The BSA A7-A10 Forum

Technical => Lucas, Electrical, Ignition => Topic started by: roadrocket.chris on 13.11. 2012 18:21

Title: scitsu rev clock
Post by: roadrocket.chris on 13.11. 2012 18:21
hi can anyone help i have a scitsu rev clock on my rocket it has been back to the factory at my cost twice, and still does not work properly .it has a signal wire which runs down to the ht leads. can anyone suggest a way to shield the signal wire to see if that helps or any other solutions .thanks in advance chris.
Title: Re: scitsu rev clock
Post by: bonny on 13.11. 2012 23:53
Screened or shielded type wire is available for use in things like plc's or frequency inverters where radio interference can cause problems to the operation of the machinery they are connected to. Are you using the original wire that came with the rev clock ?     
Title: Re: scitsu rev clock
Post by: roadrocket.chris on 14.11. 2012 17:15
yes i am using the wire it came with it  just wont read passed 2 thousand revs and a very jumpy needle at that. anywhere you think i might get the wire you suggest in ireland.thanks chris.
Title: Re: scitsu rev clock
Post by: metalflake11 on 14.11. 2012 17:49
If you have the 'Auto' or the 'B1' model it won't work apparently.  *dunno*
Title: Re: scitsu rev clock
Post by: roadrocket.chris on 14.11. 2012 18:27
why do you say that they know what bike it was for when i bought it and twice it has been back to the factory  where work was not done which was promised.



here's a video i made of the problem

<iframe width="420" height="315" src="http://www.youtube.com/embed/nEZyAGrVyJE" frameborder="0" allowfullscreen></iframe> (http://<iframe width="420" height="315" src="http://www.youtube.com/embed/nEZyAGrVyJE" frameborder="0" allowfullscreen></iframe>)
Title: Re: scitsu rev clock
Post by: roadrocket.chris on 14.11. 2012 18:28
repost of the video

http://youtu.be/nEZyAGrVyJE (http://youtu.be/nEZyAGrVyJE)
Title: Re: scitsu rev clock
Post by: MG on 14.11. 2012 20:48
Just a thought, but does it make a difference which HT lead the pickup is attached to? Spark polarity on a twin magneto is different between left and right plug, maybe the rev counter electronics need the "correct" one to work properly?

On their site, Scitsu also mention an adjustable resistor in the pickup lead for use with magnetos, to tune the tach, see the link below. I couldn't see that in your video???

http://www.scitsu.co.uk/docs/magneto%20notes.htm (http://www.scitsu.co.uk/docs/magneto%20notes.htm)

Good luck with it!
Markus
Title: Re: scitsu rev clock
Post by: metalflake11 on 14.11. 2012 22:45
I am repeating what they say on the website. They may have known what it was for but still sent you the wrong one, brains seem to be in short supply these days!  *smile*........... MG could have a point so try swapping leads. Also any of this type of thing I have seen before have had the sensor wire coiled  around the lead like a spring rather than running along side. Good luck!
Title: Re: scitsu rev clock
Post by: warmshed on 17.11. 2012 09:57
 

You say in the video that " the wire goes in a "Z" round the other side"?  do I understand by this you have connected the wire or allowed it to run near BOTH HT leads? this would certainly cause you a problem as the pulses would try to cancel each other out once the revs rise.  Dave.
Title: Re: scitsu rev clock
Post by: roadrocket.chris on 17.11. 2012 17:28
This is the way scitzu told me to do it. I tried coiling it round the HT leads and that didn't work either
Title: Re: scitsu rev clock
Post by: warmshed on 18.11. 2012 10:17
Have you tried just one lead?, must work because it does on singles though may register just half of the speed. You could also try reversing the direction of the sensing lead on the second HT.
Title: Re: scitsu rev clock
Post by: MG on 18.11. 2012 10:29
According to Scitsu's fitment list connecting the pickup wire to both HT leads is correct for the "black" version of their rev counters. So unless they don't know how a twin magneto works (unlikely), changing the way the sensing lead is attached prolly won't be to any avail. Still, worth a try.

