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Valves - Explanations Please

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ok.

I now know that reed valves control the flow of air/fuel mixture going into the cumbustion chamber... they turn fuel and air into a cloud of mist so that it can be burnt in the engine...

Can you guys please explain the differences between these valves and when they are used?

  • 607 Reeds
  • Boyseen Valves
  • V-Force3 Valves
  • RAD Valves
    Carbon Tech Carbon Fiber reeds. They have two kinds: LT (low tension - bottom end) and HT (high tension - top end).
    i understand that Fredette porting, head mod, and bored carb can also help.

Byte

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Ok - they actually don't create the cloud of mist - that is done in the carb, the air pulling past the main jet suck fuel/oil misture into it and it mists immediately once it leaves the jet - this fuel/air mixture (mist) is allowed into the combustion chamber through the opening of the reeds, the backpressure created in the pipe from the simultaneouly exiting exhaust gasses forces the reeds back nto their seats (closing them) thus keeping the fresh gasses in the combustion chamber so the piston can compress them (instead of blowing them back into the carb) and the whole sequence gets repeated again.

There are different reed designs to accomplish the things you've already mentioned - different materials/designs will react differently - opening/closing slower or faster, staying open longer or less - all this affects how your motor reacts. You have to decide what you want to accomplish, then research the reeds in order to pick the ones to do the job. All detailed reed info can be found or obtained from the manufacturers and this is likely your best and most accurate source of info - drop them an email - I'm sure tehy'll be glad to reply so they can sell you on their product.

Porting polishing etc can also have a positive influence on your engine, but if you don't know what you're doing with that, you can just as easily affect your engine in a negative way.

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OK the 607 reeds are Boyesen replacements for your stock reeds and fit the stock cage. The Boyesen valve and the Rad valve are the same thing and it is Boyesen complete replacement reed cage and reeds. The V-Force3 Valve is anonther complete reed cage and reeds. The Carbon Tech are reeds you put on your stock cage.

There job is to open during negative pressure in the crank case to let in fuel air mixture, then close when the pressure is at zero or higher traping the fuel air mixture so it will then have to go up through the transfer ports to the top end of the cylinder. Hope this helps.

Ed

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Thansk alot for this detialed explanation!

Byte

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