- Joined
- Nov 26, 2009
- Messages
- 3,090
Here’s the Axtell intake port compared to a stock 28.5mm port. Drawings were made from port molds sent to me courtesy of Ken Canaga.
The favorable flow chart for this port can be viewed at:
head-flow-testing-t8640-375.html?hilit=axtell#p187375
(middle of page)
and
head-flow-testing-t8640-390.html?hilit=axtell
(middle of page)
You can see that there is not much difference between it and the stock 28.5mm port. Stay with stock valve diameters unless you re-angle the intake valves from 28 to 26.5 degrees or you can have catastrophic valve clash problems. You can see some smoothing of the short curve leading up to the valve seat. Larger re-angled 41mm valves allow a broader curve on the short side of the port – allowing for material removal and blending in to match a re-located valve seat. Some material is removed from the roof - again giving a smoother broader radius and to bring the ID of the port up to approx 30mm. I have accurate AutoCad drawings of this port on a cheap CD if anyone wants to print it out – make templates and duplicate it. The CD also has drawings of the exhaust port.
The favorable flow chart for this port can be viewed at:
head-flow-testing-t8640-375.html?hilit=axtell#p187375
(middle of page)
and
head-flow-testing-t8640-390.html?hilit=axtell
(middle of page)
You can see that there is not much difference between it and the stock 28.5mm port. Stay with stock valve diameters unless you re-angle the intake valves from 28 to 26.5 degrees or you can have catastrophic valve clash problems. You can see some smoothing of the short curve leading up to the valve seat. Larger re-angled 41mm valves allow a broader curve on the short side of the port – allowing for material removal and blending in to match a re-located valve seat. Some material is removed from the roof - again giving a smoother broader radius and to bring the ID of the port up to approx 30mm. I have accurate AutoCad drawings of this port on a cheap CD if anyone wants to print it out – make templates and duplicate it. The CD also has drawings of the exhaust port.