Pinch valve question?

Bill Baer · 09-15-2011, 09:53 AM

Chris
I always pretty much considered pneumatics to simple and reliable but after reading this I started looking at the stroke times (i.e the time from the point the stop turns off until it reaches 100% throttle) and found that it varied +/-.02.
It's uses air (Co2) to stroke both ways
I'm thinking that the friction that needs to be overcome in the cylinder and the linkage could be a factor so I purchased the correct air cylinder lube and upped my lube frequency on the throttle shafts and linkage and will continue to monitor the data/stroke times to see if they become more consistent.
But what I'm wondering is if I need to consider doing some testing without the pinch valve? I shift on the stop and come off the stop in high gear so it's possible that the pinch valve and subsequent slow throttle opening may not be necessary to control wheel spin but as I said I have never tried it without one and was wondering if someone else has?

09-15-2011, 09:53 AM	#4
Bill Baer Senior Member Join Date: Jul 2007 Location: Nothern IL Posts: 596 Likes: 1 Liked 1 Time in 1 Post	Re: Pinch valve question? Chris I always pretty much considered pneumatics to simple and reliable but after reading this I started looking at the stroke times (i.e the time from the point the stop turns off until it reaches 100% throttle) and found that it varied +/-.02. It's uses air (Co2) to stroke both ways I'm thinking that the friction that needs to be overcome in the cylinder and the linkage could be a factor so I purchased the correct air cylinder lube and upped my lube frequency on the throttle shafts and linkage and will continue to monitor the data/stroke times to see if they become more consistent. But what I'm wondering is if I need to consider doing some testing without the pinch valve? I shift on the stop and come off the stop in high gear so it's possible that the pinch valve and subsequent slow throttle opening may not be necessary to control wheel spin but as I said I have never tried it without one and was wondering if someone else has? __________________ Bill Baer 3391 SC, 339B SC, QR Last edited by Bill Baer; 09-15-2011 at 09:56 AM.