What happens when you change the angle of a valve?
As the valve starts to open and air begins to flow past the valve, the abrupt change in angles create turbulence that reduces air velocity and flow. This abrupt angle can also cause the air/fuel mixture to separate.
How big are the valves on a 2.4 liter?
Revving to 20,000 rpm, this 2.4-liter engine featured 41.3mm (1.63-inch) solid titanium intake valves with a 1mm (.039-inch) wide 45-degree seat. On top, there were four progressive shallow angles before blending into the stem.
What’s the best angle for a valve job?
This abrupt angle can also cause the air/fuel mixture to separate. So cutting another angle above the primary seat and a third angle below the seat helps smooth out the airflow. That’s why a traditional 30-45-60 degree three-angle valve job produces more power than a stock valve job.
Why do valve seats have a 30 degree top angle?
If you have a 30 degree top angle, the air coming off that seat will be turbulent and you’ll get separation between the air and fuel which hurts power. Increasing the angle allows for a better transition from the seat into the combustion chamber. It’s more efficient, offers less resistance and makes more power.”
Revving to 20,000 rpm, this 2.4-liter engine featured 41.3mm (1.63-inch) solid titanium intake valves with a 1mm (.039-inch) wide 45-degree seat. On top, there were four progressive shallow angles before blending into the stem.
Can a 50 degree valve angle be used?
While some high-performance street-engine owners may claim success with a 50-degree or steeper valve angle, there’s probably a good chance they haven’t compared leak-down numbers recently or run the engine that hard. “The steeper valve angle will wedge the valve a lot harder,” explains David Reher of Reher-Morrison Racing Engines.
Why are there extra angles on valve seats?
The extra angles help the air turn the corner so-to-speak, which reduces turbulence to improve air velocity and flow. It also lessens air/fuel separation to improve combustion, too. Mondello says the traditional three-angle valve job is old hat in today’s performance engines.
As the valve starts to open and air begins to flow past the valve, the abrupt change in angles create turbulence that reduces air velocity and flow. This abrupt angle can also cause the air/fuel mixture to separate.