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Video Japan 1
Video Japan 2
Video Japan 3
Video Japan 4

Video Mazda
Video History (short)
Video History

Video 2015 MX5
Video 2015 CX-3
Video 2014 Mazda 2
Video 2014 25 years MX5
Video 2013 Mazda 3
Video 2012 Mazda 6
Video 2012 CX 5
Video 2010 Mazda 2
Video 2005 MX 5
Video 2003 RX 8
Video 2003 Mazda 3
Video 1992 RX 7 Turbo
Video 1989 MX 5
Video 1978 RX 7
Video 1972 RX 4

Video Rotary piston engine

          A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Mazda RX 7

Mazda RX 7
EngineRotary piston with two chambers
Displacement2 x 573 cm³
Performance77/85/83 kW (105/115/113 PS)
at 6000 rpm
Compression ratio9,4 : 1
Mixture preparationDual-downdraft carburetor
Coolant systemPump circulation, 9,5 liter
Torque144/146 Nm at 4.000 rpm
TypeFront engine with rear drive
Wheelbase2.420 mm
Turning circle9.600 mm
Suspension frontMcPherson
Suspension rearRigid axle, coil springs
Brakes frontDiscs, internally ventilated
Brakes rearDrums, discs (since 1980)
Tyres185/70 R 13 (5,5")
Length4.285 mm
Width1.675 mm
Height1.260 mm
Tank capacity55 liter
Top speedApprox. 190/200 km/h
Kerb weight1.045 kg + driver
Purchase priceApprox. 22.000 DM
Period of construction1978 - 1985
Electrics12 V/ 60 Ah

The Americans were obviously crazy about the car in its time. As Mazda could not deliver enough, prices rose on the black market about the original price. The sales reached higher levels than any other rotary car. It also storied as a rotary classic after the Ro 80, despite or because it is not noticed by its design and other technology.

One accuses it to be modeled after the Porsche 924. But with a development time then of at least five years, the two years difference in appearance time probably are too short. Also, the glass in the rear divided into three parts, what has probably a positive effect on production costs.

Whether it would have fitted under the flat running front hood a conventional engine? If so, then a horizontally opposed engine or moved very farrear. But on transaxle design the RX 7 needs not to avoid. It has the compact rotary engine under the hood and Americans are crazy about it. There also the oil price crisis from 1973 can not change much. The sales numbers for the previous rotary are indeed subsided by 30%, but with the new RX 7 again rising.

In Europe the car has less chances. On the one hand, because its technique e.g. with a rigid rear axle and its performance still are not quite like the Porsche 924 and, of course, because one does not trust the engine after Ro80-disaster. In addition, the Japanese must accept import quotas and the regulate them on price. I.e. the truck is here in view of the competition too expensive. And if it would be bought nevertheless, it would be even more expensive.               Top of page               Index
2001-2015 Copyright programs, texts, animations, pictures: H. Huppertz - E-Mail
Translator: Don Leslie - Email:

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