacement of that engine?
BB

On 28, Jul 2009, at 5:44 PM, JetPilot wrote:

Quote:


I have always liked the looks of the BMW engine conversion. I
have seen this on a Trike. my friend flys it, and it is smooth,
powerful, with fuel injection and seems to work very well and
trouble free.

http://www.ultralightnews.com/engineinfo/bmwconversion.htm

http://www.ultralightnews.com/engineinfo/bmwconversion.htm

Mike

--------
"NO FEAR" - If you have no fear you did not go as fast
as you could have !!!

Kolb MK-III Xtra, 912-S


Read this topic online here:

http://forums.matronics.com/viewtopic.php?p 55031#255031


Attachments:

http://forums.matronics.com//files/bmwconversion_300.jpg



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herbgh(at)nctc.com
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PostPosted: Tue Jul 28, 2009 2:49 pm    Post subject: Yet another engine option Reply with quote

Another Mike...has a BMW engine on his MkIII... He made an adapter
plate and used a c or e box as I recall.. Last I looked, it is for
sale on Barnstormers...Herb
At 04:44 PM 7/28/2009, you wrote:
Quote:


I have always liked the looks of the BMW engine conversion. I have
seen this on a Trike. my friend flys it, and it is smooth, powerful,
with fuel injection and seems to work very well and trouble free.

http://www.ultralightnews.com/engineinfo/bmwconversion.htm

http://www.ultralightnews.com/engineinfo/bmwconversion.htm

Mike

--------
"NO FEAR" - If you have no fear you did not go as fast as
you could have !!!

Kolb MK-III Xtra, 912-S


Read this topic online here:

http://forums.matronics.com/viewtopic.php?p 55031#255031


Attachments:

http://forums.matronics.com//files/bmwconversion_300.jpg

Checked by AVG - www.avg.com
07/28/09 06:00:00


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elleryweld(at)AOL.COM
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PostPosted: Tue Jul 28, 2009 7:22 pm    Post subject: Yet another engine option Reply with quote

I have a EA-81 in my shop but I figure it would be to heavy for any Kolb at 240lbs But I think its the best alternative (just My opinion) if you can use an engine that weight

Ellery in Maine Back in the Saddle again

I did not know a B box would take that kind of horsepower, I wonder if it will
last ?? I think I would have used a C box on an engine that big. Adapting a
Rotax gear box to an existing engine sounds like a great idea though. I would
like to see an inexpensive and reliable alternative to the 912-S developed...
But I'm not holding my breath, people have been trying to do that for many years
now with very little success.

Mike

--------
"NO FEAR" - If you have no fear you did not go as fast as you could
have !!!

Kolb MK-III Xtra, 912-S




Read this topic online here:

[url=http://forums.matronics.com/viewtopic.php?p 54985#254985]http://forums.matronics.com/viewtopic.php?p 54985#254985[/url]










[quote][b]


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