Speedometer

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Category: Body Electrical System

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Revision as of 00:24, 6 May 2014 ddgonzal (Talk | contribs) (->Speedometer Calibration) <- Previous diff		Revision as of 00:31, 6 May 2014 ddgonzal (Talk | contribs) (->Speedometer Calibration) Next diff ->
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	See [[Speedometers Calibration]]		See [[Speedometers Calibration]]
		+
		+	= Amplifier Speed Switch =
		+	USA model from 0772 use an amplifier speed switch for [[Throttle Opener]] system.
		+	<br>25035-H7000 ASSY-AMPLIFIER SPEED SWITCH
		+	<br>[http://datsun1200.com/modules/myalbum/photo.php?lid=23062 http://datsun1200.com/modules/myalbum/photos/thumbs/23062.jpg]
		+
		+	Australia models also used it, dates unknown.
		+	<br>[http://datsun1200.com/modules/myalbum/photo.php?lid=13695 http://datsun1200.com/modules/myalbum/photos/thumbs/13695.jpg] [http://datsun1200.com/modules/myalbum/photo.php?lid=11981 http://datsun1200.com/modules/myalbum/photos/thumbs/11981.jpg]
		+
		+	68800-AM7200 speed sensor
		+	<br>[http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%20Misc/20090615145339DSC07168x.jpg http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%20Misc/th_20090615145339DSC07168x.jpg]
		+
		+	Datsun 620 pickup USA also uses it for [[BCDD]] system:
		+	<br>[http://i297.photobucket.com/albums/mm219/ddgonzal/forum/620_speedometer_c.jpg http://i297.photobucket.com/albums/mm219/ddgonzal/forum/th_620_speedometer_c.jpg] [http://i297.photobucket.com/albums/mm219/ddgonzal/forum/620_cluster_back.jpg http://i297.photobucket.com/albums/mm219/ddgonzal/forum/th_620_cluster_back.jpg]
		+	<br>620 clusters with [[Speedometer#Amplifier_Speed_Switch|Amplifier Speed Switch]] attached to back of speedometer
		+
		+	25035-H7000 ASSY-AMPLIFIER,SPEED SWITCH $69 USD
		+	* Datsun 1200 1973 USA
		+	* Datsun 620 1972 USA MT
		+	25035-B6401 $88 USD
		+	* Datsun 620 1974 USA MT
		+	25035-B8000 $70 USD
		+	* Datsun 620 1975-1979 USA MT
	= Custom Faces =		= Custom Faces =

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Revision as of 00:31, 6 May 2014

Speedometers were either in kilometers (JDM) or miles (USA). Australia started with mph and then switched to kph. Some speedometers had a trip meter.

Contents [hide] 1 Overview 2 Variations 2.1 Part Numbers 3 Metric-Imperial Conversion 4 Speedometer Calibration 5 Amplifier Speed Switch 6 Custom Faces 7 Speedometer Cable 8 Drive Ratios 8.1 Part Numbers 8.1.1 56 & 60 Series 8.1.2 Automatic Transmission 8.1.3 63-Series 8.2 Application 8.2.1 56 & 60 Series 8.2.2 FS5W63A 8.3 Pinion or Assembly 8.4 Ratio Adapter Box 9 Photo Index

Overview

Comparo

1972 USA Owners manual (see page 8,9 for Speedometer): Instrument and Controls

Variations

•  ?? 100MPH w/o tripmeter (US standard equipment)

  

•  ?? 100MPH with tripmeter

  

• 24850-H3400 1200 120MPH SPEEDOMETER Includes tripmeter

  

• Facelift GX - 180 kph

  

Part Numbers

USA

• 24850-H1816 ASSY-SPEEDOMETER 100MILE/H
• 24850-H7000 ASSY-SPEEDOMETER 100MILE/H From 7/72 [With 10 mph markings]

JDM Sunny Truck

• 24850-B8600 SPEEDOMETER ASSY -7803 [Rectangle]
• 24850-G1670 SPEEDOMETER ASSY 7804- [Round]

Metric-Imperial Conversion

Sometimes on eBay Australia you can get the vintage conversion stickers.

OR

Take the face plate and scan it on the flatbad scanner, then modify it. Finally, print a new one out with the photo printer. You can modify the font, colors, etc. Bolt it to the speedo using the standard screws.

Speedometer Calibration

It is normal for the speedometer to read fast. The specified tolerance is +5% -10%. So at actual 60mph it can read 57 to 66 and still be acceptable.

But you can blueprint the speedometer to be closer to the actual speed.

See Speedometers Calibration

Amplifier Speed Switch

USA model from 0772 use an amplifier speed switch for Throttle Opener system.
25035-H7000 ASSY-AMPLIFIER SPEED SWITCH

Australia models also used it, dates unknown.

68800-AM7200 speed sensor

Datsun 620 pickup USA also uses it for BCDD system:

620 clusters with Amplifier Speed Switch attached to back of speedometer

25035-H7000 ASSY-AMPLIFIER,SPEED SWITCH $69 USD
* Datsun 1200 1973 USA
* Datsun 620 1972 USA MT
25035-B6401 $88 USD
* Datsun 620 1974 USA MT
25035-B8000 $70 USD
* Datsun 620 1975-1979 USA MT

Custom Faces

See Custom Dash Faces

280Z speedometer fits:

1. Swap the mounting cups as the 280Z unit is deeper
2. Drill a hole for the trip meter shaft through the back
3. The face is to large for the opening in the 1200 housing, so carefully reduce the diameter by 1/8 inch

Speedometer Cable

See main article: Speedometer Cable

Drive Ratios

Stock 1200 Speedometer gear ratio:

• pinion teeth/worm teeth on trans output shaft
• 17/5 (3.90 diff)
• 18/5 for Wagon or Ute (4.11 diff)

To adjust the speedometer for different diameter tires, change the transmission cable pinion cog.

