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herbgh(at)nctc.com
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 Posted: Thu Feb 18, 2010 7:23 am Post subject: Valley Engineering Big-Twin - Any one flying with one? |
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Dick Starks wife,Dawn Patrol web site, is flying in front of
one...Why not try there...? Maybe the only one on a Kolb/ Herb
At 12:02 AM 2/18/2010, you wrote:
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Hi folks,
I posted this some time back, didn't get much response. Some time
has passed and other folks may now had one and other that do have
had some time to form an opinion regarding the engine.
So for those that have or are now flying with this engine, how about
a little report on how you feel about the engine, it's power output,
comparison to typical Rotax's like the 447 or 503, and reliability.
Thanks,
jerb
Checked by AVG - www.avg.com
02/17/10 07:35:00
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mdnanwelch7(at)hotmail.co
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| Posted: Thu Feb 18, 2010 8:22 am Post subject: Valley Engineering Big-Twin - Any one flying with one? |
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Rick N,
Oops, I misspoke about the "Big Twin". It isn't the half-VW I said it was. It is the Generac V-twin. (I said my knowledge was vast, I didn't say it was accurate!!)
Yes, I know they were planning on putting a turbo on the Generac, I saw it. When I drove down to meet the folks at Valley Engineering last summer, they gave me the "dime tour". The whole operation is a family affair, and all of them working there are related.
(nice people, BTW)
The Generac motor with the turbo is a very basic installation. Basically, they just bolted a small turbo on the motor, period! I don't believe they are going to deal with the fuel/air ratio change, or any other turbo-installation issues. Larry ((at) Valley Enr'g) and I talked about this.
I'm not too sure how successful the basic turbo installation will be. I think that's why it hasn't gone too far.
IMO, if you require a turbo on a Generac just to make it worthwhile to power a plane, you're much better with off with a 503!! For the Generac to be a successful airplane engine, there needs to be a hellava lot more engineering and development on it.
Mike Welch
From: NeilsenRM(at)comcast.net
To: kolb-list(at)matronics.com
Subject: Re: Re: Valley Engineering Big-Twin - Any one flying with one?
Date: Thu, 18 Feb 2010 10:41:43 -0500
.ExternalClass .ecxhmmessage P {padding-bottom:0px;padding-left:0px;padding-right:0px;padding-top:0px;} .ExternalClass BODY.ecxhmmessage {font-family:Verdana;font-size:10pt;} Mike/All
The valley Big Twin is the Generac. I talked in depth with Larry Smith at Valley last summer at Oshkosh about Jimmy's big twin installation. Larry indicated that his performance was compromised a bit by prop selection. They are working on a turbo version that should give 503 level performance.
Jimmy indicated that Valley bolted the engine directly to the engine mount without vibration dampers. I told Larry and Jimmy that I didn't think that was a good idea. I was told by someone else that Valley gets the weight down on the genrac by cutting most of the fly wheel off. I have not confirmed it.
Rick Neilsen
Redrive VW powered MKIIIC
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