**** 360 Piston Options ****

Here are the Keith Black options:

There are basically three options for the Keith Black pistons, all of which have the compression distance = 1.675", so I will back that into my compression height:

1.675 - 1.572 = .103"

.103" (12.819 in**2) = 1.32 in**3 (16.387 cc/in**3) = 21.6 cc

This will bring my area above the piston to:

34 - 21.6 = 12.4 cc

Just for kicks, I backed it into the compression to see what the baseline compression is for the Keith Black pistons:

69 + 12.4 +12.4 = 93.8 cc

This will bring the compression to:

(93.8 + 752)/93.8 = 845.8/93.8 = 9.0

So the baseline compression for the Keith Black pistons is 9.0:1, and you can just adjust by the increase in piston dome volume for the rest of the comparisons...

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When I narrowed down the options to only pistons with positive piston dome height, I got three options...

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Keith Black KB373-040

Piston dome = + 2.75 cc

So we take the 93.8 cc from the first calculations above and get:

93.8 - 2.75 = 91.05 cc

This brings the compression to:

(91.05 + 752)/91.05 = 843.05/91.05 = 9.26

View attachment KB373-040 B.jpg

http://www.summitracing.com/parts/uem-kb373-040/overview/make/plymouth

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The next option is the Keith Black 107:

Piston dome = + 5 cc

93.8 - 5 = 88.8 cc

This brings the compression to:

(88.8 + 752)/88.8 = 840.8/88.8 = 9.47

View attachment KB107-040 B.jpg

http://www.summitracing.com/parts/uem-kb107-040/overview/make/plymouth

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Now just for kicks, I wanted to check the Keith Black SKB232-040:

Piston Dome = + 18 cc

93.8 - 18 = 75.8 cc

This brings the compression to:

(75.8 + 752)/75.8 = 827.8/75.8 = 10.9

View attachment SKB232-040 B.jpg

http://www.summitracing.com/parts/uem-skb232-040/overview/make/plymouth