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Post by stepthrutuner on Mar 4, 2010 11:31:41 GMT -5
Lately I've been wondering about the best design for reed stops in high performance applications. In particular I've been wondering if, where or what sort of holes or slots should be placed in them to lessen the effect of 'air damping' as the reed comes against and leaves contact with the stop. I notice that the stock ones for my Piaggio motor are solid with no slots and seem to remember slots being in those on my Top Performance cage setup. One would certainly think that high frequency performance would be enhanced with holes/slots also careful placement of slots such as in the area in the middle between where the individual reeds come to rest against the stops would assist air flow out of the cage. Of course the air dampening effect would also cushion impact, lengthen reed life and lessen the 'bouncing' of reed against the stops. I haven't been able to find any info of this subject and just thought I would throw it out there for discussion or whatever.
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Post by 90GTVert on Mar 4, 2010 14:19:06 GMT -5
Some info I found about reeds and stops... most not pertaining to your original post, but good info to share since I came across it...
"The MOSSBARGER REED STOP is a solid design to help increase the crankcase pressure for more power." 
This setup comes with "tension adjusting reed stops"... www.1dirracing.com/catalogs/product.php?productid=16148&js=n
Good info about reeds... snowmobile.off-road.com/snowmobile/article/articleDetail.jsp?id=253738
From A. G. Bell... " Don't ever bend the reed stops to increase reed lift and don't ever fit a spacer under the stop to increase reed lift. Either practice will cause petal flutter at higher rpm, because the reed becomes unstable (i.e., out of control). On the average 125 motocrosser, increasing reed lift by just 0.7mm will knock 2hp off the top end between 9000 and 10500rpm." |
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Post by stepthrutuner on Mar 4, 2010 14:48:07 GMT -5
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Post by 90GTVert on Mar 4, 2010 15:07:18 GMT -5
Some more designs for you to compare... Stock minarelli  From Autotech355  Malossi reeds I use now (beside Autotech)  The Malossi cage has worked well for me with no stops. My max RPM is about 10,000, usually cruising around 9,000-9,500. |
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Post by 2strokd on Mar 4, 2010 15:20:22 GMT -5
Heres a pic of the Stage6 cage i just got. You can run it with the stops, or without. Also came with a 24mm and a 26mm stuffer, and an intake.  |
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Post by 90GTVert on Mar 4, 2010 15:32:52 GMT -5
Nice setup. Lots of stuff to play with.
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Post by stepthrutuner on Mar 4, 2010 23:05:23 GMT -5
Interestingly enough. that stock Minarelli set up is something along the lines that I have been thinking would be a good design.... the holes to lessen the damping and the slot to aid charge release. Thanks for posting the pics guys. This is kind of an interesting topic for me.
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