Reed valve
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Member
PX 125/Polini 177
Joined: 07 Jun 2019
Posts: 22
Location: Gloucester UK
Sat Jun 08, 2019 4:10 pm quote
Anyone know anything about reed valve on a Vespa, looks a bit of a job to fit. Is it basically there to make a bigger bore carb work? Are the gains in performance, if any, worth the trouble and cost? Any thoughts?
Veni, Vidi, Posti
74 Super, 75 Super, PX project, LML off-roader and new to 2018, '66 Blue Badge Smallframe
Joined: 30 Nov 2011
Posts: 7006
Location: Victoria, Australia
Wed Jun 12, 2019 11:48 pm quote
A few reasons. LML did it to reduce fuel consumption and (presumably) avoid the extra maching process of the rotary pad. Plenty of people use one when the rotary pad is beyond repair. The larger ones can create a bigger intake than is possible with the rotary pad. They can also help with increasing crankcase volume and lowering crankcase pressure which can be beneficial. If you want to use a side draft carb, most of the manifolds available are for reed rather than for rotary. Also it allows the potential for greater flow downstream of the reed itself with flow around the crank rather than through the webs.
Member
PX 125/Polini 177
Joined: 07 Jun 2019
Posts: 22
Location: Gloucester UK
Thu Jun 13, 2019 12:38 am quote
Reed valve.
Thanks for the response Ginch. I think Ill leave my setup as is, not sure Id get any benefit without other work...
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