| [ Total Views: 898 | Total Replies: 12 | Thread Id: 102013 ] |
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 psimitar
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| posted on May 14th, 2013 at 12:04 AM |
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What does this Speedo marking mean
So got an old mph speedo to play with and wondering what the W0.8 stamped on the back means?
There is nothing to state how many revolutions per mile the speedo goes like an old Smiths gauge would so I'm wondering if this is the worm drive
ratio?
Fancy playing with making it a KPH speedo as it's easy enough to screen print the dial from MPH to KPH but the odometer is the trickier part.
Ta 
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 matberry
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| posted on May 14th, 2013 at 08:00 AM |
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Your onto it, it;s the internal preset ratio
All VDO are like that so I'm sure google will tell more details
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
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Joel
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| posted on May 14th, 2013 at 09:49 AM |
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Its the code for what size tyres the speedo is meant to be fitted with.
There was a list on Thesamba about what tyres for what code, but I'm sure from memory the late Beetle 25.3" tyres was W0.51
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psimitar
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| posted on May 16th, 2013 at 12:55 AM |
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Yea, I've been playing around with it and doing some calcs and for std Beetle tyre diameter your looking at 800 revolutions and as speedos are given
in respect to every 1000 revs then the 0.8 is this ratio. Basically the last worm and cog of the odometer sets the ratio so for kilometers I need the
drive ratio to be 0.5.
As for the speedo itself I could mess around with strengthening or weakenin the permenant magnet in the drag cup but trying to reprint to kph seems
the easier option
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bajachris88
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| posted on May 16th, 2013 at 08:29 AM |
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| Quote: | Originally
posted by psimitar
Yea, I've been playing around with it and doing some calcs and for std Beetle tyre diameter your looking at 800 revolutions and as speedos are given
in respect to every 1000 revs then the 0.8 is this ratio. Basically the last worm and cog of the odometer sets the ratio so for kilometers I need the
drive ratio to be 0.5.
As for the speedo itself I could mess around with strengthening or weakenin the permenant magnet in the drag cup but trying to reprint to kph seems
the easier option
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G'day mate, if you find a mob that does the reprinting please let me know. I'm going to be changing tyre diameters soon and it will put the whole
scale out of whack 
(ô_!_/ô) (ô_!_/ô)
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DylanTheDubber
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| posted on May 16th, 2013 at 09:36 AM |
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I Can Re-Calibrate VW Speedos.
Im on the Gold Coast Now.
Let me know what wheels and tyres your running i can do the rest.
From Dylan
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psimitar
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| posted on May 16th, 2013 at 10:37 PM |
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| Quote: | Originally
posted by DylanTheDubber
I Can Re-Calibrate VW Speedos.
Im on the Gold Coast Now.
Let me know what wheels and tyres your running i can do the rest.
From Dylan
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So does this mean you reduce the magnetism to allow the drag drum to turn slower so that the MPH scale now works as a KPH scale?
And then you change the gears for the Odometer to work in kilometers too?
If so then how much does a re-cal cost roughly?
Ta,
Mike
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psimitar
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| posted on May 16th, 2013 at 10:42 PM |
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| Quote: | Originally
posted by bajachris88
G'day mate, if you find a mob that does the reprinting please let me know. I'm going to be changing tyre diameters soon and it will put the whole
scale out of whack
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Will do Looking into how hard it is to either screen print it meself or
get a stencil sticker made to re-spray the face.
For yours tho the Odometer will be out by the percentage increase in the tyres rolling radius but having the magnet within the drag drum strengthened
by a gauge recalibrators would mean the dial wouldn't need repainting
So gives you the option if you wish to recalibrate instead of re-painting the dial.
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matberry
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| posted on May 16th, 2013 at 11:24 PM |
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To change calibration, it's more usual to fit a gearbox into the cable, that way speedo and odometer stay in sync. Flex-drive Agencies used to do it,
I think they are still around.
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
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Joel
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| posted on May 17th, 2013 at 07:34 AM |
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| Quote: | Originally
posted by bajachris88
G'day mate, if you find a mob that does the reprinting please let me know. I'm going to be changing tyre diameters soon and it will put the whole
scale out of whack
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I'm not sure if Brent at Castlehill Gauges still does it but he made my new faces up.
They are plastic with opaque number like modern cars have so light up much better at night and he can alter the design,
I wanted that ring around the center gone on my new one and the odometer cut out as one not individual.
I'm sure changing the scale wouldn't be too hard.
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cb john
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| posted on May 17th, 2013 at 10:14 AM |
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I have plenty of those in different colours and for different gauges...all the other stickers as well...
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psimitar
Son of Jim - Creator of Good
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| posted on May 17th, 2013 at 02:06 PM |
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| Quote: | Originally
posted by matberry
To change calibration, it's more usual to fit a gearbox into the cable, that way speedo and odometer stay in sync. Flex-drive Agencies used to do it,
I think they are still around.
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Now that's an intriguing idea
if not then the stickers may work but at the same time I like the early style of speedo as it has 5 lines between each number whereas the later
speedos are just a plain black background with the numbers on it.
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68AutoBug
A.k.a.: Lee Noonan
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| posted on May 18th, 2013 at 01:50 PM |
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| Quote: | Originally
posted by psimitar
So got an old mph speedo to play with and wondering what the W0.8 stamped on the back means?
There is nothing to state how many revolutions per mile the speedo goes like an old Smiths gauge would so I'm wondering if this is the worm drive
ratio?
Fancy playing with making it a KPH speedo as it's easy enough to screen print the dial from MPH to KPH but the odometer is the trickier part.
Ta
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always wondered what that was... lol
easier to have a new sticker/face made...
Lee
- [size=4]Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY--- [/size]
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