150 miles on a new motor and this

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comnoz said:
That's only 22 mps. :rolleyes:

I think the record for piston speed was a 92 Honda v12 at 38 mps. It used buttons to retain the pins.
And it only lasted one race.
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worntorn said:
Curious to see what piston speed some modern machinery runs at ( bikes that last, not race bikes)
The 955i Daytona has a 65 mm stroke and is rev limited at 12,000 .
The piston speed calculator says this is 26mps.
So we are maybe no so bad with the old Norton at running at 6500 rpm and 19.3mps.

Some difference in crank rigidity and machining tolerances may be present in this comparison:)

Glen
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wow...
based on this calculator: https://www.vcalc.com/equation/?uuid=d9b897f0-b3b0-11e4-a9fb-bc764e2038f2 (does not seem to be accurate)
my GSXR 600 does about 35.6 m/s at 16,000 rpm (redline) (Bore x Stroke: 67mm x 42.5mm)

edit: I'm thinking that math can't be right, because using the numbers quoted for the 955 (65mm stroke, 12k rpm) I'm showing like 40 m/s with that calculator

using this calc: http://www.csgnetwork.com/pistonspeedcalc.html
I'm seeing 22.67 m/s for the GSX-R (which seems much more sane) and the same numbers quoted for the 955.

same calc is showing my Triumph 1050 (bore/stroke 79mm/71.4mm, 10.5k redline) at 24.99 m/s
 
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jae said:
wow...
based on this calculator: https://www.vcalc.com/equation/?uuid=d9b897f0-b3b0-11e4-a9fb-bc764e2038f2 (does not seem to be accurate)
my GSXR 600 does about 35.6 m/s at 16,000 rpm (redline) (Bore x Stroke: 67mm x 42.5mm)

edit: I'm thinking that math can't be right, because using the numbers quoted for the 955 (65mm stroke, 12k rpm) I'm showing like 40 m/s with that calculator

using this calc: http://www.csgnetwork.com/pistonspeedcalc.html
I'm seeing 22.67 m/s for the GSX-R (which seems much more sane) and the same numbers quoted for the 955.

same calc is showing my Triumph 1050 (bore/stroke 79mm/71.4mm, 10.5k redline) at 24.99 m/s
Click to expand...

The first calculator gives you the maximum piston speed. [around mid stroke]
The second calculator gives the average piston speed.
 
I am in the process of getting another set of pistons. A gouge in the cylinder is too deep for a .020" rebore. Can someone explain why the Norton heads need to be re-torqued so many times initially? Hopefully I will get it back together in the next couple of weeks.
 
I noticed a long time ago the JCC circlips were shit, had a set start to hammer out the grooves, the material was crap but I also suspect that they were 17mm not 11/16, honed the burrs off fitted a set of 11/16 clips from bearing shop and they stayed tight in groove
Circlips and orings, alot of people and manufactures dont pay enough attention to the 50cent piece in the shitty little groove
 
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