Mr. Gasket 8703 Hot Rod Calculator - Manual (Page 53)

U
ser
'
s
G
Uide — 51
1. Enter the values from the example:

bore 4.
in

sTroK 3.48
in

(Gskt Bore)
G-bor 4.1
in

(Gskt Thickness)
G-THK 0.038
in

(Deck Height)
deCK 0.015
in

(Dome Vol)
doMe
Vol
4.5
CC

(Chamber Vol)
CHMbr
Vol
76.
CC
2. Calculate the Compression Ratio:
 *
CoMP
raTio
8.805**
* Repeated presses of  will toggle through the inputs and outputs,
starting with the entered Bore.
— do noT Clear CalCUlaTor —
** The calculated Compression Ratio is about 8.81:1. At this point, if you
were not satisfied with this ratio, you can use your Hot Rod Calc to play
out some other scenarios.
For this example, to raise your Compression Ratio, you could en-
ter a thinner Head Gasket Thickness of 0.015. All the other inputs
are stored in your calculator.
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3. Change the Gasket Thickness by entering 0.015 inches:

(Gskt Thickness)
G-THK 0.015
in
4. Re-calculate the Compression Ratio:

CoMP
raTio
9.253
Notice the increase in the calculated Compression Ratio. In summary,
lowering the overall Chamber Volume will increase the Compression
Ratio, whereas raising the overall Chamber Volume will decrease the
Compression Ratio. Piston Dome, Deck Height, and Head Gasket
Thickness are several ways to effect your Compression Ratio. In the
next section, you can read about one of the more popular ways to in-
crease Compression Ratio, which is a process known as milling.
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