calculator

Engine CI                           Maxium RPM
----------------------        X      --------------------------           = CARB. CFM
   2                                         1728

Valvetrain
Valve Spring Retainers
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7 Degree Retainers
10 Degree Retainers
Solid Roller Lifters
Pop Up Lifters
Vertical Bar Lifters
Chevy Lifters
Ford Lifters
Mopar Lifters
Pontiac Lifters
Olds Lifters

For easer use.

Engine CID   x    Maxium RPM
------------------------------------------------------------    = Carb. CFM
                     3456

How to figure valve-open duration from cam card.

BTDC + ABDC + 180 = Number of Degrees (Duration)

Intake
Ported Intake
Intake Machining
Intake Spacer
Carburetor Spacer
Intake Insert
Intake "Turtle"

180 is the degrees of a full intake stroke
Formula can figure Exhaust also ATDC + BBDC + 180 = Duration

How to figure pressure ratio for boost.

14.7 + Boost
PR = ------------------------------
14.7

EFI
ECM/PCM
Reprogramming

LT1 ECM/PCM
Reprogramming

LT4 ECM/PCM
Reprogramming

LS1 ECM/PCM
Reprogramming

OBD II Reprogramming

Example for 5 psi of boost
           14.7 + 5 (psi)
PR = --------------------------- = 1.34
                   14.7
1.34 is 34% more air going into the engine
Example #2 for 12 psi of boost
           14.7 + 12
PR = --------------------------- = 1.82
                  14.7
That 82% more air going into the engine

Transmission s
GM Transmissions
200-R4
700-R4
TH 350
TH 375
TH 400
4L80E

Ford Transmissions
AOD
AODE
4EOD
C4
C6
Torqushift
Dodge Transmissions
47RH
47RE
48RE
Torquflit

Transmission Parts

How to figure Air Flow Rate.

CID x RPM x 0.5 x EV
Air Flow Rate = ----------------------------------------------
1728

Example of a 302 Mustang
302 x 5500 x 0.5 x 0.85
Air Flow Rate = ------------------------------------ = 408 CFM
1728

How to figure Air Filter Flow Lost

Standard Barometric Pressure
Air Filter Flow Loss = ----------------------------------------------------------------------- -1 = ?
Standard Barometric Pressure - Loss through filter

Classifieds
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Clearance Items
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Used Parts
New Parts
Track Adhesive

Gauge reads 3 inches of vacum under maxium load.

30
Air Filter Flow Loss = ------------------------------------ -1 = 11% Loss
30 - 3

How to convert cc/min to lb/hr.

Cubic Centimeters                     Pounds
---------------------------      =     ---------------- X 10.5
Minute                                     Hour

How to calculate injector size for a given application.

Expected BHP X 0.55
Pounds of Fuel Per Hour Per Injector = ------------------------------------------
Number of Injectors

How to figure Duty Cycle.

Stock Pulse Duration
Duty Cycle = --------------------------------
Time of one Revolution

Example :
5.0 msec
Duty Cycle = ------------------ = 0.67 = 67%
7.5 msec

How to figure Performance Gain.

                                            Desired Horsepower
       Performance Gain = ---------------------------------- -1 = ?
                                           Original Horsepower

Example :
                 275 + 100
           ----------------------- -1 = 0.36 =36%
                      275

How figure Horsepower.

Horsepower = Torque x RPM
-------------------------
5252

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