PRH wrote: ↑Sat Nov 27, 2021 11:07 am
My experience has been that cams with faster ramps, and the resulting additional area within the overlap triangle, idle “rougher”.
This is why Blair looks at overlap area in 4 different segments intake area ivo to evc, intake area ivo to tdc, exhaust area ivo to evc, and exhaust tdc to evc
Stan
_______I__N__T__A__K__E
Rocker_Arm_Ratio_=_1.650_________Valve_Lash_=_0.02100
Intake_BTDC_(IVO_to_TDC)_=_4.559
Intake_Pumping_(TDC_to_BDC)_=_106.103
Intake_Ramming_(BDC_to_IVC)_=_15.992
Intake_Overlap_(IVO_to_EVC)_=_25.558
VALVE_____Lift______Opens___Closes__Duration
_________________Deg_BTDC__Deg_ABDC_____________Area
_________0.00000____47.69_|__84.37_|_312.05_|__61.01
_________0.00600____44.55_|__80.80_|_305.35_|__60.99
_________0.01000____42.73_|__78.67_|_301.39_|__60.98
_________0.02000____38.71_|__73.99_|_292.70_|__60.91
_________0.04000____32.32_|__66.84_|_279.16_|__60.69
_________0.05000____29.68_|__63.94_|_273.61_|__60.56
_________0.10000____18.96_|__52.59_|_251.56_|__59.70
_________0.15000____10.52_|__43.84_|_234.35_|__58.68
_________0.20000_____3.06_|__36.19_|_219.26_|__57.27
_________0.25000____-3.97_|__29.07_|_205.10_|__55.41
_________0.30000___-10.85_|__22.20_|_191.36_|__53.71
_________0.35000___-17.79_|__15.20_|_177.41_|__51.04
_________0.40000___-24.96_|___7.98_|_163.03_|__48.74
_________0.45000___-32.52_|___0.38_|_147.86_|__45.30
_________0.50000___-40.80_|__-7.88_|_131.31_|__41.46
_________0.55000___-50.19_|_-17.26_|_112.55_|__36.16
_________0.60000___-61.45_|_-28.50_|__90.05_|__29.76
_________0.65000___-76.72_|_-43.55_|__59.73_|__20.32
CAM
_________0.00600____56.01_|__92.95_|_328.96_|__39.04
_________0.01000____50.50_|__87.43_|_317.93_|__39.00
_________0.02000____41.86_|__77.65_|_299.51_|__38.83
_________0.04000____30.98_|__65.35_|_276.33_|__38.48
_________0.05000____26.89_|__60.95_|_267.84_|__38.29
_________0.10000____11.47_|__44.82_|_236.29_|__37.07
_________0.15000____-0.70_|__32.36_|_211.67_|__35.53
_________0.20000___-12.08_|__20.95_|_188.87_|__33.37
_________0.25000___-23.72_|___9.23_|_165.51_|__30.83
_________0.30000___-36.39_|__-3.48_|_140.13_|__27.21
_________0.35000___-51.53_|_-18.59_|_109.88_|__22.27
_________0.40000___-72.76_|_-39.65_|__67.59_|__14.31
_______E__X__H__A__U__S__T
Rocker_Arm_Ratio_=_1.650_________Valve_Lash_=_0.02100
Exhaust_Blow-Down_(EVO_to_BDC)_=_14.529
Exhaust_Pumping_(BDC_to_TDC)_=_82.863
Exhaust_ATDC_(TDC_to_EVC)_=_3.255
Exhaust_Overlap_(IVO_to_EVC)_=_16.929
VALVE_____Lift______Opens___Closes__Duration
_________________Deg_BBDC__Deg_ATDC_____________Area
_________0.00000____84.89_|__52.45_|_317.34_|__61.20
_________0.00600____81.92_|__48.12_|_310.04_|__61.19
_________0.01000____80.15_|__45.63_|_305.78_|__61.17
_________0.02000____76.28_|__40.48_|_296.77_|__61.08
_________0.04000____70.06_|__32.70_|_282.75_|__60.84
_________0.05000____67.42_|__29.60_|_277.03_|__60.75
_________0.10000____56.59_|__17.84_|_254.43_|__59.92
_________0.15000____47.85_|___8.73_|_236.59_|__58.63
_________0.20000____40.15_|___0.74_|_220.88_|__57.16
_________0.25000____32.89_|__-6.74_|_206.15_|__55.52
_________0.30000____25.81_|_-13.90_|_191.91_|__53.56
_________0.35000____18.78_|_-21.09_|_177.69_|__51.22
_________0.40000____11.49_|_-28.44_|_163.05_|__48.58
_________0.45000_____3.78_|_-36.17_|_147.61_|__45.14
_________0.50000____-4.64_|_-44.58_|_130.78_|__40.80
_________0.55000___-14.18_|_-54.15_|_111.67_|__36.02
_________0.60000___-25.51_|_-65.58_|__88.91_|__29.06
_________0.65000___-41.10_|_-81.03_|__57.87_|__19.59
CAM
_________0.00600____92.42_|__62.66_|_335.08_|__39.20
_________0.01000____87.53_|__56.19_|_323.71_|__39.15
_________0.02000____79.33_|__44.51_|_303.84_|__39.00
_________0.04000____68.70_|__31.10_|_279.80_|__38.62
_________0.05000____64.62_|__26.50_|_271.12_|__38.44
_________0.10000____48.83_|___9.75_|_238.58_|__37.24
_________0.15000____36.27_|__-3.28_|_212.99_|__35.45
_________0.20000____24.55_|_-15.19_|_189.36_|__33.47
_________0.25000____12.76_|_-27.17_|_165.58_|__30.73
_________0.30000____-0.15_|_-40.11_|_139.74_|__27.12
_________0.35000___-15.52_|_-55.51_|_108.97_|__21.84
_________0.40000___-37.00_|_-77.00_|__65.99_|__13.86