Author Topic: Fitting an Electronic Rev Counter?  (Read 6708 times)

Offline LJ.

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Fitting an Electronic Rev Counter?
« on: 15.12. 2011 10:51 »
How would you wire up an electronic rev counter to a magneto bike? I'd like to get a rev counter but as the chronometric ones are hard to come by... An electronic one seems a good alternative.

I'm thinking of Primary or secondary windings within the magneto and maybe a wire taken from the points, but I just dont know anything about this. Has anyone been down this route?
Ride Safely Lads! LJ.
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1940 BSA M20 500cc Girder/Rigid- (SOLD)
1947 BSA M21 600cc Girder/Rigid-Green
1949 BSA A7   500cc Girder/Plunger Star Twin-(SOLD)
1953 BSA B33  500cc Teles/Plunger-Maroon
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1961 BSA A10  650cc Golden Flash-Red

Offline Topdad

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Re: Fitting an Electronic Rev Counter?
« Reply #1 on: 15.12. 2011 11:18 »
Good morning LJ, Iwent down this route earlier this year BSABILL also expressed an interest ,SRM are producing copy tachos for A65's but haven't got plans for A10's until they are sure of the return on the tooling costs. I found aguy in the Netherlands who can provide a working unit which you have to fit in an old case or I'm told you can buy them from Wassells. He was charging babout £100 in euros and was very helpful ,i'll dig out the link I got and send it to you. It takes it's feed from the mag and just needs a pickup wire close to the mag's body to work. A norton dealer whose name escapes me used to sell another version which took its feed from the end cap(bakelite ) of the mag and thats what I was going to do ,money or lack of it put it on hold for this year for me however as I said I'll get the info to you later,best wishes |BobH
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Offline LJ.

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Re: Fitting an Electronic Rev Counter?
« Reply #2 on: 15.12. 2011 18:39 »
Thanks Bob will be interested to see the link. A built rev counter is costly and its hard to justify considering the counter is not read all that much. I'm looking for a repro one with an acceptable face to match the original Smiths speedo.
Ride Safely Lads! LJ.
**********************
1940 BSA M20 500cc Girder/Rigid- (SOLD)
1947 BSA M21 600cc Girder/Rigid-Green
1949 BSA A7   500cc Girder/Plunger Star Twin-(SOLD)
1953 BSA B33  500cc Teles/Plunger-Maroon
1961 BSA A10  650cc Golden Flash-Blue
1961 BSA A10  650cc Golden Flash-Red

Offline Topdad

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Re: Fitting an Electronic Rev Counter?
« Reply #3 on: 16.12. 2011 09:45 »
I'll try and do that today,re the repro look I'm sure there is someone I've seen on e-bay who sells the correct looking smiths speedo and tacho faces for just a couple of pounds,  that was where my masterplan was leading but cash will tell unfortunately, regards Bob.
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Online bsa-bill

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Re: Fitting an Electronic Rev Counter?
« Reply #4 on: 16.12. 2011 10:26 »
Quote
Good morning LJ, Iwent down this route earlier this year BSABILL also expressed an interest

Yep I'm still in the thinking stage though.

I'm sure there must be some way of turning a strobe into a rev counter, the strobe I have take it's pulse from a spark plug lead and turns it into a pulse of light, just need some gizmo to turn it into a count - it's out there somewhere - I'm thinking somewhere like Maplins might have the answer
All the best - Bill
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1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Offline chaterlea25

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Re: Fitting an Electronic Rev Counter?
« Reply #5 on: 16.12. 2011 11:10 »
Hi All,
Heres the link to the original supplier of the electronic tacho gizmo,  http://www.beckelektronika.nl/
Look at "NIEUWE PRODUCTEN" as its in Dutch

I have not yet gotten round to buying a couple of these gizmos for  some projects but have sourced some old speedo bodies and the internal castings that support the face , I am hoping to be able to run the signal wiring through an empty drive cable outer?????
(no usable Chronometric parts will be harmed to produce these  *smile* *smile* LOL)

Regards
John O R
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Offline roadrocket.chris

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Re: Fitting an Electronic Rev Counter?
« Reply #6 on: 19.12. 2011 18:07 »
hi i got one from scitzu for my rocket it works ok it has one wire which goes to the ht leads and has a rechargable battery inside a word of warning do not tape tightly to frame as it spoils the signal.

http://www.youtube.com/watch?v=o2hTqNmlcoU







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Offline kiwipom

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Re: Fitting an Electronic Rev Counter?
« Reply #7 on: 19.12. 2011 19:21 »
hi guys, i had a look at this site  http://www.beckelektronika.nl/
all in Dutch unfortunately but very good looking stuff. I emailed the owner to see if there was an English version,this is the reply,
Hello BoB,
 
I'm very sorry my site is not in English.
The reason is:
My English , especially technical, is to bad for a website more over every users manual has to be translated and that's not easy to do when you like to do it perfectly.
Another reason is : there is a lot of work for me here in the Netherlands and Belgium.
At this moment i can't do more.
 
