fasteddie14
Member
Looking for the spring height of new red spring measured with calipiers
What spring height on new red spring off of clutch for a bulley clutch
- Thread starter fasteddie14
- Start date
CarlsonMotorsports
Site Supporter
Genuine Bully should take 1/2" springs (~.500".)
Make sure you don't use the clone/copy springs as they are considerably longer.
Also, don't just go by the spring relaxed oal. Check what they measure in a spring tester at installed height - that's what matters.
We go through a lot of effort/time to match springs on our Intercomp spring tester when we service clutches.
-----
Thanks and God bless,
Brian Carlson
Carlson Racing Engines
Vector Cutz
www.CarlsonMotorsports.com
Carlson Motorsports on Facebook
30 years of service to the karting industry
Linden, IN
765-339-4407
bcarlson@CarlsonMotorsports.com
Make sure you don't use the clone/copy springs as they are considerably longer.
Also, don't just go by the spring relaxed oal. Check what they measure in a spring tester at installed height - that's what matters.
We go through a lot of effort/time to match springs on our Intercomp spring tester when we service clutches.
-----
Thanks and God bless,Brian Carlson
Carlson Racing Engines
Vector Cutz
www.CarlsonMotorsports.com
Carlson Motorsports on Facebook
30 years of service to the karting industry
Linden, IN
765-339-4407
bcarlson@CarlsonMotorsports.com
alvin l nunley
Site Supporter
They do things so much differently than I am used to from my 2 cycle days regarding 4 cycle clutches. The only time we ever measured spring height was when we 1st put the clutch together. Just a starting point! After that, we would adjust the clutch stall RPM, at the track, to the peak torque RPM (from dyno testing) of the engine. But that was the dark ages!
CarlsonMotorsports
Site Supporter
Al, did you all ever check what the spring pressures were at installed height?
With mass produced springs, you see a lot of variance.
It's a painstaking effort we take to match the spring sets, but we feel it's worthwhile since everyone is setting these clutches up based on spring heights.
In a perfect world, we would come up with some sort of scale to measure the pressure it took to move the spring retainer (thinking like a valve spring tester for an assembled small block Chevy head.)
Since we know that we're running these springs in the installed range of ~.200" to .250", we try to aim for that resolution when we match springs using an Intercomp digital spring tester. The consistency of the clutch, wear, and performance is worth the effort in my opinion.
With mass produced springs, you see a lot of variance.
It's a painstaking effort we take to match the spring sets, but we feel it's worthwhile since everyone is setting these clutches up based on spring heights.
In a perfect world, we would come up with some sort of scale to measure the pressure it took to move the spring retainer (thinking like a valve spring tester for an assembled small block Chevy head.)
Since we know that we're running these springs in the installed range of ~.200" to .250", we try to aim for that resolution when we match springs using an Intercomp digital spring tester. The consistency of the clutch, wear, and performance is worth the effort in my opinion.