philw
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| posted on 16/6/09 at 12:37 PM |
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Arrgh! speedo magnets
I'm really jarred off with these, i've lost about 20, so i decided to try a different size(smaller) now the speedo is 20mph out at 30mph
and gets worse the faster you go any ideas?
Must try harder
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Ben_Copeland
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| posted on 16/6/09 at 12:42 PM |
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If the sensor is further away now do to smaller (thinner) magnets then it can affect accuracy.
Are you using 2 part adhesive? rubbing it down with sand paper before so its nice and clean metal?
Ben
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Z20LET Astra Turbo, into a Haynes
Roadster
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02GF74
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| posted on 16/6/09 at 12:47 PM |
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remember centripetal force - the further away from the centre, the greate it is.
so mount them to the prop as opposed to the flange.
or fork out for the gearbox adapter, £ 20 and a sender unit.
or sensor make your own like I did.
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marmot0
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| posted on 16/6/09 at 12:48 PM |
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Or mount them to the output shaft on the diff. turning a bit slower than the prop, mine have not fallen off yet
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philw
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| posted on 16/6/09 at 12:51 PM |
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quote:
Originally posted by Ben_Copeland
If the sensor is further away now do to smaller (thinner) magnets then it can affect accuracy.
Are you using 2 part adhesive? rubbing it down with sand paper before so its nice and clean metal?
I have used Araldite and rubbed it clean enough to eat food from then scored the surface degreased then the 2 part epoxy, as for the sensor i
adjusted it for the smaller magnets.
I'm just wondering they may have a bigger surface area would this cause the problem?
Must try harder
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philw
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| posted on 16/6/09 at 12:54 PM |
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quote:
Originally posted by marmot0
Or mount them to the output shaft on the diff. turning a bit slower than the prop, mine have not fallen off yet
It's a Live axle
Must try harder
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flak monkey
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| posted on 16/6/09 at 01:29 PM |
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Stuck mine to the output flange of the diff with PU adhesive, not come off yet. Pretty much covered the magnet with it though!
Your smaller magnets might not be powerful enough to trip the sensor at speed? The magnets are usually pretty strong.
Sera
http://www.motosera.com
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Ben_Copeland
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| posted on 16/6/09 at 01:40 PM |
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I've got a load of magnets if you need any. Can stick them in the post to you for nothing. Worked fine and are probably the right size for
your needs.
Ben
Locost Map on Google Maps
Z20LET Astra Turbo, into a Haynes
Roadster
Enter Your Details Here
http://www.facebook.com/EquinoxProducts for all your bodywork needs!
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phoenix70
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| posted on 16/6/09 at 01:59 PM |
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I drilled a small hole to sit each magnet in, then used araldite all around to hold it .
Not lost one yet .....
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BenB
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| posted on 16/6/09 at 02:24 PM |
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Drilling holes in the propshaft??!?!? 
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iank
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| posted on 16/6/09 at 02:28 PM |
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Current magnets will be too small for the sensor and it's missing pulses, this gets worse the faster the magnets pass the sensor (maybe fixable
if you move the sensor closer, but that depends on how true the rotating part rotates).
Duct tape works well to keep them on if glueing isn't working.
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
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blakep82
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| posted on 16/6/09 at 03:01 PM |
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i got the sensor from burton power. the ali adapter fits in the type 9 box, and there is a ford sensor that goes with it, not cheap though, but more
reliable than magnets and glue and lining up sensors and stuff.
apparently, the adapter takes many other manufacturers sensors. haven't tried though, but you might be able to pick something up from a scrappy
________________________
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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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miikae
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| posted on 16/6/09 at 03:31 PM |
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Burtons have both the sensor and the adapter on ebay at the moment
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWAX:IT&item=150328207699
http://cgi.ebay.co.uk/Electronic-Speedo-Adaptor-Ford-Type-9-Type-E-Rocket_W0QQitemZ150343138837QQcmdZViewItemQQptZUK_CarsParts_Vehicles_CarParts_SM?ha
sh=item2301263e15&_trksid=p4634.c0.m14.l1262&_trkparms=%7C301%3A1%7C293%3A1%7C294%3A30
After useing Araldite i then applied tape around them all , none have fallen off as yet . I suppose ever little helps.
I may even go down the gearbox sensor route in the future though.
Mike
If it can be done it i will be done .
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hicost blade
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| posted on 16/6/09 at 04:14 PM |
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Why not use a:
https://www.burtonpower.com/product_main.aspx?dets_product.aspx?PSet=97&sTxt=ss34
No magnets required, just picks up on bolt heads
Dave
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LBMEFM
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| posted on 16/6/09 at 08:56 PM |
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Measured the circumference of my prop shaft divided it by nine cut the tape to the same length of the prop shaft circumference and then stuck the
magnets a regular interveal to the tape. Put another layer of tape over the top. Held the tape end to the prop and pushed the car to wind on the
magnets. I then used a cable tie at each end of the magnets. The whole thing was then covered with gaffer tape. The signal is good and the magnets
stay inplace. Barry
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