So i'm very sorry to disappoint you.
Maybe we have someone on the forum who is able to translate, cheers,Bob
 
Best Regards, Hans Beck.

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Offline MG

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Re: Fitting an Electronic Rev Counter?
« Reply #8 on: 19.12. 2011 20:33 »
Hi kiwi!

Here goes, no liability accepted though, as Dutch is quite different to German.  *smile* But I think I got the basic information right:


Speedos:
These speedometers are designed specially for Smiths housings with an inner diameter of 75mm.
The unit is based on the servo-motor principle. So there is no vulnerable moving coil element inside!
The speedo hence is resistant to vibration and temperature variation.
The speedo works from 0 km/h ! and is equipped with a ??? (meerslagen, probably means multi-turn) potentiometer for fine-adjustment.
The input of the speedo receives an analog voltage from the ?generator?, that rises linearly with speed.
Available in 6V and 12V

The included ?generator?, which mounts onto the speedo drive, sends the speed signal via an electric cable, [?] making the fault-prone speedo cable unnecessary. (not totally sure, but I think I got the basic content right).

Note: The speedos are not equipped with odometers!

Rev counters:
These rev counters are designed specially for Smiths housings with an inner diameter of 75mm.
An ?antenna? picks up the required pulses from the HT lead.
Model A (top) and model B (bottom) are the standard dials, it is however possible to fit own dials with a minimum diameter of 70mm.
The needle rotates clockwise on A and B models, but it is also possible to reverse it?s operation (when using a different dial).
Display range can be modified for different dials.

Available for 1-2-3-4-6 or 8cylinder engines, 2 or 4 stroke. Operating voltage 6V or 12V (please state required voltage).

PS: The original illuminating bulb can be retained.


Cheers, Markus
1955 A7 Shooting Star
1956 A10 Golden Flash
1961 Matchless G12 CSR

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Online Triton Thrasher

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Re: Fitting an Electronic Rev Counter?
« Reply #9 on: 19.12. 2011 21:58 »
do not tape tightly to frame as it spoils the signal.


Maybe that's what's spoiling the signal on mine then.

It's Scitsu.


Offline roadrocket.chris

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Re: Fitting an Electronic Rev Counter?
« Reply #10 on: 20.12. 2011 18:19 »
hi tt the factory told me not to attach the wire tightly to the frame or anywhere also i had to take the resistor out of the wire to improve the signal strengh.try undoing all the the places it is taped to the bike and leave the wire loose  except on ht leads then try it .

good luck chris.
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Online Triton Thrasher

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Re: Fitting an Electronic Rev Counter?
« Reply #11 on: 20.12. 2011 22:14 »
Interesting.

Will do, thanks.

Online Triton Thrasher

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Re: Fitting an Electronic Rev Counter?
« Reply #12 on: 24.01. 2012 19:31 »
By George I think that worked!

Thanks.

Offline LJ.

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Re: Fitting an Electronic Rev Counter?
« Reply #13 on: 27.01. 2012 09:39 »
Updated!

Right, Well I bought one of those Rev Counter gizmo's from the guy in Holland, Hans Beck, and indeed I found him to be very helpful who insisted it worked correctly before I even paid! http://www.beckelektronika.nl/

The item when purchased is just a dial face with its electronics and three wires, as stated earlier in this thread, you have to provide your own casing. I found it very easy to fit and had the gadget working in no time. The instructions do state that you have to figure out the best place to attach the pick-up and although mine works very smoothly when rolling and bike is under load I'm finding a slight waving of the needle while the engine is ticking over, I'm wondering if this is normal with a magneto and better results would be gained with electronic ignition?

Here are some photos and a You Tube video shot of the the device in action.

http://youtu.be/_5Xp__fiY6g?hd=1

Also in the video while watching the ammeter and battery status monitor, you'll see the performance of my newly fitted DVR2 electronic regulator, another impressive bit of kit. The blue LED indicator is the high beam warning, red is an indicator to show me the brake light and switch is working correctly, and the small switch isolates the battery status monitor LED when bike is not in use. Can't you tell I like gadgets!  *lol*

Ride Safely Lads! LJ.
**********************
1940 BSA M20 500cc Girder/Rigid- (SOLD)
1947 BSA M21 600cc Girder/Rigid-Green
1949 BSA A7   500cc Girder/Plunger Star Twin-(SOLD)
1953 BSA B33  500cc Teles/Plunger-Maroon
1961 BSA A10  650cc Golden Flash-Blue
1961 BSA A10  650cc Golden Flash-Red

Offline Topdad

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Re: Fitting an Electronic Rev Counter?
« Reply #14 on: 27.01. 2012 11:12 »
Hi LJ, good of you to share this info ,it'll spur me on now to get one myself ! the unit appears very smooth I'd expected it to be more eratic ,I know this won't please the purists but looks to be a useful instrument rather than just for show. I only comunicated with Hans by e-mail and even then he was very helpful just a little difficult around the finer points due to his lack of english and my equal lack of any other language. What did he charge you if you don't mind my asking best wishes Bobh.
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