[Z06] Accuracy of Spintron Test
#1
Melting Slicks
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Accuracy of Spintron Test
The Spintron test is done with the lack of combustion so the comparison to an actual engine is not apples to apples. You have very high temps in the combustion chamber that forces the piston down. The downward force on the piston is also forcing the valves closed. There are many other factors that change due to the heat. So, I am just throwing this out for some discussion. The assumption has been the Spintron test is 100 percent accurate.
#2
Burning Brakes
The Spintron test is done with the lack of combustion so the comparison to an actual engine is not apples to apples. You have very high temps in the combustion chamber that forces the piston down. The downward force on the piston is also forcing the valves closed. There are many other factors that change due to the heat. So, I am just throwing this out for some discussion. The assumption has been the Spintron test is 100 percent accurate.
#3
The assumption is not that it is 100% accurate, but a data point with reasonable accuracy to assist the designer/builder make informed decisions. They are not used for just valve train analysis either, but will spin just about anything you want, provided you can figure out how to marry it up with the spin rig.
#4
Team Owner
BAM!!!
#5
So the 350 lb man sitting in the aluminum chair in actually usually sitting on a chair with 6 legs, but the test was done with a 4-leg chair and it is then recommended that he not sit in the 6-leg chair based on the results from testing the 4-leg chair? Right?
#7
No. You said six years ago the man was 345lbs. Where did the 5lbs come from? That chair wouldn't have broken if he was 345lbs. I also don't like that you used a chair that they don't sell OTC. Who does that?
#8
The Spintron test is done with the lack of combustion so the comparison to an actual engine is not apples to apples. You have very high temps in the combustion chamber that forces the piston down. The downward force on the piston is also forcing the valves closed. There are many other factors that change due to the heat. So, I am just throwing this out for some discussion. The assumption has been the Spintron test is 100 percent accurate.
#9
Melting Slicks
It's primary purpose is to test and evaluate variables in order to maximize performance and durability.
You can precisely identify, document and record crucial characteristics of the valve train such as valve bounce, lofting, spring harmonics, and pushrod deflection.
http://trendperform.com/spintron/about/
You can precisely identify, document and record crucial characteristics of the valve train such as valve bounce, lofting, spring harmonics, and pushrod deflection.
http://trendperform.com/spintron/about/
#10
Team Owner
I would love to see a gage R&R on a spin tron. Even same setup repeated 5 times so see the variation in testing.
#11
Team Owner
The 5 pounds was a misprint and the chair is actually a prototype stye chair not ready for the public......due to weight testing....
#12
Burning Brakes
It's primary purpose is to test and evaluate variables in order to maximize performance and durability.
You can precisely identify, document and record crucial characteristics of the valve train such as valve bounce, lofting, spring harmonics, and pushrod deflection.
http://trendperform.com/spintron/about/
You can precisely identify, document and record crucial characteristics of the valve train such as valve bounce, lofting, spring harmonics, and pushrod deflection.
http://trendperform.com/spintron/about/
#13
Drifting
That means things could only get worse. Some people are denying physics here.
#14
Le Mans Master
Yeah, but is he wearing shoes?
#15
#17
Le Mans Master
#18
Was the 4-leg chair's seat concentric to the 350lb man's rear? If not, it causes excessive wear of the chair and eventually drops a leg.
#19
#20
Team Owner
Seriously does anyone know the accuracy it is rated too? The reproducibility? Repeatability?
Throwing out one measurement in my field would never fly without knowing this stuff first? I would at least like to have seen the same test done enough times to compare groups to see if a statistically difference is there, not just A measure X and B measured Y.
Throwing out one measurement in my field would never fly without knowing this stuff first? I would at least like to have seen the same test done enough times to compare groups to see if a statistically difference is there, not just A measure X and B measured Y.