Its length and width I believe.
Here is one of my favorite pages of the rotary eng. ill. web site:
http://www.rotaryengineillustrated.c...-ports101.html
This has helped me alot with understanding these concepts.
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'89 RX7 GTU, half-Bridge-port S4/S5 NA, E6K, Full RB exhaust, weekend warrior.
'83 RX7, The "this might take awhile" project.
'87 RX7 GXL, Rest In Pieces.
'98 Subaru Impreza Outback-sport, rx7 rescue vehicle, down for repair.
'94 Ford Ranger, daily.
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