MarkC

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.

JwT

Oh no you didn't. Man did you read the dropped valve thread and how fast it spiraled down the tubes? Expect the same here. For some reason some guys here can't respond in a mature, respectful manner and this thread will be no different. Oh well...too late now, hold on for the ride

Michael_D

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.

sublime1996525

BAM!!!

ctsv510

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?

Rupert pupkin

^^POOR CHAIR^^

Subd for the MADNESS!! lol

JwT---LOL

forg0tmypen

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?

cruzin2

I believe the concept is to have the ability to spin "something" like a valve train and use a laser to measure accurately how the valve train acts; Valve to cam interaction / stability, etc. This helps you measure complicated architectures like a cam with spring loaded valves that are still hard to model with computers.

erick_e

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/

Unreal

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.

sublime1996525

The 5 pounds was a misprint and the chair is actually a prototype stye chair not ready for the public......due to weight testing....

QKSLVRZ

Exactly. I for one think measurement is far more useful that trial and error. But you do have to understand what the measurements really say.

wolf8218

In the best conditions possible (no forces enacted by internal combustion) this valve/spring combination will show X mm of bounce.

That means things could only get worse. Some people are denying physics here.

VetteVinnie

Yeah, but is he wearing shoes?

forg0tmypen

As reasonable as your explainations sound, I strongly disagree with them and you are not to be trusted now or in the future.

forg0tmypen

Are you done piling on yet! This is a serious discussion.

VetteVinnie

Are you guys done arguing about valvetrain issues yet? No? Then get used to it.

So the goal here is to continue to try to discredit Katech by attacking the test equipment itself? Got it.

Jawnathin

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.

forg0tmypen

I forgot the /sarcasm tag.

Unreal

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.