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gone-ot · 03-31-2012, 02:41 PM

The purpose of EFI is to more precisely 'control' both the quantity of fuel injected and the timing of its injection...two aspects of fuel economy (FE) and power (HP) that the common pressure-differential carburetor cannot match...perform reasonably well? Yes, but match or exceed, NO WAY!

First, the carburetor functions on pressure difference--vacuum--which means its susceptable to atmospheric and altitude changes...EFI is a VERY stable constant volume and pressure device, albeit a computer-controlled system. Typical, normal-aspiration engines only achieve about 14.7 psi differentials at best, whereas a pressure-differential of over 2000-2500 psi is possible/common with today's EFI high-pressure piezo-injector systems. It's like the HUGE difference between raindrops and weather's mist!

Droplettes of gasoline don't burn very well nor very fast, resulting in less HP and even less fuel economy...while, the closer the gasoline volume within the air-fuel mixture is to a 'true' vapor, the more HP and better fuel economy...with LESS gasoline going out the tailpipe as emissions.

03-31-2012, 02:41 PM	#83 (permalink)
gone-ot ...beats walking... Join Date: Jul 2009 Location: . Posts: 6,190 Thanks: 179 Thanked 1,525 Times in 1,126 Posts	The purpose of EFI is to more precisely 'control' both the quantity of fuel injected and the timing of its injection...two aspects of fuel economy (FE) and power (HP) that the common pressure-differential carburetor cannot match...perform reasonably well? Yes, but match or exceed, NO WAY! First, the carburetor functions on pressure difference--vacuum--which means its susceptable to atmospheric and altitude changes...EFI is a VERY stable constant volume and pressure device, albeit a computer-controlled system. Typical, normal-aspiration engines only achieve about 14.7 psi differentials at best, whereas a pressure-differential of over 2000-2500 psi is possible/common with today's EFI high-pressure piezo-injector systems. It's like the HUGE difference between raindrops and weather's mist! Droplettes of gasoline don't burn very well nor very fast, resulting in less HP and even less fuel economy...while, the closer the gasoline volume within the air-fuel mixture is to a 'true' vapor, the more HP and better fuel economy...with LESS gasoline going out the tailpipe as emissions. Last edited by gone-ot; 03-31-2012 at 02:56 PM..