The 310 horsepower rating of a 1973 Pontiac Trans Am SD 455 may seem quite dismal if you're comparing it to something like the 370 horsepower rating of the 1970 Pontiac Trans Am RAIV 400, but the actual difference in the power output of these two engines is much smaller than the 60 horsepower discrepancy indicates. Higher CR ratio means more chance of detonation but tighter quench usually helps ward off detonation.Ideally I wanted. 038 compressed head gasket, and a 118cc head, I calculate about 9. Finally, multiply the result by the stroke to determine the swept volume of the engine. Looking for any feedback on performance and appoximate compression ratio if you have it. Compression Calculator Simply fill in the form below to calculate your compression ratio Bore: (diameter) in. Then, square the result and multiply it by, which is 3.14. While 9:1 is a safe number, maximizing compression is a great way to increase power. This is in order for the engine to safely work with pump gas, which for much of the country, is limited to 91-octane. Net horsepower was attained from engine dynos with the accessories, OE air cleaner, and factory exhaust system present on the test subject engine. Use the formula (cylinder diameter / 2)2 x x stroke to find the swept volume. The standard recommendation for street engines running on pump gas has always been to shoot for a 9.0:1 to perhaps 9.5:1 compression ratio. To make horsepower numbers more accurate to what you would actually see from your engine when installed in your car, for the 1972 model year, American car manufacturers started using "net" horsepower figures. Between the lack of power-robbing accessories and restrictive exhaust systems, the advertised horsepower numbers were quite inflated when compared to today's power figures. Also these power figures were typically attained with a very unrestrictive open exhaust system, along with the lack of restrictive OE air cleaner assemblies. These gross horsepower figures came from engine dyno results in which the tested engine had no real-world accessories attached such as power steering pumps, smog pumps, and or A/C compressors. "Net" HorsepowerĪs for American carmakers, previous to the 1972 model year, the horsepower figures you typically saw in car manufacturer literature and car magazines were "gross" horsepower figures.
One horsepower is equal to 745.7 watts, watts being a unit of power that James Watt also came up with, and the same unit you see everyday associated with things like light bulbs and electrical devices. One horsepower is equivalent to the amount of force needed to lift 550 lbs of weight within a period of 1 second. Watt would call this new unit of measurement "horsepower". Back in the 18th century James Watt was developing steam engines and wanted to come up with a unit of measurement that would indicate the amount of workhorses the steam engine would replace. Horsepower is a measure of the ability to move a certain amount of weight a certain distance, within a certain amount of time.
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