* If speedo reads too fast, fit a bigger cog
* If speedo reads too slow, fit a smaller cog

Given that stock is a 17 tooth pinion, moving to one more or less tooth is about 6% change. So by changing the pinion you can only get it to ±3 mph accurate. For example, at 100 mph, within 3 mph. Or at the standard 50 mph rating, a reading between 1½ mph (48½ to 51½) is the best you can hope for. For finer tuning the speedometer itself needs calibration. Or you could fit different diameter rear tires.

EXAMPLE: If you are reading say 60 when you are really going 50 then the speedo cable needs to slow down by about 20% to read more accurately. If the speedo drive has a 17 tooth cog in it try to find a cog that reduces by 20%. 17 X .20 = 3.4 teeth... 17 + 3.4 = 20.4 teeth, the closest is a 20 tooth cog.

Teeth	% change	50 mph reading
16	106.25%	53.1
17	100.00%	50.0
18	94.44%	47.2
19	89.47%	44.7

Correction Table, increase Teeth by:

Actual mph	Desired mph	Tooth
40	50	3+
43	50	2+
47	50	1+
50	50	0+

Estimated Tire Correction Table (for 3.9 diff)

Size	Diameter	Difference	Pinion	~Error
165/55R12	19.1	88%	19T	0%
165/60R12	19.8	91%	18T	-2%
165/70R12	21.1	97%	17T	3%
155/80R12	21.8	100%	17T	0%
175/70R13	22.6	104%	16T	2%
195/50R15	22.7	104%	16T	2%
165/70R14	23.1	106%	16T	0%
205/45R17	23.5	108%	16T	-2%
185/60R15	23.7	109%	16T/15T	3%
205/40R18	24.5	112%	15T	0%

Part Numbers

• NOTE: while they are color-coded, order by part number, not by color. For example, 63-series and 56-series cogs (pinion gears) use different color coding.
• They are easy to replace by removing the roll pin...use your original Cog Body (Sleeve).

56 & 60 Series

56-Series Transmission and 60-Series Transmission

• PINION (32703)
• 32703-18001 PINION ASSY-SPEEDOMETER (15T)
• 32703-18000 PINION ASSY-SPEEDOMETER (16T) $10.55 USD
• 32703-15400 PINION SPEEDOMETER 17T [White] $17.02 USD
• 32703-H1000 PINION SPEEDOMETER 18T [Blue] $15.67 USD

• SLEEVE W/PINION ASS'Y (3702)
• 32702-15400 ASSY-PINION SPEEDOMETER 17T $17.02 USD
• 32702-H1000 ASSY-PINION SPEEDOMETER 18T (B120, 1975-1979)
• 32702-H1001 ASSY-PINION SPEEDOMETER 19T (B120, 1980 up)

Automatic Transmission

• 32703-P2616 PINION SPEEDOMETER 16T (auto) $23.22 USD
• 32703-P2617 PINION SPEEDOMETER 17T (auto) $12.78 USD
• 32703-P2618 PINION SPEEDOMETER 18T (auto) $23.43 USD
• 32703-P2619 PINION SPEEDOMETER 19T (auto) $12.78 USD
• 32703-P2620 PINION SPEEDOMETER 20T (auto) $12.83 USD
• 32703-P2621 PINION SPEEDOMETER 21T (auto) $21.12 USD

• 32702-P2719 ASSY-PINION SPEEDOMETER 19T (auto) $30.80 USD

63-Series

• 32703-N9016 PINION SPEEDOMETER 16T $13.28 USD
• 32703-N9017 PINION SPEEDOMETER 17T $12.42 USD
• 32703-N9018 PINION SPEEDOMETER 18T $12.42 USD
• 32703-N9019 PINION SPEEDOMETER 19T $11.80 USD

Application

56 & 60 Series

• B110 with 3.90: 17T
• B110 with 4.11: 18T
• B210 with A13: 17T
• B210 with A13: 18T (optional Sedan)
• B210 with A14: 17T to 0376
• B210 with A14: 16T from 0476
• B310 with A12 North America: 17T
• B310 with A14/A15: 16T

FS5W63A

NOTE: 63 5-speed and 4-speed pinion gears have a different part numbers, so perhaps do not interchange.

• 32703-N9016 16T
  • JDM A10 F5
  • USA B210 F5

• 32703-N9017 17T
  • USA S10 1977-1979
  • USA D21 2WD F5
  • USA GC22 1987-1989 Nissan Van [RS5W71C]

• 32703-N9018 18T
  • USA D21 F4 1988-1989
  • USA D21 2WD F5 1986-1992 SELECT

• 32703-N9019 19T
  • USA D21 2WD F5 1986-1992 SELECT

Pinion or Assembly

Each drive gear (on the output shaft of the transmission) works with a variety of different pinion gears.

For the A-series gearboxes, there is only one size of drive gear, which works with 16-19 teeth pinions. The sleeves are all the same, so all you need is the gear (not the assembly).

Different transmission have different methods:

Jeep - offset holder is rotated to various positions for each gear
GM TH350 - two drive gears, each works with a range of driven gears
720 - all have 6T drive gear
56-series, 60, driven gear is machined on the shaft
4W63, 71B, 71C replaceable gear

Ratio Adapter Box

http://www.speedscreen.com.au/clarkbros.html

Photo Index