Comments on: Gunbus 410 Cubic Inch V-Twin Motorcycle Completed http://thekneeslider.com/archives/2008/07/09/gunbus-410-cubic-inch-v-twin-motorcycle-completed/ Motorcycle News for Positive People Sat, 21 Nov 2009 11:49:36 -0500 http://wordpress.org/?v=2.8.5 hourly 1 By: Thalwan http://thekneeslider.com/archives/2008/07/09/gunbus-410-cubic-inch-v-twin-motorcycle-completed/comment-page-3/#comment-266361 Thalwan Tue, 03 Nov 2009 19:40:01 +0000 http://thekneeslider.com/?p=1893#comment-266361 how to brake this show? the bike is very crazy insane! I want to see the road ... how to brake this show? the bike is very crazy insane! I want to see the road …

]]> By: Jim Flower http://thekneeslider.com/archives/2008/07/09/gunbus-410-cubic-inch-v-twin-motorcycle-completed/comment-page-3/#comment-265809 Jim Flower Tue, 20 Oct 2009 01:59:04 +0000 http://thekneeslider.com/?p=1893#comment-265809 Oops, Correction to above post: the bore size is 156mm, (6.142") Not found in American radial engines that I am aware of. The fins closely resemble the Pratt & Whitney R2800 front cylinder head, an Alcoa forging with cut fins. However, the bore size is 5.750", with a 6" stroke. He's got a cool engine. I would put it in a better chassis though (With a starter!). Jim Flower jimflowerllc.com Oops,
Correction to above post: the bore size is 156mm, (6.142″) Not found in American radial engines that I am aware of. The fins closely resemble the Pratt & Whitney R2800 front cylinder head, an Alcoa forging with cut fins. However, the bore size is 5.750″, with a 6″ stroke.
He’s got a cool engine. I would put it in a better chassis though
(With a starter!).
Jim Flower
jimflowerllc.com

]]> By: Jim Flower http://thekneeslider.com/archives/2008/07/09/gunbus-410-cubic-inch-v-twin-motorcycle-completed/comment-page-3/#comment-265808 Jim Flower Tue, 20 Oct 2009 00:24:41 +0000 http://thekneeslider.com/?p=1893#comment-265808 Jay Moore, As I work with radial aircraft engines, I too studied the pics. They are not Curtis Wright, (cast heads) or Pratt & Whitney. (forged heads w/ cut fins) They are probably German. The bore size 176 mm (6.929") is not found in American radials. I applaud Herr Leonhardt for his vision and craftsmanship, although I have some critiques; aside from what has already been written. 1) I do not see a starter and battery. This is major. Consider the forces involved on that aspect alone. If you can't start it, you can't ride it. It must be self contained. 2) His website promises electronic fuel injection, yet I see no sensors, anywhere. Fuel injection is complex, the plumbing is bulky (especially for this volume demand), and has a lot of components that are difficult to hide. This is something I am currently dealing with for a client's 142" injected bike. 3) The general layout. The bike does not have to be so big just because the engine is. Motorcycle chassis design these days include many proven concepts that are ignored here. For example, girder front ends were discontinued ages ago for good reason. All that being said, I would love to meet this man. I'm working on a 312 project myself. Jim Flower jim@jimflowerllc.com Jay Moore,
As I work with radial aircraft engines, I too studied the pics. They are not Curtis Wright, (cast heads) or Pratt & Whitney. (forged heads w/ cut fins) They are probably German. The bore size 176 mm (6.929″) is not found in American radials.
I applaud Herr Leonhardt for his vision and craftsmanship, although I have some critiques; aside from what has already been written.
1) I do not see a starter and battery. This is major. Consider the forces involved on that aspect alone. If you can’t start it, you can’t ride it. It must be self contained.
2) His website promises electronic fuel injection, yet I see no sensors, anywhere. Fuel injection is complex, the plumbing is bulky (especially for this volume demand), and has a lot of components that are difficult to hide. This is something I am currently dealing with for a client’s 142″ injected bike.
3) The general layout. The bike does not have to be so big just because the engine is. Motorcycle chassis design these days include many proven concepts that are ignored here. For example, girder front ends were discontinued ages ago for good reason.

All that being said, I would love to meet this man. I’m working on a 312 project myself.
Jim Flower
jim@jimflowerllc.com

]]> By: Napewaste http://thekneeslider.com/archives/2008/07/09/gunbus-410-cubic-inch-v-twin-motorcycle-completed/comment-page-3/#comment-261100 Napewaste Tue, 15 Sep 2009 05:55:45 +0000 http://thekneeslider.com/?p=1893#comment-261100 Very nice. I have a mockup of something similar and is more efficient. Jay would like mine, too. It's also an older design than this, so I thought about scaling up right at the first. Great minds think alike, and all that. Very nice. I have a mockup of something similar and is more efficient. Jay would like mine, too. It’s also an older design than this, so I thought about scaling up right at the first. Great minds think alike, and all that.

]]> By: jay http://thekneeslider.com/archives/2008/07/09/gunbus-410-cubic-inch-v-twin-motorcycle-completed/comment-page-3/#comment-257498 jay Thu, 13 Aug 2009 18:58:18 +0000 http://thekneeslider.com/?p=1893#comment-257498 Can I get one with stabilizers as I only have a 29 inch leg :) Can I get one with stabilizers as I only have a 29 inch leg :)

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