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Flat reed valve orientation

Old 06-16-2016, 09:15 AM
  #1  
bako
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Default Flat reed valve orientation

Hello folk!
I have sv26cc engines with rear mounted walbro carburator. Both of them have flat type reed valve, which when opening are directing air mixture at the bottom of crankcase. What if I will install reed valve housing upside down, so the airfuel flow will be pointed directly to the cylinder ports?
Do I loose top end power because of that right now?
Right now the valve is mounted with bolts down. Im thinking to install it bolt up.
Here u can see the type of valve this engine has:
http://www.hobbyking.com/hobbyking/s.../148000030.jpg
Old 06-16-2016, 02:44 PM
  #2  
w8ye
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You need to document the rpm when installed both ways?

I doubt it making a noticeable difference for when the reed valves are open, the piston is headed up and the intake charge is not going up the intake transfer passages.

The intake charge moves up the intake transfer passages when the piston is headed down and the reeds are closed.
Old 06-18-2016, 04:22 PM
  #3  
prigai
 
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Originally Posted by bako View Post
Hello folk!
I have sv26cc engines with rear mounted walbro carburator. Both of them have flat type reed valve, which when opening are directing air mixture at the bottom of crankcase. What if I will install reed valve housing upside down, so the airfuel flow will be pointed directly to the cylinder ports?
Do I loose top end power because of that right now?
Right now the valve is mounted with bolts down. Im thinking to install it bolt up.
Here u can see the type of valve this engine has:
http://www.hobbyking.com/hobbyking/s.../148000030.jpg
When the piston is on the way up the cylinder and the piston ring goes past the top of the intake ports, the vacuum created in the crankcase sucks a new charge via the reed valve. There is no operational benefit in pointing the reed valve up the cylinder but it may interfere with the conrod and crankpin on the circular motion up. Not a good idea but if you insist you wish to try please share your experience.

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