Reed Stuffer...worth the $$??

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Jan 16, 2006
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#4
My 62t with the R&D stuffers & spacer plate performs well. Snappy throttle response and good power throughout the RPM range. I do not have a dyno to determine the exact numbers from a comparison with & without stuffers, but I think it runs great. One of my friends here has a Boyesen manifold & reeds, if you look at the way it is designed it looks alot like a stock reed cage with stuffers built in. I know that the flow characteristics of the Boyesen have been engineered for performance and that looks can be deceiving but I am not convinced that stuffers could hurt performance that much. I know that they decrease volume before the reed and increase velocity. Not sure if this is good or bad, anyone have any thoughts on this?

Wax, are there any specific articles or comparisons that site performance decrease with stuffers. Just curious,
 
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#5
My superjet has the 62t. I found this on GroupK's website:

"Reeds - The stock Yamaha reeds and cages have consistently outperformed any aftermarket reeds we have tested. Some aftermarket reeds can offer better power for 20 - 30 operating minutes. However after that amount of time the material "looses its memory" or begins to chip. As this happens, the performance of these weakened aftermarket reeds becomes worse than stock.

Aftermarket reed stuffers offer a noticeable improvement in overall acceleration. We consider them to be a good horsepower value and recommend the aluminum Boyesen stuffers for these engine packages."
 

Matt_E

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#6
That article was written quite a number of years ago, well before more modern reeds and reed cages, such as Moto Tassinari's systems, M16's, or RAD valves.
 
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Matt_E

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#8
I don't really have one. :smile:
Never tried reed stuffers.

I believe they work by narrowing down the intake tract right before the reeds, thus speeding up the air flow substantially.
Essentially, that would be the same as filling the "fingers" in 62T cases with epoxy (except that's after the reeds).

Anyhow...if that's what it does, it should improve throttle response, give maybe a bit up top, but you'll loose some bottom and mid.
 
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#10
I know that it makes the reed cage match the intake, this does not make the opening any smaller but it does decrease the volume of the reed cage. I agree that it will increase the velocity inside the reed cage itself and should make the low end throttle response better. I kind of thought of it as a little give and take if you stuff the reeds and also run a reed spacer. Less volume before the reeds but more after. It would be nice to dyno with different combinations and see what works best. With all the different intake, engine, and pipe configurations I would expect that stuffers would provide benefits at a given RPM range on one engine and less power on another. Personally I like mine but would take em out if I knew they would provide a performance increase.
 

Matt_E

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#11
Mile9c1 said:
That wouldn't be the same now, would it :wink:

:biggrin: Admittedly, yes. Still, intake tract volume is reduced to increase air velocity. (And eliminate dead spots in the cages, I suppose)
 

Mile9c1

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#12
For finger filling, I don't really think it increases the velocity any, since the air doesn't flow under the reeds (air flows over the bottom reeds, right?)
 

Matt_E

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#13
I don't know Mike...yeah, that area doesn't get a lot of flow, but I *think* it's still there for some flow (kind of an eddy pool of air, perhaps?)

I may very well be wrong on that...you're the ME (I am just an EE :Banane01:)
 

Mile9c1

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#14
I have no idea how the air flows around down there, but air can't flow through a corner, so you should be able to take out the dead space and not notice a loss in flow. I don't know, I'm putting an engine together right now w/o the fingers filled so I'll see how it goes.
 

Powder

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#19
I only noticed gain, no loss with them. Maybe in higher RPM applications there is a loss but in the low to mid I only noticed gains...but each setup might be different things.
 
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