my-chron II

Steve Phaneuf · Joined: 18 Jul 2001 Posts: 15 Location: San Gabriel,Ca.

Is there a difference between the bracket for the speed sensor that goes on the spindle on a 100cc kart(no front Brakes) and a 125

John Neilson · Posted: Thu Jul 19, 2001 7:34 pm Post subject: my-chron II

Yes,
Generally I have only seen wheelspeed pickups on 125's at the axle.

Personally I like to see them on front wheels. Less chance of locking a wheel and skewing the data.

Steve Phaneuf · Joined: 18 Jul 2001 Posts: 15 Location: San Gabriel,Ca.

I have seen them on the axle also but I don't see how your getting good readings without spikes, like dumping the clutch, I wonder if they even make a spindle mount sensor for front brake kart

John Neilson · Posted: Fri Jul 20, 2001 5:50 am Post subject: my-chron II

Steve, You are correct. The data will slew with wheelspin and under braking. I have been making my own magnets for the front wheel pickups. You can get the magnets from McMaster Carr. The problem with the front brakes on a 125, is the amount of ferrous metal (disk) next to the sensor. If the hub is nonferrous, you might be able to bury a magnet over the bearing and use a standard pickup. E-mail me if you want to pursue this. John

Tony Gaylord · Posted: Fri Jul 20, 2001 7:16 am Post subject: my-chron II

I think if you drop by http://www.RSwyers.com you'll see how this was done on Ronnies kart. Theres a pic there, and a description of the mounting of the speed sensor....

Shortcut to the photo of sensor: http://www.rswyers.com/2001_karting_technical_pics.htm

Regards,
*TG*

[ July 20, 2001: Message edited by: Tony Gaylord ]

Kevin Callahan · Posted: Fri Jul 20, 2001 5:04 pm Post subject: my-chron II

Great topic!!! Especially since I'm installing a Mychron 2 on my new shifter tomorrow! Here's my question...The book says install the sensor 2-5 mm from the magnet. How far is that in American? 1/8 inch? 1/4 inch? Thanks

Steve Phaneuf · Joined: 18 Jul 2001 Posts: 15 Location: San Gabriel,Ca.

kevin,

what kind of sensor did your my-chron come with because if you have the spindle mount I don't think you'll be able to do it with the brake being there, sound like axle mounting is the only some what easy way.

Erik Frank · Posted: Fri Jul 20, 2001 8:03 pm Post subject: my-chron II

quote:
Originally posted by Kevin Callahan:
Great topic!!! Especially since I'm installing a Mychron 2 on my new shifter tomorrow! Here's my question...The book says install the sensor 2-5 mm from the magnet. How far is that in American? 1/8 inch? 1/4 inch? Thanks

English:
.079" to .197" since you asked....

Kevin Callahan · Posted: Sat Jul 21, 2001 1:04 pm Post subject: my-chron II

Hi Steve,

Taking a break from the Mychron installation and saw your post. I'm trying to mount the speed sensor to the rear axle. I got the kit from AIM with the axle collar for the magnet and a bracket for the sensor which is pretty worthless since the bracket and sensor still need some homemade piece to mount them to the frame that is what I'm struggling with now. The current thinking is to get a bar that I can bend 90 dgrees at the right place and drill a hole for the sensor and then use the double nuts that come with the sensor as a way to fine-tune the air gap between the magnet and sensor. All other suggestions greatly appreciated!