Bicycle Tachometer on 6-1?

[kenr7101]

Just came from the bike shop and they have a very clean looking electronic tach/speedometer.  It has two pick ups one for RPM the other for MPH.  Uses a small round magnet about the size of the balance holes in my flywheels, has someone already done this? would this small magnet effect balance much?  Would make a very clean set up.

[xyzer]

Just came from the bike shop and they have a very clean looking electronic tach/speedometer.  It has two pick ups one for RPM the other for MPH.  Uses a small round magnet about the size of the balance holes in my flywheels, has someone already done this? would this small magnet effect balance much?  Would make a very clean set up.

I don't think the weight would be noticed........Bike....or.... Bicycle? must be Bike with a tach.....

[aqmxv]

Actually, it's a bicycle cyclometer.  The wheel pickup reads in kph or mph and is diameter adjustable (usually infinitely so) to get a correct reading with any tire and wheel.  The second pickup reads directly in RPM and displays crank cadence.

Cateye is one popular brand.  The current hot ticket is a cyclometer that does these usual things and also has a torque sensor in the rear hub.  There's enough brains in the cyclometer to do the math against wheel RPM and get instantaneous power output in Watts.  There's also recording functions, of course.  Very convenient for training purposes.

[duh]

Already been done and works excellent!
http://www.diesel-bike.com/Lister_Gen/Videos/Lister_Bike_Tach.wmv
http://www.diesel-bike.com/Lister_Gen/Videos/Lister_Tach_Sensor.wmv

[Firebrick]

Here is something made for the purpose, they work very well and have an hour meter and service meter on them as well

http://www.tinytach.com/tinytach/diesel.php

Probably not that much more expensive either

[rcavictim]

That`s a pretty good idea.  I see excersise bycycles and other exercise machines every once in a while at the dump and have stolen a few of the digital displays which I recall sometimes had a pickup (probably magnetic Hall Effect sensor).  I will have to go see if I got any with a sensor.  Might be of some use.

For rev counting now I just apply math to what my AC frequency meter reads on my gensets since I know the drive ratio relationship (1 to 1 with 4-pole head)  60 Hz = 1800 RPM.  40 Hz = 1200 RPM, 30 Hz = 900 RPM, etc.