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Jim, that hard loud POP POP POP POP is caused partly cuz rememebr, that may be a 250 to 500 cubic inch engine thats firing and exhaustign out the stack in a couple sudden discharges as opposed to say an 8 cyliner engine the same cubes with a closer series of lesser discharges spread out over 8 instead of just 2 cylinders. Theres that extremely longgggg ggggg stroke and all the cubes that explode then all that CFM of exhaust discharge that makes that unique sound versus that of multi 6 or 8 cylinder engines. By the way (according to JR and others), when your ears detect that POP POP POP POP, youre NOT hearing each individual cyliner firing (left right left right etc) your ear hears the combimation of BOTH expolsions and exhaust gas discharges,,,,, then the 540 degree coast cycle,,,,, ,then BOTH (only 180 apart) then the 540 coast,,,, then both etc etc etc. JR Hobbs explained that once somewhere, and if you do the math of the firings, and consider ear response times, and the short time between left then right fires (only 180 degrees) versus the lag of 540 between the next firing, it seems to make some sense????? Good Luck n God Bless John T
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