OK so what happens

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So what happens if I take all the emissions and exhaust system off except the large manifold that actually is attached to the engine. Then replace the carb w/ a regular one w/o any electrics and then put a regular exhaust attached to the manifold? Gas, Air, Compression, Spark, Boom. I've seen aircraft rotary engines that do not have any of the stuff ours do so what gives? It seems like all the extra stuff is for emission control. Any thoughts? I once took the FI off an Audi Quattro and put a Weber on the manifold top sealing off the throttle body opening. It ran really well. Thanks Doug 1980 RX7 in Cottage Grove Oregon.