so running 4 black springs instead of 2 black and 2 white on a LO206, would that keep the clutch engaged moreThat chart is actually somewhat misleading. Read the bottom where it says it’s not the lock up speed but when the shoe first touches. Probably need to add another 400 rpm for actual lockup.
Gary Lawson
Lawson Speed Shop
Softer springs or more weights would keep it engaged more. Engaged doesn’t actually mean it’s better if you are below peak torque thoughso running 4 black springs instead of 2 black and 2 white on a LO206, would that keep the clutch engaged more
I ran all white with a heavy weight in every hole. no bully ever out pulled meI run all white. Just wondering about the black and white.
Add 500 rpm to the chart as is my engine builder says 3000 so I want to look for 3500 on the chart and use those springs? Or look for 2500 and use those?^ exactly -- rule of thumb is to add 500 rpm to that chart.
That chart shows, what I refer to, as "chatter engagement" when the shoes just start to engage the drum.
Watch on your Mychron while you acellerate in a straight line -- the rpm should increase steadily, then drop, then increase some more, and likely drop another time or two. That very first time that you see the rpm drop is your actual clutch engagement rpm. Note, excessive drops after that indicate clutch chatter and would be indicative of the clutch needing maintenance.
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Thanks and God bless,
Brian Carlson
Carlson Racing Engines
Vector Cutz
www.CarlsonMotorsports.com
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33 years of service to the karting industry ~ 1Cor 9:24
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2500 and use thoseAdd 500 rpm to the chart as is my engine builder says 3000 so I want to look for 3500 on the chart and use those springs? Or look for 2500 and use those?
That's tough to do if the builder tells you 2800 (-500=2300) and the idle is 2400.2500 and use those
Do you have a Mychron?Add 500 rpm to the chart as is my engine builder says 3000 so I want to look for 3500 on the chart and use those springs? Or look for 2500 and use those?
Or you can check different spring set-ups with the scale method. (Bath scale between your front bumper and a solid wall.) This can be very hard on clutches though - be sure to not let the clutch get hot.
Yea, I'm definitely not a fan of it, but it is a shadetree way of finding out.I can see Al smiling up there at even the mention of this method on Bob's!