Mazda rotary engine swap

(Difference between revisions)

Revision as of 04:03, 13 August 2009

The Mazda rotary engine is a good match for Datsun 1200 -- it is light and compact. It makes more power than a piston engine of the same size and weight. The engine weight is down low so it doesn't prevent good handling.

Performance

Typical engine power in stock form:

• 12A: 100-130 HP, 100-115 lb. ft. torque
• 13B EFI: 135 hp, 133 lb. ft. torque
• 13B-Turbo (1987-1991 "Turbo II"): 185-200 HP

Quarter Mile acceleration performance ranges from quick to insanely quick. With a totally stock rotary engine you won't be wanting for power.

• 16.1 at 90mph: bone stock 12a engine tuned by ear
• Ange's 13.7 second 12A bridgeport
• JVML's 8.1 second 13B twin turbo

Discussions

• Project: SUNNY COUPE GX (13B COSMO TURBO)
• Rota 1200
• Rotary 1200 Coupe, 6 Speed

Engine

The Mazda rotary comes in two common sizes: 12A and 13B. In Australia, choose a 12A for street legal swaps. Everyone else, choose the 13B. There are less common versions, the old 10A and the ultra-rare and expensive 20B triple rotor.

12A

Mazda 13B carbureted

13B Fuel Injected

Mazda 13B Turbo rotary engine

Factory EFI 13B Turbo

13B Turbo with factory intercooler

20B triple rotor

Engine Mounts

Motor Plate

For racing a motor plate can be used. Not recommended for a street car as it transmit vibration directly to the body.

Transmission

Transmission Mount

Tunnel

Some fabricate a large tunnel. Is it necessary, or just used with beefy racing transmissions?

Differential

• Will a H165 rear end handle a bridgeported 13b?

Photo Index