Posted by RN on January 06, 2014 at 17:08:08 from (205.213.104.118):
In Reply to: HP vs Cu. In. posted by Texasmark1 on January 06, 2014 at 14:04:46:
258 cubic inch AMC Jeep engine gets 150hp at 4400 rpm in 1970s- but 120hp in Germany using DIN instead of SAE standards. 258 tractor engine at likely 1600 rpm in 1960s, maybe 2000 rpm for IHC industrial and a JD would be turning maybe 1200 rpm for a 50 or 60 series about that size twin- B"s had a 170 some inch engine pre-WW2 and 25 hp at 900 rpm or so. early compression ratios for a distillate were about 4.5 to 6:1 depending again on manufacturer. High compression, high altitude pistons were 6.5 to 7.5:1 and that was about all a N Ford could handle without detonation with 1950s leaded fuels. Harley engine 1960s were about 1/2 hp cubic inch at 4000 for W, G 45 inchers, 55 hp for FL panheads 74 inchers with 7:1 compression ratio- The FLH had about 8:1 compression more duration on cam and rated 65 hp at 5000 rpm. VW beetle engine same displacement was about 6.5:1 or 7.3:1 and rated 30 or 36hp DIN 4000/4400 rpm- SAE rating was 40hp and they were advertised as such in US. Air flow by port size, valve size and valve opening and duration open is a critical factor, compression ratio and operating speed another. A sort stroke, big bore engine can have bigger valves than a small bore, long stroke- so a 4 inch stroke, 3 inch bore IHC H compare to a 3 inch stroke 4 inch bore Chevy 150 inch engine about same displacement as the H running 4400 rpm instead of 1650 rpm would be expected to have more hp. Piston skirt design and speed factors before breakage is a slight limitation to rpm, so is valve spring pressure, mass of valve train as a limitation before valve "float" rpm. 5500 rpm in 1960s with hydraulic zero lash lifter common- solid lifter for racing gave another 1000 rpm with 170 pound valve springs instead of 125/150 pound springs- that was known for the small block chevies, buicks with the roller bearing rockers. Varying features of engines determine hp ratings at flywheel and the rest of drive train adjusts for the hp at ground. RN
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