Zylinderkopfkompression

[ami74]

folgendes hab ich gefunden:



Years: 1970–1972

The LT-1 was the ultimate 350 cu in V8, becoming available in 1970. It used solid lifters, 11:1 compression, the '178' high-performance camshaft, and a 780 CFM Holley four-barrel carburetor on a special aluminum intake, with rams' horn exhaust manifolds in the Chevrolet Corvette, Delco transistor ignition and a low-restriction exhaust to produce a factory rated 370 bhp at 6000 rpm and 380 lb-ft at 4000[8] (the NHRA rated it at 425 hp for classification purposes). Redline was 6500 rpm but power fell off significantly past 6200 rpm. The LT-1 was available in the Corvette, Corvette ZR-1, and Camaro Z28. Power was down in 1971 to 330 bhp and 360 lb-ft of torque with 9:1 compression, and again in 1972 (the last year of the LT-1, now rated using net, rather than gross, measurement) to 255 bhp and 280 lb-ft.

The "LT1" designation was later reused on a Generation II GM engine, the LT1.

L82

Years: 1973–1980

The 1973–1974 L82 was a "performance" version of the 350 that still used the #624 76cc chamber LT-1 "2.02" heads but with a Rochester Quadra-jet 4-Bbl carburetor and dual-plane aluminum intake manifold, an updated version of the 350hp 327 hydraulic-lifter cam, and 9:1 compression forged-aluminum pistons producing 250 bhp (`73 was the first year for SAE net hp rating, as installed in the vehicle with accessories and mufflers) and 285 lb-ft of torque. Its cast-aluminum LT-1 valvecovers were painted crinkle-black contrasting with the aluminum manifold and distributor housing. It was down to 205 bhp and 255 lb-ft of torque for 1975. It produced 210 bhp in the Corvette for 1976-1977. The 1978 L82 recovered somewhat, producing 220bhp and 260lb-ft in the Corvette and in 1979 it produced 225 bhp in the Corvette. In 1980, its final year, it produced a peak of 230 bhp.[6] This engine was also available on the Chevrolet Camaro.

L81

Years: 1981

The L81 was the only 5.7 L (350 cu in) Corvette engine for 1981. It produced 190 bhp and 280 lb-ft of torque from 8.2:1 compression, exactly the same as the 1980 L48, but added computer control spark advance, replacing the vacuum advance[9]

L83

Years: 1982, 1984

The 1982 L83 was again the only Corvette engine (and only available with an automatic transmission) producing 200 bhp and 285 lb-ft of torque from 9:1 compression. This was again the only engine on the new 1984 Vette, at 205 bhp and 290 lb-ft of torque. The L83 added Cross-Fire fuel injection (twin throttle-body fuel injection). Since GM did not assign a 1983 model year to production Corvettes, there was also no L83 for 1983.[6]

L98

For the new Generation IV V8, see GM L98.

Years: 1985–1992

The new 1985 L98 added tuned-port fuel injection "TPI", which was standard on all 1985–1991 Corvettes. It was rated at 230 bhp for 1985-1986, 240 bhp for 1987-1990 (245 bhp with 3.07:1 rear axle ratio (1988-1990 only)), and 245 bhp in 1991 (250 bhp with 3.07:1 rear axle). Aluminum cylinder heads (Corvette only) were released part way through the 1986 model run and continued through the end of L98 Corvette production in 1991.[10] The L98 V8 was optional on 87–92 Chevrolet Camaro & Pontiac Firebird models (rated at 225 hp (168 kW)-245 hp (183 kW) and 330 lb·ft (447 N·m)-345 lb·ft (468 N·m)) 1987 versions had 10 hp (7 kW) and 15 lb·ft (20 N·m) more thanks to 9.5:1 compression and a change to hydraulic roller camshaft. Compression was up again in 1991 to 10:1 but output stayed the same.

[hier-kommt-kurt]

Ja, das trifft es recht gut. Allein mit statischer Verdichtung ist noch nicht allzuviel über die Leistung und das Drehmoment gesagt. Mercedes hat zu dieser Zeit mit 8.2 zu 1 Verdichtung aus 4.5 Liter etwa 200 DIN PS herausgeholt und aus 5.0 etwa 240 und aus 5.6 etwa 240. Mit 10:1 aus 5.6 etwa 300. Das sind ungefähr auch die Prospektangaben von GM aus den 60ern und 70ern. Nur sind die Motore eben nicht vergleichbar. Der eine auf Spitzenleistung bei viel Drehzahl ausgelegt, der andere mehr auf Drehmoment bei mittleren Drehzahlen. Ich persönlich würde einen 350er Chevy mit 10:1, guten Köpfen und ordentlicher Vergaserei und richtig berechnetem Auspuff mit passender Hinterachse bei etwa 250 - 280 PS ansiedeln, was ungefähr dem deutschen Standard aus dieser Zeit entspricht.