Got to thinking about the intake filling / time thing. Thought I would break it away from the other thread / subject.
So at BDC piston starting up, if diffuser wave timed / working properly it is pulling fresh charge up through transfers while piston is traveling up creating it's vacuum underneath. Stronger wave from pipe would also instigate quicker opening of reeds along with suction from piston. Obviously wave from pipe has to be stronger than suction under piston to get any flow up through transfers so there's conflicting forces going on here.
I've always thought of getting rid of excess volume in the intake / reed box to help with the piston pulling more / quicker. Never thought about the effect on the diffuser wave from the pipe-
Food for thought- I'm coming up with transfers closing @ 54 degrees ABDC.
Center port in reed box opens around 73 degrees+-. 64.25 degrees if a person opens it up downward to flush
(+ .250") Sure would be cool to know that time delay after BDC when the pipe pulling on the transfers etc. opens the reeds.
Or, does the diffuser wave just pull the residual flow running on inertia going up and that's it???????
Comments???!!!!!
So at BDC piston starting up, if diffuser wave timed / working properly it is pulling fresh charge up through transfers while piston is traveling up creating it's vacuum underneath. Stronger wave from pipe would also instigate quicker opening of reeds along with suction from piston. Obviously wave from pipe has to be stronger than suction under piston to get any flow up through transfers so there's conflicting forces going on here.
I've always thought of getting rid of excess volume in the intake / reed box to help with the piston pulling more / quicker. Never thought about the effect on the diffuser wave from the pipe-
Food for thought- I'm coming up with transfers closing @ 54 degrees ABDC.
Center port in reed box opens around 73 degrees+-. 64.25 degrees if a person opens it up downward to flush
(+ .250") Sure would be cool to know that time delay after BDC when the pipe pulling on the transfers etc. opens the reeds.
Or, does the diffuser wave just pull the residual flow running on inertia going up and that's it???????
Comments???!!!!!
Last edited:
