BMW K bikes (Bricks)

You are not connected. Please login or register

View previous topic View next topic Go down  Message [Page 1 of 1]


1Back to top Go down    Acewell RPM indication on Tue Sep 13, 2016 7:20 pm

Oliveri

avatar
Silver member
Silver member
Ok, so i recently installed an Acewell-2853 and used the Blue/Black [16] wire coming from the coil. However, it's 'jumping' up and down the rev-range. I've heard that using a resistor 'cleans up' the signal and eliminates this. After doing some research, I've come across this:

1.)

Brown [Ground]
|
|
Ace-2853 (Yellow) 100K ohm 0.5 W resistor
\ /
\ /
|
10 nF 630V capacitor
|
|
Coil
Blue/Black [16]


2.)

Ace-2853 (Yellow)
|
|
10K ohm 0.5 W resistor [15K or 20k if higher resistance is required]
|
|
Coil
Blue/Black [16]

Any experience with either of these suggestions? Which would be the preferred solution?


__________________________________________________
"Keep the paint up, and the rubber down
1988 K100RT...#0096960 ..."Heisenberg"...Status: Work in progress
http://www.vintagesteelworks.com
    

2Back to top Go down    Re: Acewell RPM indication on Wed Sep 14, 2016 12:04 am

KJustin

avatar
Silver member
Silver member
I had the exact same problem with the same Acewell. Take a look at this thread from the motobrick forum.http://www.motobrick.com/index.php?topic=6814.0

I tried both the solution in reply 2 and reply 4. The former helped, but didn't totally solve the problem. The second totally solved the problem.


__________________________________________________
1985 K100 Cafe Racer (formerly an RT), VIN 0051736
    

3Back to top Go down    Re: Acewell RPM indication on Wed Sep 14, 2016 12:31 am

charlie99

avatar
VIP
VIP
can I add that the guys in that post used a general purpose type diode that are not known to conduct well at higher frequencies

the old silicon diode in914 in4148 etc is rated up to hundreds of thousands of hertz

what were looking for here is something that switches on fast ....and ...switches off fast

perhaps any schotky (very fast ) diode (rated for higher voltages than 100 v) will do a far better job ...

just to add to the conundrum


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

4Back to top Go down    Re: Acewell RPM indication on Wed Sep 14, 2016 5:19 am

Dai

avatar
Life time member
Life time member
I'm in agreement with Charlie. When it comes to fast switching, use a schottky diode. In this case it's not so much the total frequency that a diode is capable of switching, but as Charlie says, how fast it can switch on and off.


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

5Back to top Go down    Re: Acewell RPM indication on Wed Sep 14, 2016 11:26 am

Oliveri

avatar
Silver member
Silver member
Great, now I'm almost more confused that before. Ok, so has anyone with an Acewell used any of my first mentioned options? Has it worked?

If not is there anyone that can explain ( inc. diagram for a 10 year old) how to fix it for certain. Yes, again pretend I'm 10.
Sorry, my electronic understanding is a bit like but I'm learning.


__________________________________________________
"Keep the paint up, and the rubber down
1988 K100RT...#0096960 ..."Heisenberg"...Status: Work in progress
http://www.vintagesteelworks.com
    

6Back to top Go down    Re: Acewell RPM indication on Thu Sep 15, 2016 6:23 am

Dai

avatar
Life time member
Life time member
On the diagram in post 4 that shows a 1n4007 diode, replace that diode with a 1n5819. Your local electronics shop will sell you the right component. I don't have an Acewell speedo but it should fix the problem permanently.


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

7Back to top Go down    Re: Acewell RPM indication on Thu Sep 15, 2016 7:17 am

Oliveri

avatar
Silver member
Silver member
Thanks again everyone for your time & knowlage. Will do exactly that ...
Question: the 33k and 10k resistors how many watts? Same for the cap, how many V's? Or did I miss that somewhere?


__________________________________________________
"Keep the paint up, and the rubber down
1988 K100RT...#0096960 ..."Heisenberg"...Status: Work in progress
http://www.vintagesteelworks.com
    

8Back to top Go down    Re: Acewell RPM indication on Thu Sep 15, 2016 11:40 am

Brad-Man

avatar
Life time member
Life time member
Looks like post #2 had .5 watt for the resistor...


__________________________________________________
Toys don't make the man - Man makes the toys....
    

View previous topic View next topic Back to top  Message [Page 1 of 1]

Permissions in this forum:
You cannot reply to topics in this forum