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All sports car Mazdarotary enginerotary engines are essentially a single family - they all derive from the firstrotary engineexperiments in the early 1960sproduct reviews, sports car, sportscars, sports utility vehicle, supercarsOver the years, displacement has been increased (somewhat) sports car , and turbocharging has been added to great effect product reviews, sports car, sportscars, sports utility vehicle, supercarsThis is the engine family that made Mazdafamousproduct reviews, sports car, sportscars, sports utility vehicle, supercars
In auto racingand for Japanese tax purposes, the displacement of rotary sports car engine engines is defined as the equivalent of 1.5 times the nominal displacementproduct reviews, sports car, sportscars, sports utility vehicle, supercarsSo the 1.3 L 13B engines count as just under 2.0 L for these purposes product reviews, sports car, sportscars, sports utility vehicle, supercars
rotary enginesports car engines can be classified by their rotor size in terms of width (diameter) and depth (thickness)product reviews, sports car, sportscars, sports utility vehicle, supercarsThese metrics function similarly to the bore and stroke measurements of a piston engine product reviews, sports car, sportscars, sports utility vehicle, supercarssports car Nearly all Mazdaproductionrotary engineengines share a single rotor diameter: 105 mm (4.1 in) with a 15 mm (0.6 in) crankshaft offsetproduct reviews, sports car, sportscars, sports utility vehicle, supercarsThe only engine to diverge from this formula sports car was the rare 13A, which used a 120 mm (4.7 in) diameter and 17.5 mm (0.7 in) offset product reviews, sports car, sportscars, sports utility vehicle, supercars
40A
Mazda's first prototyperotary enginewas the 40A, a single-rotor engine sports car very much like the NSU KKM400product reviews, sports car, sportscars, sports utility vehicle, supercarsAlthough never produced in volume, the 40A was a valuable testbed for Mazdaengineers, and quickly demonstrated two serious challenges to the feasibility of the design: sports car chatter marks in the housing and heavy oil consumptionproduct reviews, sports car, sportscars, sports utility vehicle, supercarsThe chatter marks, nicknamed devil's fingernails, were caused by improper sealing at the apex of the rotor product reviews, sports car, sportscars, sports utility vehicle, supercarsThe oil consumption problem was sports car addressed with heat-resistant rubber oil seals at the sides of the rotors product reviews, sports car, sportscars, sports utility vehicle, supercarsThis early engine had a rotor diameter of 90 mm (3.5 in) , an offset of 14 mm (0.6 in) sports car , and a depth of 59 mm (2.3 in) product reviews, sports car, sportscars, sports utility vehicle, supercars
L8A The very first MazdaCosmo prototype used a 798 cc L8A two-rotorrotary engineproduct reviews, sports car, sportscars, sports utility vehicle, supercarsThe engine and car sports car were both shown at the 1963 Tokyo Motor Show product reviews, sports car, sportscars, sports utility vehicle, supercarsHollow cast iron apex seals reduced vibration and thus chatter marks product reviews, sports car, sportscars, sports utility vehicle, supercarsIt used dry-sump lubrication product reviews, sports car, sportscars, sports utility vehicle, supercarsRotor diameter was up from the sports car 40A to 98 mm (3.9 in) , but depth dropped to 56 mm (2.2 in) product reviews, sports car, sportscars, sports utility vehicle, supercars
One-, three-, and four-rotor derivatives of the L8A were also created for experimentation product reviews, sports car, sportscars, sports utility vehicle, supercars
sports car 10A The 10A series was Mazda's first productionrotary engine, appearing in 1965product reviews, sports car, sportscars, sports utility vehicle, supercarsIt was a two-rotor design, with each displacing 491 cc for a total of 982 cc product reviews, sports car, sportscars, sports utility vehicle, supercarsThese sports car engine featured the mainstream rotor dimensions with a 60 mm (2.4 in) depth product reviews, sports car, sportscars, sports utility vehicle, supercars
The rotor housing was made of sand-cast aluminum plated with chrome, while the aluminum sides were sprayed with sports car molten carbon steel for strength product reviews, sports car, sportscars, sports utility vehicle, supercarsCast iron was used for the rotors themselves, and their eccentric shafts were of expensive chrome-molybdenum steel product reviews, sports car, sportscars, sports utility vehicle, supercarsThe addition of aluminum/carbon apex seals addressed the chatter sports car mark problem product reviews, sports car, sportscars, sports utility vehicle, supercars
0810 The first 10A engine was the 0810, used in the Series I Cosmo from May, 1965 through July, 1968 product reviews, sports car, sportscars, sports utility vehicle, supercarsThese cars, and their revolutionary engine, were sports car often called L10A modelsproduct reviews, sports car, sportscars, sports utility vehicle, supercarsGross output was 110 hp (82 kW) at 7000 RPM and 130 Nm (96 ft.lbf) at 3500 RPM, but both numbers were probably optimistic product reviews, sports car, sportscars, sports utility vehicle, supercars
The 10A sports car featured twin side intake ports per rotor, each fed by a one of four carburetor barrels product reviews, sports car, sportscars, sports utility vehicle, supercarsOnly one port per rotor was used under low loads for added fuel economy product reviews, sports car, sportscars, sports utility vehicle, supercarsA sports car single peripheral exhaust port routed hot gas through the coolest parts of the housing, and engine coolant flowed axially rather than the radial flow used by NSU product reviews, sports car, sportscars, sports utility vehicle, supercarsA bit of oil was sports car mixed with the intake charge for lubrication product reviews, sports car, sportscars, sports utility vehicle, supercars
The 0810 was modified for the racing Cosmos used at Nürburgring product reviews, sports car, sportscars, sports utility vehicle, supercarsThese engines had both side- and peripheral-located intake ports switched with a sports car butterfly valve for low- and high-RPM use (respectively) product reviews, sports car, sportscars, sports utility vehicle, supercarsBy: Jon beal |
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