ashg
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| posted on 15/9/09 at 09:33 PM |
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Toothed Pulley Material
just a quick one.
i purchased a megajolt and all the necessary bits off a fellow forum member.
today i was having a good look at how i could fit it to crank pully on the engine.
i decided welding would be best. i got the pully out trigger wheel out to mock it up only to discover its made out of auminium.
now im no expert but i thought they had to be made out of a ferrous (magnetic) material to have an effect on the sensor?
so the question is. will the ali one work or do i bin it and buy a steel one?
[Edited on 15/9/09 by ashg]
Anything With Tits or Wheels Will cost you MONEY!!
Haynes Roadster (Finished)
Exocet (Finished & Sold)
New Project (Started)
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mediabloke
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| posted on 15/9/09 at 09:51 PM |
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Hi Ash. My immediate reaction was "nope, it won't work, scrap it and get a genuine one." But in theory, movement of the teeth
could generate eddy currents in a sensor ciruit. Not sure that this would work with Megajolt though - I can't see that the pulses generated in
a std sensor would be large enough to feed EDIS.
Francis.
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mangogrooveworkshop
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| posted on 15/9/09 at 10:01 PM |
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http://trigger-wheels.com/store/index1.html
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flak monkey
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| posted on 16/9/09 at 07:01 AM |
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Nope, needs to be a steel toothed wheel.
VR sensors require a ferrous maeterial to pass within 1-2mm of the end in order to generate the pulses.
Cheers,
David
Sera
http://www.motosera.com
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02GF74
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| posted on 16/9/09 at 07:06 AM |
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I'm with the monkey on this one.
seach my post about trigger wheels - I post contact details of geezer who would make a trigger wheel at 1/2 price of the one above - and he can make
it to your size. good kwaleetee too.
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ashg
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| posted on 16/9/09 at 07:51 AM |
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didnt think it would work. cant understand why someone would go to all the trouble of water cutting one in aluminium.
Anything With Tits or Wheels Will cost you MONEY!!
Haynes Roadster (Finished)
Exocet (Finished & Sold)
New Project (Started)
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blakep82
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| posted on 16/9/09 at 10:49 AM |
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cutting from ali would be the same trouble as cutting from steel. plus everyones on the mission for ultimate lightness. if ali worked then it does
make sense really
steel is the way. ali won't work.
[Edited on 16/9/09 by blakep82]
________________________
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don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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mediabloke
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| posted on 16/9/09 at 08:56 PM |
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Yep - the only ali sensor applications appear to be proximity-related rather than speed measurement. Plus, since most modern engines use ali for
lightness, you'd have a ready source of noise, even if VR was possible! 
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MikeRJ
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| posted on 16/9/09 at 09:23 PM |
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quote:
Originally posted by ashg
didnt think it would work. cant understand why someone would go to all the trouble of water cutting one in aluminium.
I agree with mediabloke, it will almost certainly give some signal since the sensor itself generates the magnetic field which will induce eddy
currents into the wheel, whose own magnetic field opposes the one in the sensor. However, this isn't how a variable reluctance sensor is
designed to operate, and the signal level will likely be far too low to be useful.
I suspect whoever had it made simply did not understand how the VR sensor operates.
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