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Technical Information Carburetor Quick Reference 2 Bbl Street 2 Bbl Keith Dorton Competition Truck Avenger™ Street Avenger™ Lo-Rider Avenger™ Street Performance - traditional Double Pumpers™ Supercharger Competition 4150 HP Street 4150 HP Race 4150 Ultra HP Race 4500 HP Dominator® 4500 Ultra HP Dominator®. Replacement Carbs O.E. Muscle Car Carbs Marine 2 Bbl Marine 4 Bbl Performance Marine 4500 HP Dominator® Service/Tuning Manuals Service Parts and Accessories Numerical Listing. Approximately 608 CFM would be required for this engine. However, most Street engines are capable of achieving only about 80% VE; a modified street engine with ported heads, headers, intake and carburetor can achieve about 85% VE; a fully modified race engine can achieve 95% or greater VE. The CFM number arrived at with this formula must be factored by this percentage. As a rule of thumb, vacuum secondary carburetors work best on: • Relatively heavy vehicles • Street gearing • Automatic transmission • Engines built more for low-end torque Conversely, mechanical secondary carburetors seem to work best on: • Relatively light vehicles • Strip gearing (4.11 or numerically higher) • Manual transmission • Engines built more for top-end horsepower. HOW TO SELECT THE RIGHT CARBURETOR SIZE. Volumetric Efficiency Before you can determine the correct carburetor size for your engine, you must know its volumetric efficiency. Volumetric efficiency is an indicator of how well an engine can breathe. The better an engine’s “breathing ability” the higher its volumetric efficiency. Airflow vs. Engine RPM For Model 4150 Double-Pumpers, Model 4165 Spread-Bore, Model 4500 Dominator. Double pumper carburetor. Dual Metering Blocks: • allow fine tuning of secondary jetting. Dual Feed Fuel Inlets: • for constant high volume fuel delivery.
Tags : keith dorton, double pumper, hp street, volumetric efficiency, hp race, street engines, breathing ability, street avenger, dual feed, ported heads, performance marine, manual content, rule of thumb, light vehicles, heavy vehicles
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