Gearing, what's it mean?

**Tank** · 19th June 2014, 08:18 AM

Originally Posted by 4x4 MORE

Land-Rover Series l (80in model) Produced 1948 to 1951
Engine: 4-cyl, 69.5 x 105mm, 1,595cc, CR 6.8:1, Solex Carb. 50bhp (net) at 4,000rpm. Maximum torque 80lb ft at 2,000rpm.

Transmission: Permanent four-wheel-drive with free-wheel in front drive. Front and rear differentials. High and low range of gears. Axle ratios 4.7:1. High range step down ratio 1.148:1: overall gear ratio 5.396, 8.039, 11.023, 16.165, reverse 13.743:1. low range step-down ratio 2.89: overall ratios 13.578, 20.229, 27.738, 40.676 reverse 34.581:1. Synchromesh on top and third gears.

Suspension and Brakes: Live front axle, half elliptic leaf springs, telescopic dampers, live rear axle, half elliptic leaf springs, telescopic dampers. Worm and nut steering 10 by 1 and a half inch front and rear drum brakes. 6.0 -16in or 7.00 - 16in tyres.

Dimensions: Wheelbase 6ft 8in (80in); front and rear tracks 4ft 2in, Length 11ft 6in; width 5ft 1in, height (hood up) 5ft 10.5in. Unladen weight 2,594lb Max payload 1,000l

Have a look at this Jeep, I don't understand the gearing?

http://files.asme.org/ASMEORG/Commun...marks/5578.pdf

I thought that they were Part-Time 4WD, Regards Frank.

**460cixy** · 19th June 2014, 08:31 AM

Originally Posted by Tank

I thought that they were Part-Time 4WD, Regards Frank.

The first of them had a crude full time arrangement

**JDNSW** · 19th June 2014, 05:11 PM

Originally Posted by Aaron IIA

Except the Lucas 12V generator is smaller than the Autolite 6V generator.
Aaron

Is it? I think the Jeep had a 15A 6v (90W) generator and the Landrover 12v 10A (120W).

John

**JDNSW** · 19th June 2014, 05:17 PM

Originally Posted by 460cixy

The first of them had a crude full time arrangement

I think it is actually quite elegant!

John

**4x4 MORE** · 19th June 2014, 08:52 PM

I would Love a willys Jeep myself!

**Aaron IIA** · 20th June 2014, 08:24 AM

Originally Posted by JDNSW

Is it? I think the Jeep had a 15A 6v (90W) generator and the Landrover 12v 10A (120W).

John

I thought that part of the discussion was talking about where the difference in weight comes from. The Jeep generator is physically larger and heavier than the Landrover generator.
The Lucas C39 as fitted to SI and SII Landrovers is nominal 12V 19A and the Lucas C40 as fitted to SIIa Landrovers is nominal 12V 22A. The Autolite generator as fitted to WWII Jeeps is nominal 6V 40A. The Autolite 6V regulator has two large cutout contacts to handle the extra current. Electrical capacity would then be close enough between the two to be considered the same.
Aaron

**JDNSW** · 20th June 2014, 09:10 AM

Originally Posted by Aaron IIA

I thought that part of the discussion was talking about where the difference in weight comes from. The Jeep generator is physically larger and heavier than the Landrover generator.
The Lucas C39 as fitted to SI and SII Landrovers is nominal 12V 19A and the Lucas C40 as fitted to SIIa Landrovers is nominal 12V 22A. The Autolite generator as fitted to WWII Jeeps is nominal 6V 40A. The Autolite 6V regulator has two large cutout contacts to handle the extra current. Electrical capacity would then be close enough between the two to be considered the same.
Aaron

You are probably right - but the 12v battery is much heavier than the 6v one (not double, agreed). But much of the higher weight comes from the stronger chassis (the Jeep relies on body for part of its strength, making a tailgate unfeasible).

John

**4x4 MORE** · 29th June 2014, 01:27 PM

The question was, what does the diff ratio and Transfer Ratio numbers mean?

**goingbush** · 29th June 2014, 02:08 PM

Originally Posted by JDNSW

I think it is actually quite elegant!

John

Elegant yes, but no 4WD in reverse . the freewheel isn't lockable.

Originally Posted by 4x4 MORE

The question was, what does the diff ratio and Transfer Ratio numbers mean?

A 4.7 diff ratio means the Propellor shaft turns 4.7 times for the Axle to turn once.

extrapolate same answer to your transfer case, except you have a high and low ratio

The overall low gear Ratio is the Diff ratio x !st gear ratio x low transfer gear ratio
which in the case of your Series one is 40.676 which means the Engine turns 40.676 revolutions for one turn on the axle

**4x4 MORE** · 29th June 2014, 06:45 PM

Ahh ok..

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