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df
United Kingdom
5994 Posts |
 Posted - 16 Sep 2012 : 11:27:34
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Below is a piccies of my tacho's, they are smiths 3" dials using magnetic pickups triggered from 4 slots at 90 degrees on the flywheels, one of them has always jumped about a bit between 1500 and 2500 (where I always run).
Does anyone know if they are tweakable to stop this happening?
As the boat is now 90 miles away it's not so easy to experiment.
NBAS--The communal colostomy bag of the boating community.
Visit leomagill.co.uk |
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adi-n-chez
United Kingdom
1980 Posts |
Posted - 20 Sep 2012 : 21:24:09
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Dave
just a thought - Swap the Tacho feedsfrom 1-2 & see if it still jumps - If so maybe it points to the feed ?
Adi
Sewer Tubes ? I'd rather have a D**ncr*ft (Only Kidding) |
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df
United Kingdom
5994 Posts |
Posted - 21 Sep 2012 : 00:10:47
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Thats the plan for this weekend, between pubs...
NBAS--The communal colostomy bag of the boating community.
Visit leomagill.co.uk |
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df
United Kingdom
5994 Posts |
Posted - 23 Sep 2012 : 15:45:13
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Well swapped the pickups and were mostly rock solid all weekend apart from a few minor ticks which changed side so that must be a pickup issue, now bought both home to re-calibrate from a signal generator as I'm sure they read different at the same rpm.
NBAS--The communal colostomy bag of the boating community.
Visit leomagill.co.uk |
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df
United Kingdom
5994 Posts |
Posted - 30 Sep 2012 : 12:33:37
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What a complete c0ck! Gone and broke the glass on one, looks like I may as well replace the pair and go alternator sensed, anyone modded their alternator for this? I assume it's just a wire soldered before the diode pack to one winding.( I have valeo alternators)
NBAS--The communal colostomy bag of the boating community.
Visit leomagill.co.uk |
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adi-n-chez
United Kingdom
1980 Posts |
Posted - 30 Sep 2012 : 18:15:45
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quote:
Originally posted by df
What a complete c0ck! Gone and broke the glass on one, looks like I may as well replace the pair and go alternator sensed, anyone modded their alternator for this? I assume it's just a wire soldered before the diode pack to one winding.( I have valeo alternators)
Thats How I would see it Dave , although I'm unfamiliar with Valeo - Dont want to tell you how to suck eggs , but if soldering onto the diode terminal (Pre diode) dont forget to stick a crock clip or something onto the diode leg to act as a heat sink as diodes hate heat !!
Edit - Of course you could just replace the glass..........
Adi
Sewer Tubes ? I'd rather have a D**ncr*ft (Only Kidding) |
Edited by - adi-n-chez on 30 Sep 2012 18:16:52 |
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df
United Kingdom
5994 Posts |
Posted - 07 Oct 2012 : 15:52:36
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2 new tachos working fine off alternators and calibrated to perfection, did most of the job outside a pub just to make sure....
Calibrated each tacho to it's respective engine as close possible then run a jumper between tachos and run one engine just to fine tune them to read the same (both alternators are the same type), definately sounds smoother when the revs read the same than it did before.
NBAS--The communal colostomy bag of the boating community.
Visit leomagill.co.uk |
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Tacho question
