Theoretical Motor Perf Estimator by: Kurlon Motor - 56 mm x 49.6 mm x 4 cylinders - 488.66 cc / 29.92 ci Target CR - 11.5:1 Bore : Stroke Ratio - 1.13 : 1 Max RPM - 12290 RPM with a cast piston (4000' per min max) Max RPM - 18435 RPM with a forged piston (6000' per min max) Cam Data - Intake Valve Count - 2 - Valve Size - 22 mm - Intake Lift - 7.50 mm Suggested minimum intake valve lift - 5.50 mm [1] Suggested maximum intake valve lift - 8.80 mm [2] Simulating a 32 mm carb Motor Perf Estimation - Rear Wheel HP RPM | Mean | Mach | Mach | Intake | Carb | HP | CR | Piston | Index | With | Flow | Flow | | Adju. | Speed | [3] | Lift | dm/sec | dm/sec | [5] | HP | m/sec | | [4] | [6] | [6] | | [7] ------+--------+-------+-------+--------+--------+------+------- 3000 | 5.0 | 0.09 | 0.09 | 29.46 | 23.73 | 14.4 | 14.4 3500 | 5.8 | 0.10 | 0.10 | 34.37 | 27.69 | 16.8 | 16.8 4000 | 6.6 | 0.12 | 0.12 | 39.28 | 31.65 | 19.2 | 19.2 4500 | 7.4 | 0.13 | 0.13 | 44.19 | 35.60 | 21.6 | 21.6 5000 | 8.3 | 0.15 | 0.15 | 49.10 | 39.56 | 24.1 | 24.1 5500 | 9.1 | 0.16 | 0.16 | 54.01 | 43.51 | 26.5 | 26.5 6000 | 9.9 | 0.18 | 0.18 | 58.92 | 47.47 | 28.9 | 28.9 6500 | 10.7 | 0.19 | 0.19 | 63.83 | 51.42 | 31.3 | 31.3 7000 | 11.6 | 0.21 | 0.21 | 68.74 | 55.38 | 33.7 | 33.7 7500 | 12.4 | 0.22 | 0.22 | 73.65 | 59.34 | 36.1 | 36.1 8000 | 13.2 | 0.24 | 0.24 | 78.56 | 63.29 | 38.5 | 38.5 8500 | 14.1 | 0.25 | 0.25 | 83.47 | 67.25 | 40.9 | 40.9 9000 | 14.9 | 0.27 | 0.27 | 88.38 | 71.20 | 43.3 | 43.3 9500 | 15.7 | 0.28 | 0.28 | 93.29 | 75.16 | 45.7 | 45.7 10000 | 16.5 | 0.30 | 0.30 | 98.20 | 79.11 | 48.1 | 48.1 10500 | 17.4 | 0.31 | 0.31 | 103.11 | 83.07 | 50.5 | 50.5 11000 | 18.2 | 0.33 | 0.33 | 108.02 | 87.03 | 52.9 | 52.9 11500 | 19.0 | 0.34 | 0.34 | 112.93 | 90.98 | 55.3 | 55.3 12000 | 19.8 | 0.36 | 0.36 | 117.84 | 94.94 | 57.7 | 57.7 12500 | 20.7 | 0.37 | 0.37 | 122.75 | 98.89 | 60.1 | 60.1 13000 | 21.5 | 0.39 | 0.39 | 127.66 | 102.85 | 62.5 | 62.5 13500 | 22.3 | 0.40 | 0.40 | 132.57 | 106.80 | 64.9 | 64.9 14000 | 23.1 | 0.42 | 0.41 | 137.48 | 110.76 | 67.3 | 67.3 14500 | 24.0 | 0.43 | 0.43 | 142.39 | 114.72 | 69.8 | 69.8 15000 | 24.8 | 0.45 | 0.44 | 147.30 | 118.67 | 72.2 | 72.2 15500 | 25.6 | 0.46 | 0.46 | 152.21 | 122.63 | 74.6 | 74.6 16000 | 26.5 | 0.48 | 0.47 | 157.12 | 126.58 | 77.0 | 77.0 16500 | 27.3 | 0.49 | 0.49 | 162.03 | 130.54 | 79.4 | 79.4 17000 | 28.1 | 0.51 | 0.50 | 166.94 | 134.49 | 81.8 | 81.8 17500 | 28.9 | 0.52 | 0.52 | 171.85 | 138.45 | 84.2 | 84.2 18000 | 29.8 | 0.54 | 0.53 | 176.76 | 142.41 | 86.6 | 86.6