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Old 19-04-05, 07:33 PM   #9
Sid Squid
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That's a good, simple explanation of what reeds are, but it suggests that using reeds allows 'bigger' ports, this is not absolutely accurate.
A piston ported two stroke has to have quite conservative port timing so that the primary compression does not cause significant levels of blowback, this restricts the inlet duration and limits volumetric efficiency, particularly at low revs.
Using reed valves in the inlet tract allows more radical port timing, so to say that the ports will be bigger might be true, but it's more to do with their positioning.
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