I have recreated a curious inline 7 with BMW M52B28 sourced parameters.
Based on @WilliamMoser "Perfect fourth" hypothetical inline 7 engine audiovisual demonstration.
Firing order is 1-3-6-4-7-2-5 with two exhaust manifolds 1+2+6+7 and 3+4+5.
1,2,6,7 (firing at 180º intervals) and 3,4,5 (firing at 240º intervals).
#inline7 #straight7 #engine #sound #bmw

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