[Diy_efi] Strain gauge on engine mounts

[niche at iinet.net.au]

Best thing I can suggest is
to put strain gauges on the drive shaft and measure
its twist - you avoid a whole heap of other issues,
you just need a magnet and coil so its powered up
from rotation and a means to signal the torque, such
as RF pulses (pwm style) .

However, assuming all sorts of things, for the most
part the AFM is a fair indicator of power, and since
power = speed times torque you can work backwards

Rgds

mike



At 04:28 PM 19/04/05, you wrote:
>I would like to have a go at obtaining an output of my engines torque,
>possibly using strain gauges on the two engine mounting points.
>
>It should be possible to subtract the output from one to the other it
>should equal the torque being produced by the engine.
>
>Using one on each mounting point will, I hope, allow you to delete the
>effects of bumps in the road.
>
>The theory is that when you are accelerating on a smooth road one side will
>be in tension and the other side in compression.
>
>Going over a bump, each strain gauge will be compressed by the weight of
>the engine, but the difference should I think still equal the engine torque.
>
>There will obviously be calibration issues, but I am looking for a tuning
>aid rather than a definitive torque number.
>
>Measuring torque using the prop shaft would also be good, but making a
>flange to hold the strain gauges and then transmitting the information
>might be tricky, although I did find this
>http://www.a-tech.ca/sup_page/ATI2000/Ati2K_Radio.htm system which clamps
>to the prop shaft and looks a bit expensive for my budget.
>
>Hugh
>
>
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Regards from


Mike Massen
Perth, Western Australia
VL Commodore Fuse Rail that wont warp or melt !
http://niche.iinet.net.au