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All mx5 uk Mazdarotary enginerotary engines are essentially a single family - they all derive from the firstrotary engineexperiments in the early 1960smazda mx5, mx5 uk, mx5 wanted, newmazda mx5, new mazda mx-5, new mx5 miataOver the years, displacement has been increased (somewhat) mx5 uk , and turbocharging has been added to great effect mazda mx5, mx5 uk, mx5 wanted, newmazda mx5, new mazda mx-5, new mx5 miataThis is the engine family that made Mazdafamousmazda mx5, mx5 uk, mx5 wanted, newmazda mx5, new mazda mx-5, new mx5 miata
In auto racingand for Japanese tax purposes, the displacement of rotary mx5 uk engine engines is defined as the equivalent of 1.5 times the nominal displacementmazda mx5, mx5 uk, mx5 wanted, newmazda mx5, new mazda mx-5, new mx5 miataSo the 1.3 L 13B engines count as just under 2.0 L for these purposes mazda mx5, mx5 uk, mx5 wanted, newmazda mx5, new mazda mx-5, new mx5 miata
rotary enginemx5 uk engines can be classified by their rotor size in terms of width (diameter) and depth (thickness)mazda mx5, mx5 uk, mx5 wanted, newmazda mx5, new mazda mx-5, new mx5 miataThese metrics function similarly to the bore and stroke measurements of a piston engine mazda mx5, mx5 uk, mx5 wanted, newmazda mx5, new mazda mx-5, new mx5 miatamx5 uk Nearly all Mazdaproductionrotary engineengines share a single rotor diameter: 105 mm (4.1 in) with a 15 mm (0.6 in) crankshaft offsetmazda mx5, mx5 uk, mx5 wanted, newmazda mx5, new mazda mx-5, new mx5 miataThe only engine to diverge from this formula mx5 uk was the rare 13A, which used a 120 mm (4.7 in) diameter and 17.5 mm (0.7 in) offset mazda mx5, mx5 uk, mx5 wanted, newmazda mx5, new mazda mx-5, new mx5 miata
40A
Mazda's first prototyperotary enginewas the 40A, a single-rotor engine mx5 uk very much like the NSU KKM400mazda mx5, mx5 uk, mx5 wanted, newmazda mx5, new mazda mx-5, new mx5 miataAlthough never produced in volume, the 40A was a valuable testbed for Mazdaengineers, and quickly demonstrated two serious challenges to the feasibility of the design: mx5 uk chatter marks in the housing and heavy oil consumptionmazda mx5, mx5 uk, mx5 wanted, newmazda mx5, new mazda mx-5, new mx5 miataThe chatter marks, nicknamed devil's fingernails, were caused by improper sealing at the apex of the rotor mazda mx5, mx5 uk, mx5 wanted, newmazda mx5, new mazda mx-5, new mx5 miataThe oil consumption problem was mx5 uk addressed with heat-resistant rubber oil seals at the sides of the rotors mazda mx5, mx5 uk, mx5 wanted, newmazda mx5, new mazda mx-5, new mx5 miataThis early engine had a rotor diameter of 90 mm (3.5 in) , an offset of 14 mm (0.6 in) mx5 uk , and a depth of 59 mm (2.3 in) mazda mx5, mx5 uk, mx5 wanted, newmazda mx5, new mazda mx-5, new mx5 miata
L8A The very first MazdaCosmo prototype used a 798 cc L8A two-rotorrotary enginemazda mx5, mx5 uk, mx5 wanted, newmazda mx5, new mazda mx-5, new mx5 miataThe engine and car mx5 uk were both shown at the 1963 Tokyo Motor Show mazda mx5, mx5 uk, mx5 wanted, newmazda mx5, new mazda mx-5, new mx5 miataHollow cast iron apex seals reduced vibration and thus chatter marks mazda mx5, mx5 uk, mx5 wanted, newmazda mx5, new mazda mx-5, new mx5 miataIt used dry-sump lubrication mazda mx5, mx5 uk, mx5 wanted, newmazda mx5, new mazda mx-5, new mx5 miataRotor diameter was up from the mx5 uk 40A to 98 mm (3.9 in) , but depth dropped to 56 mm (2.2 in) mazda mx5, mx5 uk, mx5 wanted, newmazda mx5, new mazda mx-5, new mx5 miata
One-, three-, and four-rotor derivatives of the L8A were also created for experimentation mazda mx5, mx5 uk, mx5 wanted, newmazda mx5, new mazda mx-5, new mx5 miata
mx5 uk 10A The 10A series was Mazda's first productionrotary engine, appearing in 1965mazda mx5, mx5 uk, mx5 wanted, newmazda mx5, new mazda mx-5, new mx5 miataIt was a two-rotor design, with each displacing 491 cc for a total of 982 cc mazda mx5, mx5 uk, mx5 wanted, newmazda mx5, new mazda mx-5, new mx5 miataThese mx5 uk engine featured the mainstream rotor dimensions with a 60 mm (2.4 in) depth mazda mx5, mx5 uk, mx5 wanted, newmazda mx5, new mazda mx-5, new mx5 miata
The rotor housing was made of sand-cast aluminum plated with chrome, while the aluminum sides were sprayed with mx5 uk molten carbon steel for strength mazda mx5, mx5 uk, mx5 wanted, newmazda mx5, new mazda mx-5, new mx5 miataCast iron was used for the rotors themselves, and their eccentric shafts were of expensive chrome-molybdenum steel mazda mx5, mx5 uk, mx5 wanted, newmazda mx5, new mazda mx-5, new mx5 miataThe addition of aluminum/carbon apex seals addressed the chatter mx5 uk mark problem mazda mx5, mx5 uk, mx5 wanted, newmazda mx5, new mazda mx-5, new mx5 miata
0810 The first 10A engine was the 0810, used in the Series I Cosmo from May, 1965 through July, 1968 mazda mx5, mx5 uk, mx5 wanted, newmazda mx5, new mazda mx-5, new mx5 miataThese cars, and their revolutionary engine, were mx5 uk often called L10A modelsmazda mx5, mx5 uk, mx5 wanted, newmazda mx5, new mazda mx-5, new mx5 miataGross output was 110 hp (82 kW) at 7000 RPM and 130 Nm (96 ft.lbf) at 3500 RPM, but both numbers were probably optimistic mazda mx5, mx5 uk, mx5 wanted, newmazda mx5, new mazda mx-5, new mx5 miata
The 10A mx5 uk featured twin side intake ports per rotor, each fed by a one of four carburetor barrels mazda mx5, mx5 uk, mx5 wanted, newmazda mx5, new mazda mx-5, new mx5 miataOnly one port per rotor was used under low loads for added fuel economy mazda mx5, mx5 uk, mx5 wanted, newmazda mx5, new mazda mx-5, new mx5 miataA mx5 uk 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 mazda mx5, mx5 uk, mx5 wanted, newmazda mx5, new mazda mx-5, new mx5 miataA bit of oil was mx5 uk mixed with the intake charge for lubrication mazda mx5, mx5 uk, mx5 wanted, newmazda mx5, new mazda mx-5, new mx5 miata
The 0810 was modified for the racing Cosmos used at Nürburgring mazda mx5, mx5 uk, mx5 wanted, newmazda mx5, new mazda mx-5, new mx5 miataThese engines had both side- and peripheral-located intake ports switched with a mx5 uk butterfly valve for low- and high-RPM use (respectively) mazda mx5, mx5 uk, mx5 wanted, newmazda mx5, new mazda mx-5, new mx5 miataBy: Jon beal |
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