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 Post subject: Mazda Rx-4 (1973-1976?)
PostPosted: Sat May 07, 2011 4:02 am 
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Location: Adelaide S.A
The information provided in this thread may not be accurate or complete. This thread will be under construction permanently, so please reply or send me a PM if you have anything to add.

Production & Sale
The Rx-4 was released onto the Australian market for sale in early 1973 (around February) with the 12A engine twin dizzy rotary with the chassis prefix LA22S until 73/9, then the updated 13B engine chassis prefix LA23S was released 73/10 and the REAPS (Rotary Engine Anti Pollution System) was introduced from 74/4 to try and beat the harding emission rules and the now becoming fuel crisis. Although there are earlier examples on the road as cars were imported for testing and readying for sale before the actual "on sale date". They were sold until February in 1978.

Many other rolling upgrades had been done to the body like the introduction of the "Series 3" (merc front) from 75/10

Body Styles
For Australian delivery, the Rx-4 was available in four door sedan and two door fastback (hardtop) styled coupe body styles only. Both seated five, though it's arguable whether or not they seated five comfortably. Japan and various other export markets received the Rx-4 in a wagon version too

There are 3 distinct body styles in the Rx-4 range

Series 1 Rx-4
Image
The "flat nose" front was only used on the sedan from first production 73/2 up until the introduction of the 13b engine 73/9

Series 2 Rx-4
Image
The "pointy nose" was use on the hardtop from first production 73/2 up until 75/9. This production also used the cockpit dash from car 1 from the hardtop but introduced it to the sedan and wagon in 73/10 until end of production

Series 3 Rx-4
Image
The "Merc front" as known to many was introduced from 75/10 until the end sale of the Rx-4 which had a re-vamp of the front and back end rap-around bumped with rubber inserts, change of grill and tail lights

Engine
12A Engine Twin dizzy (unsure if Australia got them in the single dizzy form)
Displacement: 573cc (35.0 cu-in)x 2 rotors

13B Engine
Displacement: 654cc (40.0 cu-in)x 2 rotors

13B Engine REAPS (Rotary Engine Anti Pollution System)
Displacement: 654cc (40.0 cu-in)x 2 rotors

Driveline
4-Speed Manual (12A twin dizzy Australia) (as well as U.S.A &Canada)
Gear Ratios:
1st -3.683
2nd - 2.263
3rd - 1.397
4th - 1.000
Reverse 3.692
Oil capacity: 1.7 liters

4-Speed Manual 13B (Australia)
Gear Ratios:
1st -3.380
2nd - 2.077
3rd - 1.390
4th - 1.000
Reverse 3.389
Oil capacity: 1.7 liters

5-Speed Manual
Gear Ratios:
1st -3.683
2nd - 2.263
3rd - 1.397
4th - 1.000
5th - 0.862
Reverse 3.692
Oil capacity: 2.2 liters

Automatic
3-speed jatco automatic optional (sedan only) (and it think id did become a option for the hardtop but unsure of the date)
Gear Ratios:
1st - 2.458
2nd - 1.458
3rd - 1.00
Reverse - 2.182
Fluid capacity: 6.2 liters

TQX 5 speed
13B Gear Ratios
1st - 3.380
2nd - 2.077
3rd - 1.390
4th - 1.000
5th - 0.862
Rev - 3.389
Fluid capacity: ?

The TQX 5-speed which was fitted in australia and also fitted to the RX-4 in other markets, shares the same 1st to 4th gear ratio's as the 4-speed (as well as the 0.862 5th gear from memory), AND, also features a Park position to the left of 1st gear which locks the gearbox from turning, as with the fluid coupling fitted the engine has no "park brake" effect like when you leave a normal manual transmission in gear

Differential
-13B diff, 28 spine axles
Final drive ratio: 3.900
Oil capacity: 1.2 liters

-12A diff, 24 spline axles
Final drive ratio: 3.900
Oil capacity: 1.4 liters

Pictures of the differences in diff centers of the rx4 12A and 13B diff carrier/ center
ok the crown wheel bolt spacing is different see pics

this is a 13b diff center and a 12a gear set sitting together
Image

Image

12a long nose diff carries and open Hampshire center on the left and 13b shot nose carrier and not the closed hemashire center
Image


Wheels: Steel 5.5"J x 13
Tires:
Australia: Front 175 HR-13 Radial, Rear 195/70 HR-13 Radial
Great Britain: 195/70 HR-13 Radial, Rear 195/70 HR-13 Radial
Other: 175 SR-13 Radial, Rear 195 SR-13 Radial


Dimensions
Hardtop
Overall Length: 4,320mm (170in)
Overall Width: 1,665mm (66in)
Overall Height: 1,380mm (54in)
Wheelbase: 2,510mm (99in)
Track - Front: 1,380mm (54in)
Rear: 1,370 (54in)
Minimum road clearance : 175mm (7in)
Minimum turning radius: 5m (16.5ft)
Seating capacity : 5
Curb Weight 12A model : 1,050kg (2,315lb)
Curb weight 13B model : 1,085kg ?

