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7/27/2019 Auto Math Formulas - Automobile
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DATAfac. conversin = 2.54
pi = 3.1416pi/4 = 0.7854bore = 4.00 in
bore = 16stroke = 4.00 in
# of cylinders = 8displacement = 402.12 cubic inches
cm. cbicos =
FORMULAS cm. cbicos = (displacement*fac. con)*fac. con*fac. concylinder volume =
cylinder volume = 50.265 displacement =displacement = 402.12 displacement
stroke = 4bore = 4 displacement
cm. cbicos = 6590 (pi/4 x stroke x number of cylinders
DISPLACEMENT, STROKE & BORE
stroke =
bore =
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DATA1.0
pi/4 = 0.7853982cylinder =
chamber volume =cylinder volume =
stroke =compression ratio =
new disp. Ratio =old disp. Ratio =
FORMULAS cylinder + chamber volumechamber volume
compression ratio = #DIV/0! cylinder volume =cylinder volume = 0 cylinder volume
chamber volume = 0 compression ratio - 1.0displacement ratio = #DIV/0! cylinder volume
amount to mill = #DIV/0! chamber volumenew disp. Ratio - old disp. Rationew disp. Ratio x old disp. Ratio
COMPRESSION RATIO
x stroke
compression ratio =
chamber volume =
amount to mill =
displacement ratio =
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DATA6
stroke in inches =rpm =
piston speed in fpm =
FORMULASstroke in inches x rpm
piston speed in fpm = 0 6rpm = #DIV/0! piston speed in fpm x 6
stroke in inches
PISTON SPEED
piston speed in fpm =
rpm =
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DATA525210000.03
rpm =torque =
horsepower =fuel pounds per hour =
brake horsepower =elevation in feet =bhp at sea level =
FORMULAS
rpm x torquehorsepower = 0 5252
torque = #DIV/0! 5252 x horsepowerbrake specific fuel consumption = #DIV/0! rpm
bhp loss = 0 fuel pounds per hourbrake hrosepowerelevation in feet
1000bhp loss = x 0.03 x bhp at sea le
BRAKE HORSEPOWER & TORQUE
horsepower =
torque =
brake specific fuel consumption =
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DATA792,000
150.81002.5
mep =displacement =
rpm =hp =
torque =brake output =
indicated output =
cylinders = mep x displacement x rpm792,000
FORMULAS mep x displacement150.8
horsepower = 0 hp x 792,000torque = 0 displacement x rpm
mep = #DIV/0! torque x 150.8mep = #DIV/0! displacement
mechanical efficiency = #DIV/0! brake outputfriction output = 0 indicated output
taxable horsepower = 0 friction output = indicated output - brake output
2.5taxable horsepower =
x 100
INDICATED HORSWEPOWER & TORQUE
horsepower =
torque =
mep =
mep =
mechanical efficiency =
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DATA3456
100
0.851.1
rpm =displacement =
actual cfm =theoretical cfm =
FORMULAS rpm x displacement3456
theoretical cfm = 0 actual cfmvolumteric efficiency = #DIV/0! theoretical cfm
street carb cfm = 0 rpm x displacement
racing carb cfm = 0 3456rpm x displacement3456
AIR CAPACITY & VOLUMETRIC EFFICIENCY
theoretical cfm =
volumteric efficiency =
street carb cfm =
racing carb cfm =
x 100
x 0.85
x 1.1
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DATA100
weight on wheels =overall weight =
distance of cg from wheels =wheelbase =
weight =
FORMULASweight on wheels
percent of weight on wheels = #DIV/0! overall weightincreased weight on wheels = #DIV/0! distance of cg from wheels
wheelbase+ weight
WEIGHT DISTRIBUTION
percent of weight on wheels =
increased weight on wheels =
x 100
x weight( )
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DATA0.85
1.227flywheel torque =
first gear =final drive =
drive wheel torque =rolling radius =wheel thrust =
weight =cg height =
wheelbase =g =
radius =
wheel track =
FORMULAS drive wheel torque = flywheel torque x first gear x final drive x 0.85drive wheel torque
drive wheel torque = 0 rolling radiuswheel thrust = #DIV/0! wheel thrust
g = #DIV/0! weightweight transfer = #DIV/0! weight x cg height
lateral acceleration = #DIV/0! wheel baselateral weight transfer = #DIV/0! radius
centrifugal force = 0weight x cg height
wheel trackcentrigual force = weight x g
x g
x g
1.227 x
g FORCE & WEIGHT TRANSFER
wheel thrust =
g =
weight transfer =
lateral acceleration =
lateral weight transfer =
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DATAratio shift into =
ratio shift from =rpm before shift =flywheel torque =
transmission ratio =
FORMULAS
rpm after shift = #DIV/0! ratio shift intodriveshaft torque = 0 ratio shift from
driveshaft torque = flywheel torque x transmission ratio
SHIFT POINTS
rpm after shift = x rpm before shift
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DATA5.825
234340335
weight =hp =ET =
tire diameter =rpm =mph = 0
FORMULAS weighthp
ET = #DIV/0! weighthp = #DIV/0!
