rotary 13b engine

rotary 13b engine

The experience needs the subsequent: (one)vehicle with an motor (1)OBD-II Scan Instrument (1)stock air consumption with a Mass Air Movement sensor (MAF) in stock trim -in accordance to the writer, a slight variance from factory stock, this kind of as getting rid of the display or repositioning the sensor will give the experiment small benefit- (1)stretch of private, protected, deserted street.

The moment you've acquired all these products the procedure is relatively painless. Attach the scan device to the car and make sure it can report the following points: Engine RPM, Intake Air Temperature & Air Movement. Utilizing the deserted stretch of private road, operate the motor vehicle from a reduced motor rpm (2500rpm) @ WOT to redline (or as far as you want your sample to go..) even though recording Intake Air Temperature (IAT), Motor Pace (RPM) & Consumption Mass Air Flow (IMAF).

When you have your data logged, re-study the experiment from the link offered and begin crunching figures! Its principle appears straight ahead: centered on the calculated theoretical volumetric air circulation for your motor (a Renesis in this case), and the info you logged, you can approximate the true VE of your certain motor. I will offer the formulas I used at the conclude of this report. For now, let's get a seem at this chart [http://www.myrotarycar.com/mazdarx8/images/13B.MSP.Volumetric.Performance.020...].

Theoretical Volumetric Air Movement was calculated assuming that a 13B MSP rotary engine has comparable displacement in 720º of crankshaft rotation as a 2.6 Liter, 4 stroke piston engine. Recognize how VE climbs as Engine Speed boosts, till it reaches 5500rpms. This is had been the engine is rated to make peak torque, consequently its safe and sound to believe that VE will peak at or close by 5500rpms. Moreover, you can securely suppose that Volumetric Effectiveness plotted towards motor pace will mimic the shape and characteristics of the torque curve produced by the motor.

Notice that the plotted VE is somewhat linear: commences @ 80% and climbs its way to a tad above 100%. If this experiment's outcomes could be validated and the parameters I employed had been correct, it would signify that the Renesis engine -on my vehicle at minimum- is in fact really successful for a normally aspirated inner combustion powerplant -VE definition above.

Calculating Volumetric Effectiveness (VE) for the Renesis (13B MSP) rotary motor:

We will use the adhering to values obtained during our info log:

Information:

Consumption Air Temperature (IAT) = 82ºF

Engine Velocity (RPM) = 8561rpm

AirFlow (MAF) = 27.3lb/moment

THEORETICAL AIRFLOW CALCULATION:

Method:

[(ED) x (rpm) x (VE)] / [(ES) x (C)] = TAF

Variables:

ED = Engine Displacement [in³]

rpm = Motor Velocity [RPMs]

VE = Volumetric Performance [%]

ES = Motor Stroke Coefficient [#]

Do = Conversion coefficient from in³ to ft³

TAF = Theoretical Air Movement [ft³]

Solving:

[(159.64in³) x (8561rpm) x (one)] / [(2) x (1728 in³/ft³)] = TAF

TAF = 395.42ft³

Values:

ED = two.6 Liters (1308cc x two) >> 159.64in³

rpm = I selected 8561rpm arbitrarily.

VE = Considering that this corresponds to Theoretical VE, we suppose VE = 100% (one)

ES = Since we simplify a 13B motor to a four stroke aide engine -as a result two.6L- we use a coefficient of two.

C = 1728in³/ft³

AIR DENSITY & TEMPERATURE CALCULATION:

Formulation:

[(t1) / (t2)] = [(d2) / (d1)]

Variables:

t1 = Temperature of air for a acknowledged density [ºR]

t2 = Temperature of the consumption air measured by the IAT sensor [ºR]

d1 = Density of air for a recognized temperature [lb/ft³]