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EVguru
09-17-2010, 07:42 AM
Building a V4 from scratch;

http://3.bp.blogspot.com/_lROQAsWcW3o/TJK8PX7ZNFI/AAAAAAAAATg/kLhiIsnCb14/s320/P1000200.JPG

http://moto2-usa.blogspot.com/2010_03_21_archive.html

lazlo
09-17-2010, 08:40 AM
Interesting build. For the prototype, they're taking a Kawasaki Ninja head, slicing it on a bandsaw, and TIG'ing the water channels closed:

"For our first engine iteration we will be using sectioned ZX-6R cylinder heads to enable us to develop a stable and low loss bottom end without chasing induction, combustion and exhaust issues.

Scott Kolb of Kolb Machine, was willing to do a quick test head and see how the passages would seal up and the resulting heat input affected valve seat retention and deck flatness. A cheapie eBay head served as the test mule and taking it to the bandsaw resulted in the following part to be welded:"


http://4.bp.blogspot.com/_lROQAsWcW3o/S66jbC3nw0I/AAAAAAAAABg/zn2y3H0gUXg/s320/IMG_0396.JPG

http://2.bp.blogspot.com/_lROQAsWcW3o/S66kaH_tx9I/AAAAAAAAAB4/UbTD6wdXJBU/s320/IMG_0397.JPG

topct
09-17-2010, 09:21 AM
Looks almost like a Honda CX engine with two more cylinders. The engine being above the transmission sure makes it tall.

Looking at the rendering I want to say, Oh, another one of those. Why?

Willy
09-17-2010, 11:54 AM
Looks almost like a Honda CX engine with two more cylinders. The engine being above the transmission sure makes it tall.

Looking at the rendering I want to say, Oh, another one of those. Why?


Precisely my first thoughts as well.
Looking a little deeper gave me some insight into their design philosophy.



The overall engine assembly is very short front to rear to enable a long swingarm in a short wheelbase. The resultant slight additional height compared to a normal I4 is easily accommodated by the unique chassis needed for the Hossack-style front suspension.


Lots of machining content on this page:
http://moto2-usa.blogspot.com/

topct
09-17-2010, 03:41 PM
This is interesting,

http://moto2-usa.blogspot.com/2010/03/project-overview.html

But then why oh why did it make old Harley cry.

http://www.blaisracing.com/assets/images/guessbike4.jpg

Peter.
09-17-2010, 04:11 PM
I don't see how making it a V-4 shortens the engine, since they are reducing width across the bike not front to rear. It still has to have a gearbox!

One thing a V-4 definately does is increase the part count, internal frictional losses and raise the center of gravity of the engine - none of which are desirable.