Auto Math Formulas - Automobile

7/27/2019 Auto Math Formulas - Automobile

1/25

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 =


2/25


3/25


4/25

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 =


5/25

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 =


6/25

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 =


7/25


8/25

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 =


9/25

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


10/25

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( )


11/25


12/25

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 =


13/25

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


14/25

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 =


15/25

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 % =


16/25

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 =


17/25

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


18/25

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 =


19/25

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!


20/25

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 =


21/25


22/25

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


23/25


24/25

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 =


25/25

Documents

Auto Math Formulas - Automobile