Veteran racer and supercharging and fuel injection guru, Gale Banks, blogs about the good old days and the great new days.
In the days before O2 sensors, we read the spark plugs to determine the proper air/fuel mixture. Unfortunately, to get the plugs to read like Art Chrisman taught me, I had to give away a load of my sea level power. My jetting was perfect back in Long Beach. But off the trailer at Bonneville, my Chevy was blubbery rich. Where I wanted a light grey band around the base of the porcelain, a color I named 12 to 1, I had black.
Then it really hit me, all eight butterflies were standing on end. I was at wide-open throttle, there wasn’t any more. So, if I’m ever going to go really fast on the salt, I gotta figure out this air density thing. That’s what blowers do, right?
Ok, maybe Geisler had a small influence. It starts with air pressure. If you depend solely on Mother Nature’s force to push the air into your engine, you’re a victim. If you “huff that thing” with a supercharger or a turbo, you’re the master of the universe! That is if you do it right.
Here’s what I’m leading up to with this history lesson, a completely new way of measuring the potential of the air you are supplying into your intake manifold. Yes it reads boost, no that’s not the bottom line…it’s just the force. Air density, in the intake manifold is what’s being forced. That’s the bottomline and it can vary greatly at the same boost.
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high-performance upgrades from Gale Banks, http://bankspower.com/