The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Anybody ever heard of "Fish" Carburetors and their supposed 100+mpg??

**DANTIP** · 02-07-2011, 02:24 PM

A friend of mine is an engineer at Ford and specializes in port fuel-injection system design. We have had many conversations regarding carburetors, fuel-injection, fuel mix ratios, etc. My wife doesn't hang around long when we talk. Basically, gasoline engines operate properly when the optimum mixture of fuel and air is maintained. These guys get into enormous detail but it comes down to mixing the best/optimum amount of fuel with a given (or measured) amount of air. He admitted the best performing carburetor for road-driven vehicles is a properly set-up Quadrajet. Their testing shows a Q-Jet can approach port fuel-injection performance and economy.

Claims of dramatically better fuel economy with different gadgets aren't real.

My friend did convince me to buy a digital read-out system for carburetor set-up. These devices rely on an O2 sensor (you have to weld a bung into the exhaust pipe) to give you a mixture readout. With this and a setup procedure for the Q-jet, you can feel good about your carb performance. Indiana does not require any testing of tailpipe emissions, but I'll bet the mixture device could help you nail a lean setup that would aid in passing a sniff test.

02-07-2011, 02:24 PM	#15
DANTIP Registered User Join Date: Sep 2001 Location: Fort Wayne, Indiana, USA Posts: 1,880	Re: Anybody ever heard of "Fish" Carburetors and their supposed 100+mpg?? A friend of mine is an engineer at Ford and specializes in port fuel-injection system design. We have had many conversations regarding carburetors, fuel-injection, fuel mix ratios, etc. My wife doesn't hang around long when we talk. Basically, gasoline engines operate properly when the optimum mixture of fuel and air is maintained. These guys get into enormous detail but it comes down to mixing the best/optimum amount of fuel with a given (or measured) amount of air. He admitted the best performing carburetor for road-driven vehicles is a properly set-up Quadrajet. Their testing shows a Q-Jet can approach port fuel-injection performance and economy. Claims of dramatically better fuel economy with different gadgets aren't real. My friend did convince me to buy a digital read-out system for carburetor set-up. These devices rely on an O2 sensor (you have to weld a bung into the exhaust pipe) to give you a mixture readout. With this and a setup procedure for the Q-jet, you can feel good about your carb performance. Indiana does not require any testing of tailpipe emissions, but I'll bet the mixture device could help you nail a lean setup that would aid in passing a sniff test.