weight = 0 weight =mph = #DIV/0! #DIV/0! hp
hp = 0 weightweight = #DIV/0! hp = (mph / 234) x weight
overall gear ratio (man) = #DIV/0! weight = (234 / mph) x hpoverall gear ratio (auto) = #DIV/0! overall gear ratio = tire diameter rpm
(manual transmission) 340 mph mphoverall gear ratio = tire diameter rpm
(automatic transmission) 335 mph mph
QUARTER - MILE ET & MPH
x 5.825
x 234
x
x
ET =
hp =
mph =
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DATA 3600100
seconds per mile =dif btw actual & indicated speeds =
actual speed =odometer reading @ finish =odometer reading @ start =
dif btw actual & indicated distances =actual distance =
FORMULAS3600
actual mph = #DIV/0! seconds per milespeedo error % = #DIV/0! dif btw actual & indicated speeds
indicated distance = 0 actual speedodo error % = #DIV/0! indicated distance = odometer reading @ finish - odometer reading @ start
dif btw actual & indicated distancesactual distance
INSTRUMENT ERROR
actual mph =
speedo error % =
odo error % =
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DATA336
rpm =tire diameter =
gear ratio =mph = 0
FORMULAS rpm x tire diametergear ratio x 336
mph = #DIV/0! #DIV/0! mph x gear ratio x 336rpm = #DIV/0! tire diameter
gear ratio = #DIV/0! rpm x tire diametertire diameter = #DIV/0! mph x 336
mph x gear ratio x 336rpm
tire diameter =
MPH, RPM, GEARS & TIRES
mph =
rpm =
gear ratio =
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DATA2
2540section width =
aspect ratio =rim diameter =
old tire diameter =new tire diameter =
original ratio =indicated mph =
actual mph =
FORMULAS section width x aspect ratio2540
tire diameter = 0 old tire diametereffective ratio = #DIV/0! new tire diameter
equivalent ratio = #DIV/0! new tire diameteractual mph = #DIV/0! old tire diameter
indicated mph = #DIV/0! new tire diameterold tire diameterold tire diameter
new tire diameterx actual mph
tire diameter =
effective ratio =
equivalent ratio =
actual mph =
indicated mph =
TIRE SIZES & THEIR EFFECTS
2 x + rim diameter
x original ratio
x original ratio
x indicated mph
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DATA3600
miles = 0
gallons =miles per gallon =
hours =miles per hour =
seconds =miles
FORMULAS gallonsmiles = miles per gallon x gallons
miles per gallon = #DIV/0! milesmiles = 0 0 miles per gallon
gallons = #DIV/0! milesmiles per hour = #DIV/0! hours
miles = 0 0 miles = miles per hour x hourshours = #DIV/0! milesraceway miles per hour = #DIV/0! miles per hour
seconds= #DIV/0! miles x 3600seconds
miles x 3600miles per hour
hours =
raceway miles per hour =
seconds =
AVERAGE MPH & MPG
miles per gallon =
gallons =
miles per hour =
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DATA0.075
0.015ounces =
% alcohol =weight =hours =
FORMULA
(ounces x % alcohol x 0.075)weight
BLOOD ALCOHOL CONCENTRATION
- (hours x 0.015)BAC =BAC = #DIV/0!
