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			A piston engine compression tester only shows the peak compression for one chamber. To measure rotary compression, you either need to use a rotary tester, which records all three pulses, or remove the valve thing from a piston engine tester so you can at least watch the needle and estimate all three pulses.
		 
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					Originally Posted by Benjamin Franklin
					
				 Those who would give up Essential Liberty to purchase a little Temporary Safety, deserve neither Liberty nor Safety. |  |