posted October 24, 2003 10:07 AM
Y2kzx12r has been trying to get Doug to give information about this and cams with no "posted" responses.....
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All must bow to the "Ra Supremecy"...
Perhaps there's a master mechanic (MVR) out there who would be willing to document the mod on our 12s? Probably just wishful thinking....
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Posts: 3212
posted October 24, 2003 03:35 PM
I believe what they are talking about is how the 10R has some kind of vents or holes at the bottom portion of the cylinder walls. It's supposed to help release the pressure on the down stroke to help push the piston on the upstroke. Similar to the GSXR... I guess.
Is this something that cold be done to they cylinder walls of a 12R or a big bore kit? Would it be worth it? How big and/or many holes would be needed to be effective? Where should the be located?
Not that I personally am interested, since I'm trading my ole 12R for the 10R anyway.
What I REALLY want to know is when will Muzzy have a steering damper available for the 10R (potential thread hijacking question)?
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There are only three sports: bullfighting, motor racing, and mountaineering; all the rest are merely games.
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posted October 24, 2003 04:46 PM
I would imagine that the benefit is limited by how fast the pistons are moving up and down (lower rpm / shorter stroke = lower speed) and the initial design of the cylinder in the first place. On a longer stroke motor, such as a gsxr1000, I would imagine it would be of greater benefit, as compared to the 12. Course, I may be completely off base. ____________
82 Gpz750, 84 Ninja 900, 2000 ZX12R (Muzzy Big Bore Kit), *another* 2000 ZX12R (Muzzy custom stroke crank 1341cc motor), 2004 ZZR1200, 2005 ZX10R, 2007 ZX14, 2008 Concours 14, 2014 Versys 650, 2014 Yamaha WR450F, 2015 Ninja H2
posted October 24, 2003 07:52 PM
Edited By: dougmeyer on 24 Oct 2003 20:52
Every time you move one piston down in the bore the air that is below it must go somewhere. Conveniently, there is a place for it- into the area created by the piston rising in the adjacent cylinder. The easier you make it for this air to get there the the less of a pump effect you get and it takes power to pump that air back and forth. If you look at the cases of a 12 you'll see that the designers left a fair amount of room for this airflow. The more compact you make the cases the less room there is. So, you notch or "window" the lower part of the cylinders and case to allow for a pathway to reduce the pumping losses. My ZX-11s had windows that looked like two stroke ports in the adjacent 1-2 and 3-4 cylinder pairs facing each other just below the lowest travel of the oil ring that allowed for good air transfer. Ooops, I think just told a secret
I haven't seen the inside of a 10 yet, so I don't know what theirs look like.
I'm going out to stare at the sky now.
Doug
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posted October 24, 2003 09:17 AM
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