FWIW, I have recently tried one of these as a temporary way of monitoring revs on the A10 (just out of interest):
http://www.ebay.com/itm/Tach-Hour-Meter-For-Motorcycle-ATV-Snowmobile-Boat-Gas-Engine-Tachometer-Bike-/280929962699?pt=LH_DefaultDomain_0&hash=item4168bb0acb (http://www.ebay.com/itm/Tach-Hour-Meter-For-Motorcycle-ATV-Snowmobile-Boat-Gas-Engine-Tachometer-Bike-/280929962699?pt=LH_DefaultDomain_0&hash=item4168bb0acb)
The most useless piece of c**p I have bought in a long time. It takes about 4 seconds to react to any change in revs at all, and won't go above 4800 rpm, flat out, despite all my best efforts in trying different ways of attaching the pickup wire(s), numbers and direction of coiling, changing leads, connecting and disconnecting the ground wire etc. etc. Not worth the money, however little it is.
The hour meter option works okay though, so maybe useful for an old tractor... (non-Diesel  ;) )
Title: Re: scitsu rev clock
Post by: warmshed on 18.11. 2012 12:15
I agree their instructions should indicate the way they should be wired. The z method of connection is listed to connect both leads hoiwever there is a note:-

 "The 'Sensor Wire' between each spark plug lead should describe. a letter 'Z'. The current is then induced into the 'Sensor Wire' in the same direction from each of the HT leads."  

If the current direction is reversed on the second lead on the magneto then I would think you should reverse the direction the sense lead is taped to the second HT lead??
Title: Re: scitsu rev clock
Post by: roadrocket.chris on 18.11. 2012 15:59
i will try what warmshed suggests . i tried it on the ht lead on my golf car .lead from coil to distributor and it read double the revs i am getting to think its a pile of crap and the company has not been very helpful still i will keep trying.
Title: Re: scitsu rev clock
Post by: metalflake11 on 18.11. 2012 16:12
Wish I could help more but it's got me beat. *dunno*
Title: Re: scitsu rev clock
Post by: roadrocket.chris on 18.11. 2012 17:01
mg this one was not cheap its cost me 140 pounds sterling you would expect something better for that kind of money.
Title: Re: scitsu rev clock
Post by: bsa-bill on 18.11. 2012 17:18
Hi Chris
I'm watching this thread with interest, thought about this kind of set up some time ago but have got nowhere with it as yet (time and tide and so forth)

Quote
i tried it on the ht lead on my golf car .lead from coil to distributor and it read double the revs

How many cylinders does your golf buggy have, if it reads a pulse between coil and distributor will it not give 1 x no of cylinders - revs if a two stroke or 1 X no cylinders/2 for a four stroke.
I've looked at one or two of these and they sometimes have a facility to set them for the type of engine and number of cylinders.

One more bit of info just to add to the plot, I have a strobe light that works in a similar fashion, at least as long as you have the sender on the HT lead the right way around, if it's on back to front it doesn't read at all.

Not a great help I know, my suggestion (based knowledge gained by once examining a Perdio six transistor radio in 1962) is to try one turn at a time of the wire around the HT lead in one direction then the same in the other direction ( by direction I mean clockwise around the lead then anti clockwise)

Electronic experts can you please now get up of the floor and dust your selves down
Title: Re: scitsu rev clock
Post by: metalflake11 on 18.11. 2012 18:00
MG made a point earlier about an adjustable resistor on the pick up lead. In the link he posted, it does say that it needs to be tuned in as he says. Have you got one? If not, he could be on the nail with his post.
Title: Re: scitsu rev clock
Post by: roadrocket.chris on 18.11. 2012 18:43
sorry i did not make it clearer i meant my volkswagen golf motor car 1800cc    4 cylinder petrol engine as regards the resistor i tried with it no joy scitsu said try it without still no joy .what next.
Title: Re: scitsu rev clock
Post by: MG on 18.11. 2012 19:57
Hooking it up between coil and distributor on your Golf car(t) (*lol*) the unit sees 2 sparks per every full crank revolution. Hooked up to both HT leads on the magneto it should count 1 spark every revolution, so the number of pulses per minute the unit counts equals crank rpm on a parallel twin. So it MUST display twice the engine rpm when mounted to your Golf the way you did.
So far so good, the unit seems to work okay and be the one you want, the problem must be elsewhere.

Try mounting the pickup wire to ONE HT lead only and see if you can get correct measurement of HALF the engine rpm. If not, try adjusting the aforementioned potentiometer. If still no joy, reverse the direction of the pickup wire relative to the HT lead and try again. If successful, try the other HT lead alone and see if you need the same orientation of the pickup wire or not. This should give you an indication of how to mount the pickup wire to both HT leads correctly, unless you have tried all that already, then it's got me beat as well...

It's a shame the unit doesn't work properly for that sort of money, and the lack of support from the manufacturer is even more so!

Err, you are using non-resistor copper cables, plug caps and plugs, are you?
Title: Re: scitsu rev clock
Post by: metalflake11 on 18.11. 2012 20:51
Hooking it up between coil and distributor on your Golf car(t) (*lol*) the unit sees 2 sparks per every full crank revolution. Hooked up to both HT leads on the magneto it should count 1 spark every revolution, so the number of pulses per minute the unit counts equals crank rpm on a parallel twin. So it MUST display twice the engine rpm when mounted to your Golf the way you did.
So far so good, the unit seems to work okay and be the one you want, the problem must be elsewhere.

