Matt@TYGA wrote:Here's a chance for all you budding tuners to learn about the NSR motor and make some comparisons against race components.
Measure the standard NSR deck height, squish clearance, combustion chamber volume and piston crown height, then try the same with the RS piston. This will show you the differences so you will have an idea of what to do.
I could tell you the figures but that takes the fun out of it doesn't it?
I got enough fun lined up already with my RS! I don't know many people who have deck height gauges (Ye, I got one for the RS). I am still trying to figure out the proper way to measure the crown height... The tuner wrote numbers down on the new piston like +0.00213 on it. I was told by the previous owner I could never reproduce the measurement, so just measure the height on my own, and get the deck height as close to 2.0 as possible (1.98 on the lower, and as close to 2.0 on the upper as possible). I useally get an idea of the taller piston by measuring from the wrist pin hole to the top of the corwn, and use the taller on on the top. I then use the base gasket collection I have to get the proper deck height for each cylinder.
So how is the proper method for measuring the crown height, etc...
Matt@TYGA wrote:
An RS piston is lighter, so better response when you turn up the volume.
Hmm, never thought of it, but yes you are right... the RS piston is WAY lighter.
Matt@TYGA wrote:
The single ring offers less friction so saps less power, but doesn't seal as well at low rpm as a twin ring design.
ye, thats what I meant
Matt@TYGA wrote:
The side cutouts have do effect on port opening or closing.
I am guessing since the NSR port timing is SO close to the RS, using the RS pistons in the NSR with the cutouts will help.
Matt@TYGA wrote:
If anyone's worried about reliability or regular top end rebuilds then stick to the standard parts.
If it were me, and I had a street NSR, I would stick with stock NSR parts. Now for the race NSR's, you got me thinking
I am already buying top end kits by the crate load (useally six at a time), so adding a couple more here and there for the NSR wouldn't be a big deal.
Thanks for the Info Matt
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Charles Gallant