RCU Forums - View Single Post - Flat reed valve orientation
View Single Post
Old 06-18-2016, 04:22 PM
Join Date: Sep 2005
Location: , AUSTRALIA
Posts: 73
Likes: 0
Received 1 Like on 1 Post

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:
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.