Sedan
Overall Length: 4,240mm (167in)
Overall Width: 1,660mm (65in)
Overall Height: 1,410mm (56in)
Wheelbase: 2,510mm (99in)
Track - Front: 1,380mm (54in)
Rear: 1,370 (54in)
Minimum road clearance : 175mm (7in)
Minimum turning radius: 5m (16.5ft)
Seating capacity : 5
Curb Weight 12A model : 1,045kg (2,305lb) Automatic:1,055kg (2,325lb)
Curb Weight 13B model : 1,180kg (2,601lb)? Automatic:1,190kg (2,623lb)?

Wagon (info taken from a U.S.A spec catalog)
Overall Length: 4,648mm (183in)
Overall Width: 1,660mm (65in)
Overall Height: 1,410mm (56in)
Wheelbase: 2,510mm (99in)
Track - Front: 1,380mm (54in)
Rear: 1,370 (54in)
Minimum road clearance : 175mm (7in)
Minimum turning radius: 5m (16.5ft)
Seating capacity : 5
Curb Weight 13B model : 1,315kg (2,930lb)

*Weights given here are for the 12A equipped models (Update the 13B weights but may not be 100% correct). This information was taken from a Japanese brochure, and may vary slightly from the Australian delivered cars. Please PM me your information from an Australian brochure.


Body Checking
Image

Image

Chassis reference
In the Australian market the Rx4 had 2 different chassis prefixes LA22S was used on the 12A sedans and hardtops, the chassis prefixes LA23S was used on the 13B sedans and hardtops. in the Japan market they also got the wagon as a rotary vehicle with the chassis prefixes LA22W

Noted the chassis prefixes on the 929 were LA2VS sedans and hardtops. Chassis prefixes used on Wagons was LA2VV

Due to the quality of the scan i have uploaded it in 1024x765 format so that people can save them and see correctly once zoomed in
Image
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Image

A sale add from a reader digest
Image

The success Car
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Updated 5/1/2013


thanks to circle_w3rk who has already scanned and uploaded and hosted the rx4 workshop manual here: http://www.ausrotary.com/viewtopic.php?f=4&t=112921 for the last 7 years at least for all to down load as needed
Update 30/6/16

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Last edited by Fat 4 RE on Thu Jun 30, 2016 9:18 pm, edited 3 times in total.

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 Post subject: Re: Mazda Rx-4 (1973-1976?)
PostPosted: Sat May 07, 2011 8:31 am 
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The 13B model was available from 10/73 approx


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 Post subject: Re: Mazda Rx-4 (1973-1976?)
PostPosted: Sat May 07, 2011 9:41 am 
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Good to see some real RX-4 stuff being put together =D>

Are we going to try to keep this thread Australia Specific in general, with maybe overseas information included but clearly marked? I find it annoying sometimes when overseas specs creep into these things and the actual Au specs get polluted. Food for thought anyway.

Gear ratios for the 4-speed 13B model are different from those ones listed which are 12A Twin Dizzy ratios, at least in Australia.

13B Gear Ratios
1st - 3.380
2nd - 2.077
3rd - 1.390
4th - 1.000
Rev - 3.389

As an aside, the TQX 5-speed which was also fitted to the RX-4 in other markets, shares the same 1st to 4th gear ratio's as the above 4-speed (as well as the 0.862 5th gear from memory), AND, also features a Park position to the left of 1st gear which locks the gearbox from turning, as with the fluid coupling fitted the engine has no "park brake" effect like when you leave a normal manual transmission in gear.

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 Post subject: Re: Mazda Rx-4 (1973-1976?)
PostPosted: Sat May 07, 2011 10:18 am 
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Joined: Tue May 20, 2008 12:38 am
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Thanks guys been thinking about doing this for a while as there is not information in one place for the Rx-4

All the information is collected from 3 different work shop manuals ranging from 73-75 ( including supplements for the 13b REAPS ) 2 Rx4 parts books vol1 and 2 some US/Jap spec brochure + other info i have collected on my travels in rebuilding my Rx-4

Dazz i do show that the gears ratios you listed are correct (i just did not check the 3rd 75 Mazda supplement) iwill update my first post soon to reflect this and may add the TQX box info to

What do you think about the Aust spec info?? i think you right and all oversees info can and will be highlighted and clearly marked


If anyone has valid information to add please PM me so i can keep this as relevant as i can and up to date

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 Post subject: Re: Mazda Rx-4 (1973-1976?)
PostPosted: Sat May 07, 2011 10:59 am 
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rotary lover wrote:
The 13B model was available from 10/73 approx

This is Australia spec.Better to leave other countries out.


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 Post subject: Re: Mazda Rx-4 (1973-1976?)
PostPosted: Sat May 07, 2011 11:11 am 
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Really good thread...