Try mounting the pickup wire to ONE HT lead only and see if you can get correct measurement of HALF the engine rpm. If not, try adjusting the aforementioned potentiometer. If still no joy, reverse the direction of the pickup wire relative to the HT lead and try again. If successful, try the other HT lead alone and see if you need the same orientation of the pickup wire or not. This should give you an indication of how to mount the pickup wire to both HT leads correctly, unless you have tried all that already, then it's got me beat as well...

It's a shame the unit doesn't work properly for that sort of money, and the lack of support from the manufacturer is even more so!

Err, you are using non-resistor copper cables, plug caps and plugs, are you?

.......Very good point! *yeah*
Title: Re: scitsu rev clock
Post by: roadrocket.chris on 19.11. 2012 17:24
hi lads tried with one lead no reading at all tried down one lead and up the other signal wire in u shape some improvement cant try on the road yet we have monsoon weather at the moment .just for good measure it had wet sumped  and blew oil out the breather over the shed floor  such is life.
Title: Re: scitsu rev clock
Post by: metalflake11 on 19.11. 2012 17:33
Hello Chris, what about the adjustable resistor?  HT leads, caps and plugs all non resistor?
Title: Re: scitsu rev clock
Post by: roadrocket.chris on 19.11. 2012 18:53
resistor   is set at minimum resistance or it wont work at all.copper leads and non resistor caps and plugs need some dry weather now.
Title: Re: scitsu rev clock
Post by: warmshed on 19.11. 2012 22:32
Have you tried reversing the direction of the second HT yet as mentioned in my previous post, looks a winner to me.
Title: Re: scitsu rev clock
Post by: roadrocket.chris on 20.11. 2012 16:51
hi warmshed i tried what you said it now reads up to 3 thousand revs some improvement i will get their some time i hope.
Title: Re: scitsu rev clock
Post by: warmshed on 21.11. 2012 00:34
Does it get upto 3k rpm when only one lead is connected?
Title: Re: scitsu rev clock
Post by: roadrocket.chris on 21.11. 2012 17:11
with one lead connected it does not work at all  its a little better  now goin down the left lead and up the right lead in the shape  of a u but not very smooth.
Title: Re: scitsu rev clock
Post by: warmshed on 23.11. 2012 00:15
Did you check using one feed with both HT leads? 3000rpm max is about half of what you need looks like its only reading one lead, and its not right to get zero reading with one lead connected.  Could try reversing the wire on the first ht, if you get a reading you maythem  need to try both orientations on the second ht lead.
Title: Re: scitsu rev clock
Post by: roadrocket.chris on 09.01. 2013 16:38
UPDATE

I got a comment out of the blue on my video from dylan stuchbury on 01/03/13

quote
''send it in for repair, if it's still under warranty
we'll sort it for free, if its old repairs are very economical.
 That's the quickest and best way to get it sorted.''

I don't know who this person is or his connection with scitzu.

I replied

quote
''Hi Dylan,
It was returned to Tony Dawson twice at 12 pound sterling a pop.
 The last time, it was sent, he told me on the phone he would alter it
 so it could be hardwired to the bike's own battery. It came back the same way it went,
 with a note saying try coiling the signal wire 6 times round each ht lead. All to no avail.
 You can see why I'm not very happy with it. I posted this on the A7 and A10 forum, and tried every suggestion made,
 without any success. Here's the link to the forum topic
http://www.a7a10.net/forum/index.php/topic,6367.0.html

I hope you can help, I don't want to waste any more money.
Kind Regards
Chris Whitehead.
Sent to: dylan stuchbury''

 haven't heard back, so I don't really know what is going on.

I tried all your recommendations with no success, so thanks lads, I'll keep you informed. *conf* *conf* *conf* *conf*
Title: Re: scitsu rev clock
Post by: bsa-bill on 09.01. 2013 16:44
Google search brought up this

http://www.cdrex.com/dylan-stuchbury/2622355.html (http://www.cdrex.com/dylan-stuchbury/2622355.html)

possibility but no guarantee it's him
Title: Re: scitsu rev clock
Post by: roadrocket.chris on 09.01. 2013 16:59
I've just checked the Scitsu site and this is what I found
quote
In January 2013 the manufacture and sales of the Scitsu brand was transferred to Woodview Electronics Ltd. Their experience in automotive electronics and instruments being supplemented by Tony Dawson continuing to act as Technical Consultant.

 *eek*

hope to hear from him.
Title: Re: scitsu rev clock
Post by: roadrocket.chris on 10.05. 2013 16:39
problem is now solved thanks again scitsu  your help much appreciated.