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235 60 15
3.7326.10
9.2582.0037.47
GEAR GEAR RATIO RPM/10MPH10 20 30 40 50 60 70 80 90 100 110 120 130 140 150
1 3.12 1496 1496 2992 4489 5985 7481 8977 ####2 2.21 1059 1059 2118 3177 4237 5296 6355 7414 8473 9532 #### ####
3 1.47 707 707 1413 2120 2826 3533 4239 4946 5653 6359 7066 7772 8479 9185 9892 ####
4 1.00 480 480 961 1441 1921 2402 2882 3362 3843 4323 4803 5284 5764 6244 6725 7205
GEAR GEAR RATIO MPH/1000RPM
1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000 7500 8000 85001 3.12 6.68 10 13 17 20 23 27 30 33 37 40 43 47 50 53 57
2 2.21 9.44 14 19 24 28 33 38 42 47 52 57 61 66 71 76 80
3 1.47 14.15 21 28 35 42 50 57 64 71 78 85 92 99 106 113 120
4 1.00 20.82 31 42 52 62 73 83 94 104 115 125 135 146 156 167 177
NON HEAVY DUTY 4-SPEEDS HAD A 2.66 FIRST GEAR AND A 1.91 SECOND GEAR
TYRE SIZE
TYRE DIAMETER =
TYRE WIDTH =CIRCUMFERENCE =
REAR END RATIO
RPM AT MPH
MPH AT RPM
NUMBERS IN BLACK ARE INPUT PARAMETERS
OTHER NUMBERS ARE FIXED (RED) OR CALCULATED (BLUE)AND CANNOT BE CHANGED
SPEEDO PINION GEAR TEETH =
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295 50 15
3.7326.61
11.61
83.6108911136.75
GEAR GEAR RATIO RPM/10MPH
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150
1st 2.65 1247 1247 2493 3740 4986 6233 7479 8726
2nd 1.57 738 738 1475 2213 2951 3689 4426 5164 5902 6640 7377 8115
DRIVE 1.08 509 509 1018 1526 2035 2544 3053 3561 4070 4579 5088 5597 6105 6614 7123 7632
GEAR GEAR RATIO MPH/1000RPM
1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000 7500 8000 8500
1st 2.65 8.02 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68
2nd 1.57 13.55 20 27 34 41 47 54 61 68 75 81 88 95 102 108 115DRIVE 1.08 19.65 29 39 49 59 69 79 88 98 108 118 128 138 147 157 167
THE TRUE RATIOS IN THE AUTO TRANS ARE 2.45/1.45/AND 1:1.HOWEVER I HAVE ADDED 8% FOR TORQUE CONVERTER SLIPPAGE TO MAKE IT AS ACCURATE AS POSSIBLE.
MPH AT RPM
NUMBERS IN BLACK ARE INPUT PARAMETERS
OTHER NUMBERS ARE FIXED (RED) OR CALCULATED (BLUE)
AND SHOULD NOT BE CHANGEDCIRCUMFERENCE =
TYRE SIZE
TYRE DIAMETER =
TYRE WIDTH =
REAR END RATIO
SPEEDO PINION GEAR TEETH =
RPM AT MPH
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DATA1
100propulsor =
cambio tren fijo =cambio =
tren fijo =V =
FORMULA1
V = #DIV/0! (propulsor x cambio tren fijo) 100relacin = #DIV/0! tren fijo x cambio V
RELACIN CAJA DE TRANSMISIN
V =relacin =
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