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6. Enter the Piston Speed for which you want to determine an RPM
limit, along with stroke of 3.48:
7. Calculate the RPM limit:
Calculating Engine Displacement
You could simply check the factory specs on the engine
displacement of your vehicle, but that number is usually a
rounded up or down number. If you are building an engine to your
specification, or modifying one and want to know the effects on
displacement by changing bore and/or stroke, the Hot Rod Calc
can do it.
In this example, your 1968 Pontiac GTO's Ram Air II engine has
a published engine displacement of 400 CID. The spec bore and
stroke are 4.12 inches and 3.75 inches, respectively. Calculate
the exact cubic-inch displacement. Your calculator defaults to 8
cylinders.
KEYSTROKES
1. Enter your Bore and Stroke:
2. Calculate the actual Engine Displacement:
FPM S 3500.
STROK S 3.48 IN
RPM 6034.483
BORE S 4.12 IN
STROKE S 3.75 IN
ENG SIZE 399.95 CU IN
ENG SIZE 6554.004 CC
ENG SIZE 6.554 L
CYL VOL 49.994 CU IN
H
R
C
OT
OD
ALC
DISPLAY
0.
™ — 51
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