![]() 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. We won’t go through the complicated math of computing compression ratio here because Summit Racing offers a free compression ratio calculator that is very easy to use. Net horsepower was attained from engine dynos with the accessories, OE air cleaner, and factory exhaust system present on the test subject engine. 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. The formula for this cubic inch calculator is. To get 8.0:1 with the preceding rod, stroke, and cam intake closing event, you would need about a. The cubic inches of an engine is the measure of the swept volume of all of the pistons in the bores, not including the combustion chamber itself. Using the Summit Compression Calculator I was able to find the new compression ratio with the following information of the build. As a general rule, the best available pump gas will work with an 8.0:1 dynamic compression ratio. One horsepower is equivalent to the amount of force needed to lift 550 lbs of weight within a period of 1 second. Our cubic inch calculator will work out the total cubic inches of displacement (cid) for an engine given its bore, stroke and number of cylinders. Watt would call this new unit of measurement "horsepower". of off-board Why some of America's greatest tightwads are using STEAMER data compression. 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. The Summit Laser-Base Filing System is priced at 39,500. 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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