mdnanwelch7(at)hotmail.co Guest
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Posted: Thu Feb 18, 2010 11:04 am Post subject: Valley Engineering Big-Twin - Any one flying with one? |
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Herb,
I think the biggest application of the Generac is as a generator. But, that aside, you're probably correct regarding their use in aircraft.
You know what would be nice???? A spreadsheet that list ALL engines in a certain power range....say 40-55 HP. Rotaxes, Generacs, half VW, Victor, Cuyuna, Victor, etc., etc. etc. All of 'em!!
Then, try to list their atributes, like TBO, cost per hour, maintenence interval, GPH, rebuild costs, number of hours of proven use, etc.
This would be a big list, but it would make for interesting reading. You could also cover different engines in the 60-80 HP range, and finally, the 80-100 HP range.
Mike Welch
Date: Thu, 18 Feb 2010 12:30:12 -0600
To: kolb-list(at)matronics.com
From: herbgh(at)nctc.com
Subject: RE: Re: Valley Engineering Big-Twin - Any one flying with one?
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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