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013: Manifold port matching and engine intake reversion
**This is a replay
from the old podcast series lost to the internet**
Original upload date: 6/10/2020
Now, match porting manifolds. This is the process of modifying ports to align smoothly at the gasket, removing obstructions to the air flow pattern.
Why do this? Well let’s jump into some background info on fluid dynamics. Air is essentially a compressible liquid and conforms to hydraulics.
Whenever a fluid particle changes direction it loses energy. You might read about achieving laminar (or smooth) flow, a characteristic when certain velocities for a given situation are achieved that all the fluid particles move parallel with good efficiency, this is ideal for pipe flow but will never truly occur in an engine intake or exhaust.
Laminar flow requires continuous velocity and this state is not achieved. The flows are stop started by the natural operation of the valves.
For some applications there is benefit in having an uniform obstruction. Whaaat I hear you ask? Well, particularly in carburettor applications, the waves created from the valve operation can cause a phenomenon called reversion.
Carbs rely in vacuum to draw fuel into the air mixture and reversion can sometimes knock fuel particles out of the air stream and push them out the end
of your intake. Not a real safe condition! Now having a uniform reduction or increase transition can capture and reduce the effect of reversion.
Watch the latest YouTube video HERE
Please leave a rating or review if this was useful and check out the rest of the podcast.
Links
YT: Built On Purpose
IG: @built_on_purpose
FB: Built On Purpose
Shop: Kyusha Speed
View all episodes
By Built On Purpose**This is a replay
from the old podcast series lost to the internet**
Original upload date: 6/10/2020
Now, match porting manifolds. This is the process of modifying ports to align smoothly at the gasket, removing obstructions to the air flow pattern.
Why do this? Well let’s jump into some background info on fluid dynamics. Air is essentially a compressible liquid and conforms to hydraulics.
Whenever a fluid particle changes direction it loses energy. You might read about achieving laminar (or smooth) flow, a characteristic when certain velocities for a given situation are achieved that all the fluid particles move parallel with good efficiency, this is ideal for pipe flow but will never truly occur in an engine intake or exhaust.
Laminar flow requires continuous velocity and this state is not achieved. The flows are stop started by the natural operation of the valves.
For some applications there is benefit in having an uniform obstruction. Whaaat I hear you ask? Well, particularly in carburettor applications, the waves created from the valve operation can cause a phenomenon called reversion.
Carbs rely in vacuum to draw fuel into the air mixture and reversion can sometimes knock fuel particles out of the air stream and push them out the end
of your intake. Not a real safe condition! Now having a uniform reduction or increase transition can capture and reduce the effect of reversion.
Watch the latest YouTube video HERE
Please leave a rating or review if this was useful and check out the rest of the podcast.
Links
YT: Built On Purpose
IG: @built_on_purpose
FB: Built On Purpose
Shop: Kyusha Speed