Knock-limited performance tests of 2,2,3,4-tetramethylpentane, 2,3,3,4-tetramethylpentane, 3,4,4-trimethyl-2-pentene, and 2,3,4-trimethyl-2-pentene in small-scale and full-scale cylinders /

Each of the four hydrocarbons was individually blended in various concentrations with three base fuels: S-4 reference fuel, S-4 plus 4 ml TEL per gallon in the final blend, and a blend of 87.5 percent s-4 plus 12.5 percent n-heptane plus 4 ml TEL per gallon in the final blend. Data were obtained for the four hydrocarbons to determine the following antiknock characteristics: (a) blending sensitivity, (b) sensitivity of the blends to inlet-air temperature, (c) lead susceptibility of the blends, and (d) correlation of full-scale and small-scale engine results.Knock-limited tests were conducted with F-4, F-3, and 17.6 small-scale engines and with a full-scale cylinder on blends containing the following purified hydrocarbons: 2,2,3,4-tetramethylpentane, 2,3,3,4-tetramethylpentane, 3,4,4-trimethyl-2-pentene, and 2,3,4-trimethyl-2-pentene.Prepared at the Aircraft Engine Research Laboratory, Cleveland, Ohio.Originally issued as NACA as Advance Restricted Report E6C04 (March 1946).NACA Wartime Report E-236.Includes bibliographical references.Each of the four hydrocarbons was individually blended in various concentrations with three base fuels: S-4 reference fuel, S-4 plus 4 ml TEL per gallon in the final blend, and a blend of 87.5 percent s-4 plus 12.5 percent n-heptane plus 4 ml TEL per gallon in the final blend. Data were obtained for the four hydrocarbons to determine the following antiknock characteristics: (a) blending sensitivity, (b) sensitivity of the blends to inlet-air temperature, (c) lead susceptibility of the blends, and (d) correlation of full-scale and small-scale engine results.Knock-limited tests were conducted with F-4, F-3, and 17.6 small-scale engines and with a full-scale cylinder on blends containing the following purified hydrocarbons: 2,2,3,4-tetramethylpentane, 2,3,3,4-tetramethylpentane, 3,4,4-trimethyl-2-pentene, and 2,3,4-trimethyl-2-pentene.Mode of access: Internet