I would like to share some great information I use when porting my cylinder heads. Some time ago I came across a great package of nine great cylinder head porters and have shared their knowledge on a 10 CD package. This is a must have for the serious enthusiast and more for the professional head porter.
The name of the product is AirFlow Experts and is available in here.
Some of the subjects covered:
- What are your core beliefs on air flow?
- How do you get the most out of a head?
- How do you shape the all important short turn?
- How would you design a port from scratch?
- How do you calculate the following?
- Valve size needed
- Port size needed
- Window size needed
- Bowl size needed
- Seat ring ID needed
- Where are the biggest airflow restrictions?
- Differences in porting the intake port and exhaust port?
- Take us through the steps you take when porting a head.
- What are your favorite airflow formulas?
- How does porting a four valve head differ from a two valve?
- Air Flow Testing Tools:
- Flowbench - Best? Cheapest? Building your own?
- Diagnostic tools (flow balls, pressure probe, velocity probe, etc)
- Getting accurate results
- Duplicating your work (Templates, gauges, et)
- Modifications - Area Specific:
- Gasket - Area? Shape? Height?
- Pushrod - Area? Width?
- Roof - Width? Tip? Angle?
- Floor - Width? Tip? Shape?
- Walls - Shape?
- Window - Area? Shape?
- Short turn - Height? Width? Corners? Radius?
- Bowl - Width side to side? Width front to back? Depth? Shape?
- Guide - Shape? Height?
- Seat - Shape? Transition to bowl?
- Combustion chamber - Squish side? spark plug side? valve shrouding? Shape?
- Valves:
- Diameter - How do you decide?
- Face - Angle? (45', 55', etc) Width?
- Back cut - Angle(s)? Width?
- Shape? (Nail, Tulip, etc)
- Fixing flow problems:
- Poor low lift - What areas to focus?
- Poor mid lift - What areas to focus?
- Poor high lift - What areas to focus?
- CFM backs up at upper lifts - What areas to focus?
- Turbulent (noisy) - What areas to focus?
- Reverse flow - How to test? What to do?
- Swirl - What is it and how do we use it to improve power. You might be surprised by his answer
- Epoxy - When to use?
- Welding - When to use?
- How to get the most out of engine simulation software
- I hear Winston Cup teams are using Extrude Hone in a different way, what are they doing? This was a real eye opener.
- The biggest head porting mistakes you've seen?
- Current trends in porting?
- Biggest discoveries you’ve made working on cylinder heads?
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