![]() It would open at around 5750 rpm (at 7250 rpm for high-output engines). The variable intake valve is used to lengthen the intake manifold and for increased mid-range torque. The high-output engines have the auxiliary port which would open at about 6250 rpm. The secondary port starts operations at 3750 rpm after the shutter valve would open. ![]() The primary intake is used at low rpm only. That gave a high throttle responds, more power, and allows the engine to rev up to 8200 rpm.Īll 13B-MSP engines got Sequential Dynamic Intake System (S-DAIS) for controlling the secondary and auxiliary ports, and the variable intake valve. The engine equipped with lighter parts to reduce rotational mass: rotors are lighter by 14%, flywheel - by 20%. The cross-sectional area for the intake ports is an almost 30% larger compared to the 13B-REW engine. The standard versions have two intake ports per chamber, and high-output - three intake ports per chamber (primary, secondary and auxiliary). The 13B-MSP engine was offered in standard and high-output versions. The result is more stable and efficient combustion. Now the unburned gases are not carried in the next combustion cycle. ![]() That reduces gas flow resistance (almost the double the exhaust port area than of the 13B-REW), eliminates intake/exhaust overlap, and increases thermal efficiency, power, and fuel efficiency. The biggest improvement is the 13B-MSP has two exhaust ports per rotor in a side housing instead of one peripheral exhaust port for each chamber on the Mazda RX-7's engines. ![]() It kept two-rotor layout with a capacity of 1308 cc (79.81 cu in), the same rotor radius and length. Instead of the 13B-REW, the 13B-MSP is a naturally aspirated (NA) engine. ![]()
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