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carsAll Mazdarotary enginerotary engines are essentially a single family - they all derive from the firstrotary engineexperiments in the early 1960s. Over the years, displacement has been increased (somewhat) , and turbocharging has been added to great effect. This is the engine family that madecarsMazdafamous.In auto racingand for Japanese tax purposes, the displacement ofrotary engineengines is defined as the equivalent of 1.5 times the nominal displacement. So the 1.3 L 13B engines count as just under 2.0 L for these purposes.
rotary engineengines can be classifiedcarsby their rotor size in terms of width (diameter) and depth (thickness) . These metrics function similarly to the bore and stroke measurements of a piston engine. Nearly allMazdaproductionrotary engineengines share a single rotor diameter: 105 mm (4.1 in) with a 15 mm (0.6 in) crankshaftcarsoffset. The only engine to diverge from this formula was the rare 13A, which used a 120 mm (4.7 in) diameter and 17.5 mm (0.7 in) offset.40A
Mazda's first prototyperotary enginewas the 40A, a single-rotor engine very much like the NSU KKM400. Although never producedcarsin volume, the 40A was a valuable testbed forMazdaengineers, and quickly demonstrated two serious challenges to the feasibility of the design: chatter marks in the housing and heavy oil consumption. The chatter marks, nicknamed devil's fingernails, were caused by improper sealing at the apex of the rotor. Thecarsoil consumption problem was addressed with heat-resistant rubber oil seals at the sides of the rotors. This early engine had a rotor diameter of 90 mm (3.5 in) , an offset of 14 mm (0.6 in) , and a depth of 59 mm (2.3 in) .L8A The carsvery firstMazdaCosmo prototype used a 798 cc L8A two-rotorrotary engine. The engine and car were both shown at the 1963 Tokyo Motor Show. Hollow cast iron apex seals reduced vibration and thus chatter marks. It used dry-sump lubrication. Rotor diameter was up from the 40A to 98carsmm (3.9 in) , but depth dropped to 56 mm (2.2 in) .One-, three-, and four-rotor derivatives of the L8A were also created for experimentation. 10A The 10A series was Mazda's first productionrotary engine, appearing in 1965. It was a two-rotor design, with each displacingcars491 cc for a total of 982 cc. These engine featured the mainstream rotor dimensions with a 60 mm (2.4 in) depth.The rotor housing was made of sand-cast aluminum plated with chrome, while the aluminum sides were sprayed with molten carbon steel for strength. Cast iron was used carsfor the rotors themselves, and their eccentric shafts were of expensive chrome-molybdenum steel. The addition of aluminum/carbon apex seals addressed the chatter mark problem.0810 The first 10A engine was the 0810, used in the Series I Cosmo from May, 1965 through July, 1968. These cars, and theircarsrevolutionary...To Read the Complete Article click Here . By: Jon beal |
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