Hillard Flame engagment

So roughly 2500rpm.
This should help.
 

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That 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
 
^ 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.


-----
🏁Thanks and God bless,
Brian Carlson
Carlson Racing Engines
Vector Cutz
www.CarlsonMotorsports.com
Carlson Motorsports on Facebook
33 years of service to the karting industry ~ 1Cor 9:24
Linden, IN
765-339-4407
bcarlson@CarlsonMotorsports.com
 
gary10 said:
That 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
Click to expand...
so running 4 black springs instead of 2 black and 2 white on a LO206, would that keep the clutch engaged more
 
MikeB7372 said:
so running 4 black springs instead of 2 black and 2 white on a LO206, would that keep the clutch engaged more
Click to expand...
Softer springs or more weights would keep it engaged more. Engaged doesn’t actually mean it’s better if you are below peak torque though
 
With as flat as the torque curve is on these engines, I'd rather err under the peak than over it on a track that might cause enough drop in rpm to disengage the clutch.
Rarely is engaging and disengaging the clutch on every lap going to result in better lap times than engaging it once at the drop of the green flag.
There are exceptions to be sure, but they would be very technical tracks with very slow hairpin corners.
 
So would two white and two black springs be too much engagement for a box stock predator. I think peak torque is around 3600. The black and white springs are supposed to be 3400. Thanks
 
CarlsonMotorsports said:
^ 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.


-----
🏁Thanks and God bless,
Brian Carlson
Carlson Racing Engines
Vector Cutz
www.CarlsonMotorsports.com
Carlson Motorsports on Facebook
33 years of service to the karting industry ~ 1Cor 9:24
Linden, IN
765-339-4407
bcarlson@CarlsonMotorsports.com
Click to expand...
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?
 
Patkohns said:
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?
Click to expand...
Do you have a Mychron?
It's so easy to see clutch engagement on a tach.
If you have the ability to configure it to show analog (or graph) or even to a laptop, then it's even easier.

Get the engine and clutch warmed up slightly. With the kart on the ground and you in the kart - From a dead stop @ idle, go full throttle.
Keep the car in a straight line (parking lot, driveway, leaving the grid, etc.) and watch the rpm increase... 2800,3000,3200,3400,3600,3800,4000,^3400,3600,3800...The very first time the rpm drops is your engagement rpm (ie 3400 in this case.) It will continue to climb again, and may even drop a few more times (ie chatter), but the very first time it drops is the engagement I am looking for. It is so easy to see on replay or downloaded to your laptop with Aim's software.

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.


-----
🏁Thanks and God bless,
Brian Carlson
Carlson Racing Engines
Vector Cutz
www.CarlsonMotorsports.com
Carlson Motorsports on Facebook
www.youtube.com
35 years of service to the karting industry ~ 1Cor 9:24
Linden, IN
765-339-4407
bcarlson@CarlsonMotorsports.com
 
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