herbgh(at)nctc.com
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 Posted: Thu Feb 18, 2010 10:33 am Post subject: Valley Engineering Big-Twin - Any one flying with one? |
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Mike, all
The biggest application for the V twins is currently on Trikes... It appears to be a good engine for certain applications...Herb
At 10:15 AM 2/18/2010, you wrote:
[quote]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
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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