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Does anyone have flow rate figures for a standard cylinder head - inlet and exhaust?
What increases (and figures) should you expect from a well flowed head?
And finally, what do these figures actually mean?
Are there any good links to explain the above?
Many thanks
Chris
Some folks measure flow from the air compressor in SCFM, but in my opinion, that’s incorrect. SCFM refers to “Standard” Cubic Feet per Minute of air, and a “Standard” Cubic Foot of air is at 68 deg. F, at sea level, with a specific humidity level, circumstances far removed from the condition of the air discharging from your compressor. For measuring the pressure coming out of the compressor, I use CFM.
You can have compressed air delivered to your application from your compressor at the correct PSI level, and the device may not work properly.
In order for blow guns, spray guns, air cylinders etc. to work satisfactorily, the compressed air has to be delivered to these devices at the correct PSI (that to generate the force required) and also at the correct flow rate ( so that your force is delivered within the acceptable time frame of the air using device).
If the air brush requires 4 PSI of air to work properly, and you supply that air through a pin hole sized tube, then the air brush is getting the correct pressure, but not enough flow to make the paint spray properly. Similarly, 30 PSI delivered to your car’s tire through that same pin hole tube will eventually fill the tire, but it will take unacceptably long time to do so.
So, when you are looking at supplying compressed air for your application remember that you have to consider the compressed air flow (CFM) and that you must have that flow at the specified pressure (PSI) to be sure to generate enough force for your device to work properly.
I'm sort of 30% thru a DIY port job an a 7A head here - project stalled a while back thru lack of funds / space / boredom - I will eventually report back here what gains (if any) I can make. Its a spare head and I just felt the need to cut some metal on it - seemed like there is room for improvement on the factory item.
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