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› Tech Question - Speedometer
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Tech Question - Speedometer (Read 2 times)
tankerblaze
Ex Member
Tech Question - Speedometer
01/16/06 at 22:38:29
Hello all...
Simple question, not so simple to find answer:
Speedo cable RPMs at 60 mph?
I'm looking to replace the speedo with one from Autometer. Aside from looker much more badass, their mechanical speedos also feature trip meters, something I've wanted for some time. Autometer already has an outsource shop that makes adapters to change the speedo cable ratio to whatever I/we need, but I can't find the data anywhere...
-tanker out
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Hammy211
Ex Member
Re: Tech Question - Speedometer
Reply #1 -
01/16/06 at 23:52:41
Scroll down!!
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torque
Serious Thumper
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2008 nightster,flat
od green and black
Posts: 748
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Re: Tech Question - Speedometer
Reply #2 -
01/17/06 at 07:58:04
i put my drills on the end of the cable and found that the black and decker 1400rpm,got it to 40 mph,and the hitachi 2900 rpm got it to 85mph. hope this helps in some odd way
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tankerblaze
Ex Member
Re: Tech Question - Speedometer
Reply #3 -
01/17/06 at 10:45:50
Torque... you're the man!
If you're numbers are correct we can deduce that:
if
40=60
1400= X
Then
40x = 1400*60
40x = 84000
40x/40 = 84000/40
x=2100
Answer to my original question is:
2100RPM to 60MPH for a stock Savage
to make the Autometer Mechanical Speedo work u need a 21 to 10 gear ratio changer. I'll keep ya'll posted when I get the changes done!
-Tanker out!
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iKrayg
Ex Member
Re: Tech Question - Speedometer
Reply #4 -
01/19/06 at 20:04:21
Badass! Yeah, please post pictures. Which Autometer model are you looking to installing?
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Steve530
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Knoxville, TN
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Re: Tech Question - Speedometer
Reply #5 -
01/19/06 at 20:30:58
And if you use the other data point:
2900/85=x/60
x= 2047
That's about 2% error which is probably closer than the speedo.
Steve
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'97 Black / 1/2 white spacer
155 main jet / 55 pilot jet / Dyna muffler
snorkel removed / K&N drop in / seat raised
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threezukes
Ex Member
Re: Tech Question - Speedometer
Reply #6 -
01/20/06 at 07:11:33
Is the stock speedo really correct anyways? Overhere they have these little mobile units that they set up on the side of the road that displays your speed as you drive by. They always read a little slower then my stock speedo, but they seem to match my bicycle speedo.
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Savage_Greg
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Re: Tech Question - Speedometer
Reply #7 -
01/20/06 at 08:43:30
I had heard that the speedo drive is a ratio of 2:1.
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BS37066
Ex Member
Re: Tech Question - Speedometer
Reply #8 -
01/20/06 at 10:02:34
Now that you mention it, I've always found those mobile units always agree with the speedometer in whatever vehicle I'm riding or driving. I was clocked on both my bike and cage the other day and they appeared spot dead on.
I don't think I've ever heard anyone that has argued that they were caught on radar and it was way off the speed they thought they were doing.
Anybody have different experience?
threezukes wrote
on 12/31/69 at 16:00:01:
Is the stock speedo really correct anyways? Overhere they have these little mobile units that they set up on the side of the road that displays your speed as you drive by. They always read a little slower then my stock speedo, but they seem to match my bicycle speedo.
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torque
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od green and black
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Re: Tech Question - Speedometer
Reply #9 -
01/20/06 at 10:33:21
threezukes wrote
on 12/31/69 at 16:00:01:
Is the stock speedo really correct anyways? .
not if if u have a taller tire on ur bike
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tankerblaze
Ex Member
Re: Tech Question - Speedometer
Reply #10 -
01/28/06 at 21:51:32
Here's my selection from autometer... looks beautiful and will fit...
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Dynobob
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Re: Tech Question - Speedometer
Reply #11 -
01/28/06 at 23:30:12
BS37066 wrote
on 12/31/69 at 16:00:01:
I don't think I've ever heard anyone that has argued that they were caught on radar and it was way off the speed they thought they were doing.
Anybody have different experience?
All Honda cruiser speedometers are off about 5 mph at 60. That would be 8.33 percent off. I guess it keeps bikers' speeds down
Autometer guages are really really nice. I used to use them in my car.
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working_class_chop
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Re: Tech Question - Speedometer
Reply #12 -
01/29/06 at 05:52:34
Savage_Greg wrote
on 12/31/69 at 16:00:01:
I had heard that the speedo drive is a ratio of 2:1.
I believe the proper ratio is 2.1:1 or at least that is the ratio of all the speedos we sell.
What size speedo is needed for the sock housing??
I did a recessed 2" speedo on our savage, but we altered the tank mount for that, what size is the stock opening?
chop whatcha got
-Steve
http://www.workingclasschoppers.com
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chop whatcha' got
-steve
www.workingclasschoppers.com
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