Calculating bore and stroke – Calculated Industries 8703 User Manual
Page 55
H
OT
R
OD
C
ALC
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Repeated presses of
will toggle through the inputs and
outputs, starting with the entered Bore.
Calculating Bore and Stroke
Building from one of the previous examples, you want to push
your cubic inch displacement to a maximum of 405 CID to be
competitive at your local club races as well as meet class engine
requirements. Recall that the stock bore and stroke on the 1968
Ram Air II engine is 4.12 and 3.75 inches, respectively. Keeping
the stock Stroke length, calculate a new Bore size.
First, clear the memory on your calculator, including temporary and
semi-permanent entries.
KEYSTROKES DISPLAY
ALL CLEArEd
1. Enter the target displacement of 405 CID and current Stroke
length:
ENG S SIZE 405 CU IN
STROKE S 3.75 IN
2. Calculate the new Bore:
BORE 4.146 IN
In order to be within your class requirements, you could go to an
over-bored size of 4.146 inches.
3. Next, go the other way. Keeping your stock Bore, solve for a
longer Stroke length. Enter your stock Bore of 4.12 inches, and a
target displacement of 405 CID.
0.
BORE S 4.12 IN
ENG S SIZE 405 CU IN