blakep82
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| posted on 12/11/08 at 11:01 PM |
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trigger wheel diameter
i know its best that the trigger wheel is slightly bigger diameter than the pulley, but suppose the outer diameter (outside the teeth) was exactly the
same as the pulley... would that be ok? i'm thinking with the sensor needing to be so close, the pulley shouldn't affect the sensor?
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BenB
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| posted on 12/11/08 at 11:12 PM |
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Presumably it depends on what material the pulley is made out of. If it was made out of a ferrous material it would "mask" the trigger
wheel and potentially stop a signal.
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mediabloke
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| posted on 13/11/08 at 12:18 AM |
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You'd also be faced with mounting the sensor at an angle to the teeth of the trigger wheel, which might generate an acceptable signal at low
revs, but the current / voltage of the pulses generated at higher revs may not be sufficient to give a constant reading to the EDIS module. I
wouldn't consider myself an expert, but I'd be expecting misfires or loss of advance at midrange / high revs if this was an issue.
Hope that helps,
Francis.
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triumphdave
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| posted on 13/11/08 at 01:08 AM |
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Mines about the same diameter,but spaced away from the pulley a little bit and works fine.
If you always do what you have always done you will always get what you have always got
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iank
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| posted on 13/11/08 at 01:15 AM |
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I'm guessing you've got a trigger wheel then 
Put a 5mm spacer (smaller diameter than teeth on trigger wheel and you'll be fine).
Edit: as ^^^ grrr must type quicker.
If you don't already have a wheel already it's probably easier to buy one than scavenge one and have to experiment to get a good signal (I
doubt most people have a scope they can use to set up).
http://trigger-wheels.com/ has lots of useful information an wheels in most sizes
mediabloke: I don't understand, why would the angle of the sensor have to change, surely you'd have to fabricate a bracket to suit anyway
so would keep it at 90 degrees.
[Edited on 13/11/08 by iank]
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
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02GF74
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| posted on 13/11/08 at 08:17 AM |
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quote:
Originally posted by iank
http://trigger-wheels.com/ has lots of useful information an wheels in most sizes
maybe so but at £ 20, far too expensive.
contact martinptownsend@aol.com; he'll laser cut you one to what ever size you want. I have 2, don't ask  , one a special with a larger
central hole that was cut unbelieveably accurately i.e I gave measurement to .1 mm and it came back spot on!. Oh, they are £ 10, I forget if it
includes postage.
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blakep82
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| posted on 13/11/08 at 08:25 AM |
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i haven't got one yet. saw one on ebay which was for a mini. the hole in the middle was perfect size for my pulley (as the same size as the
recess) but the outside was the same diameter as the outside of the pulley. was still about £18 delivered. better than trigger wheels and their £18
plus post.
I'll try martin townsend though 
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
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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mcerd1
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| posted on 13/11/08 at 08:57 AM |
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far from locost but I got this made:
http://s5.photobucket.com/albums/y170/mcerd1/Dax/08072008059.jpg
http://s5.photobucket.com/albums/y170/mcerd1/Dax/08072008060.jpg
its an alloy copy of a pinto pulley (cortina type) with a bit extra on the front for the ring type 36-1 (from triggerwheels.com)
he skimmed a little out of the centre of the trigger wheel on the lathe to make it a good fit
its going to get hard anodised soon - you don't want to know what the total cost is though 
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short track 123
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| posted on 13/11/08 at 01:26 PM |
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Nice looking part how thick is the trigger wheel ?
Jason
Shorttrack MotorSport Ltd
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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mcerd1
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| posted on 13/11/08 at 02:15 PM |
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Its 5mm thick
here's my drawing if anyones interested
(to suit a pinto with a cossie crank = +8mm on the nose length)
I've got it in AutoCAD if anyone needs it
[Edited on 13/11/08 by mcerd1]
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short track 123
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| posted on 13/11/08 at 02:45 PM |
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Thanks
Shorttrack MotorSport Ltd
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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blakep82
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| posted on 13/11/08 at 08:24 PM |
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quote:
Originally posted by short track 123
Nice looking part
he he he
sorry... emailed martin, looking good so, how much bigger diameter should the wheel be than the pulley?is it just so that the teeth go past the
pulley?
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
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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02GF74
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| posted on 20/11/08 at 11:03 AM |
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quote:
Originally posted by BenB
Presumably it depends on what material the pulley is made out of. If it was made out of a ferrous material it would "mask" the trigger
wheel and potentially stop a signal.
I don't think the metal to the side of the holes will affect operation.
If ya don't believe me, take a looksee here
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MikeRJ
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| posted on 20/11/08 at 04:02 PM |
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As long as the holes are larger than the tip of the VR sensor it will work correctly. If the hole size is too small, the output of the sensor will be
considerably reduced .
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