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Old 04-20-2014, 01:49 PM   #1
bmweuro OP
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Tachometer Ratio

Anyone have the answer?
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Old 04-20-2014, 01:51 PM   #2
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42.............Unless you actually provide us with an question
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Old 04-20-2014, 01:54 PM   #3
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Quote:
Originally Posted by jellycow View Post
42.............Unless you actually provide us with an question
Tachometer Ratio
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Old 04-20-2014, 02:26 PM   #4
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I agree that 42 is the answer for everything in life but not for my current question:)

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Old 04-20-2014, 02:31 PM   #5
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If you are looking for input rpm at the cable vs. readout on the tach, I know it is 1:2 for the /5 bikes. That is, if the cable is turning at 3000 rpm the tach should read 6000. Not sure what it is for other models, though.
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Old 04-20-2014, 11:42 PM   #6
Wirespokes
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JGT nailed it. The tach reads twice as fast as the input.
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Old 04-21-2014, 12:52 AM   #7
Voltaire
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What do you need to know for electronic ones? My race bike tacho did not like 8000 rpm and the needle fell off....
Thinking aftermarket of oilhead one...? probably need one that reads to 10k for the next engine.
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Old 04-21-2014, 10:40 AM   #8
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What do you need to know for electronic ones? My race bike tacho did not like 8000 rpm and the needle fell off....
Thinking aftermarket of oilhead one...? probably need one that reads to 10k for the next engine.
On the race bikes we have always used the oilhead tachs.
I'm looking for something small for my shop truck(/2 conversion).
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Old 04-21-2014, 10:46 AM   #9
knary
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Do most mechanical tachs use the same kind of connection?
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Old 04-21-2014, 11:06 AM   #10
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Do most mechanical tachs use the same kind of connection?
I would think the cable ends would be bike specific.
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Old 04-21-2014, 11:14 AM   #11
knary
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Originally Posted by bmweuro View Post
I would think the cable ends would be bike specific.
That's what I always assumed. Or that they'd certainly be in the case of a certain German manufacturer.
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Old 04-21-2014, 04:07 PM   #12
pommie john
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Quote:
Originally Posted by bmweuro View Post
On the race bikes we have always used the oilhead tachs.
I'm looking for something small for my shop truck(/2 conversion).


I use one of these on my little Honda, they're available in various ratios, I'm
not sure about a 2:1 version though.

http://www.dimecitycycles.com/vintag...-15-0033w.html


EDIT: Here you go, neat little 2.5" tacho in 2:1 ( It's described as a Harley fitment so that may put you off :) )

http://www.ebay.com.au/itm/like/2612...=true&lpid=107
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pommie john screwed with this post 04-21-2014 at 11:48 PM
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