Posted by Steve@Advance on January 13, 2017 at 21:51:54 from (107.203.134.67):
In Reply to: distinctive sound posted by flying belgian on January 13, 2017 at 20:20:24:
When comparing engines of similar size and purpose, namely 4 cylinder gas tractor engines...
I would say the basic sounds are determined buy the shape of the exhaust ports and the exhaust manifold that are common to each engine family.
Then each basic design is influenced by the individual choice of the muffler, or lack of muffler, length and size of the exhaust pipe, and over or under exhaust system.
Also valve timing, valve lash, ignition timing, fuel mixture, and engine load have an effect.
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