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 Post subject: Re: Mazda Rx-4 (1973-1976?)
PostPosted: Sat May 07, 2011 12:09 pm 
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Location: Adelaide S.A
rotary lover wrote:
rotary lover wrote:
The 13B model was available from 10/73 approx

This is Australia spec.Better to leave other countries out.


What may be a idea is to add a second section for other country's as some of the info is valid is the big scheme of things

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 Post subject: Re: Mazda Rx-4 (1973-1976?)
PostPosted: Sat May 07, 2011 1:48 pm 
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I just have to say those adds are amazing! I love seeing old stuff like that of how things once were!


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 Post subject: Re: Mazda Rx-4 (1973-1976?)
PostPosted: Sat May 07, 2011 3:36 pm 
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Location: Goulburn NSW
This is long overdue!

If we only started getting RX-4's from February (2/73) and the LA23's came in from October (10/73), that leaves me a bit confused. The date my compliance plate is either 1/73 or 10/73 and the chassis prefix is LA22S. it's very hard to make out, it was covered in paint and hard to accurately make out the date. I've gotten most of the paint off but the date is still hard to see properly.

Maybe this is one of the earlier cars you mentioned. Unless the later 73 cars still had the LA22S prefix. :? I could PM you the whole chassis number, that might help clear things up a bit.


Keith :wink:

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 Post subject: Re: Mazda Rx-4 (1973-1976?)
PostPosted: Sat May 07, 2011 4:10 pm 
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Keith don,t worry about compliance date.Where I live there is a 1 owner 12A RX4 coupe dated 11/73.My mechanic here also has a 1 owner RX4 sedan 12A.When he purchased the car new 13B model was already available.


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 Post subject: Re: Mazda Rx-4 (1973-1976?)
PostPosted: Sat May 07, 2011 6:34 pm 
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Keith don't worrie at all mate as the 12A LA22S was produced up until 75/10 and still could of been ordered from Mazda if you check the chassis number listing i posted, and i think they were produced for other markets other then Australia but still could of been shipped after the change over date as excess stock

More of a rule of thumb is the 74/4 date where the REAPS was released as they were only on the 13b motors in the Rx-4

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 Post subject: Re: Mazda Rx-4 (1973-1976?)
PostPosted: Sat May 07, 2011 6:54 pm 
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Just had a look at the list, my chassis number starts with 151, on the list that's August (8/73). Looks like someone's "altered" the date on my compliance plate.


Keith :wink:

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 Post subject: Re: Mazda Rx-4 (1973-1976?)
PostPosted: Sat May 07, 2011 7:26 pm 
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keithrx3c@hotmail.com wrote:
Just had a look at the list, my chassis number starts with 151, on the list that's August (8/73). Looks like someone's "altered" the date on my compliance plate.


Keith :wink:



In my experience, dont forget the compliance date will be different from the build date. I just checked my 12A RX-4s and one of them is an october compliance date.

I'm not sure when the compliacne plate is fitted, but it must be either when leaving Japan, or when arriving in Australia. On most newer cars (Toyota etc.) they usually have a build plate and compliance plate, and generally the only ones with the month the same is Aussie built, I have seen a Hyundai I tghink with about 6 months between the built date and the compliance date.

By the numbers mine is also a 8/73 build and 10/73 compliance. My last 3 digits are 191

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 Post subject: Re: Mazda Rx-4 (1973-1976?)
PostPosted: Sat May 07, 2011 10:58 pm 
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good show boys keep it up love the read

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 Post subject: Re: Mazda Rx-4 (1973-1976?)
PostPosted: Sun May 08, 2011 1:51 pm 
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Keith, compliance plates were fitted in Australia, when the car was inspected after arrival and approved as meeting Australian compliance conditions. I'm not sure where this happened, perhaps when the cars were still on the docks, perhaps in Mazda's holding yard, or maybe even at the dealership before sale, Dennis can you shed some light here? It bears no relationship to the build date. Cars unloaded off a ship, first ones off mean first into the yard, last ones to be complied, up to several months from the build date in Japan.

Australia received no 12A Single Dizzy cars to my knowledge. It was 13B only from the introduction of REAPS, although as you correctly note Japan and some export markets got the 12A single dizzy motors in both REAPS equipped and dirty versions, depending on the country's emissions regs. Keith's car will be a 12A twin dizzy, complied when they got around to it.

Interesting to see those brochure pictures show a "Rotary" badge on the front grille for series 1 cars, when we all know that these cars actually got the RE12 badge front and rear, and then series 2 cars changed to the "Rotary Engine" badges. More proof that restorers shouldn't use brochures as final evidence of factory specs, pictures from Australian road tests in contemporary magazines are a much better source. That said, I will point to the tail light positioning of the indicators inboard an tail / brakes outboard on the coupes as evidence that most Aussies put these together the wrong way around.

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