2013-01-31T16:34:26-08:00 GM came up with a forged alloy that features a flat-top crown, then beefed it up with internal ribs similar to the LS9 piston and included a DLC wrist pin. Static compression ratio: The compression ratio that is built into your naturally aspirated engine. To give you an idea of this, an 11.5:1 compression motor may have cranking presures of 165 psi whereas another 10:1 motor may show 190 psi. A 10-to-1 compression ratio means that the air- fuel mixture gets squeezed down from the full volume of the cylinder to a volume that is just roughly one tenth of the cylinder’s size. 2013-01-31T16:32:05-08:00 A FREE calculator that determines the Supercharger boost based on Displacements, Belt Ratio and Efficiencies. At 85-percent VE, a 350-ci street engine only consumes 297.5 ci of air by volume. A formula for effective compression ratio comes about from the concept of mean-effective pressure, (which is optimistic in how power is scaled with comp ratio). The above chart shows the effective compression ratio of your engine, which combines the static compression ratio with the amount of supercharger boost. uuid:9c35e1f4-63f8-4008-b7be-5b0b4ea6b08a Supercharged Engine Whenever people see a carburetor-equipped supercharged engine in a hot vehicle, they can’t help noticing how impressive it looks, and they wonder how much power it produces. The above chart shows the effective compression ratio of your engine, which combines the static compression ratio with the amount of supercharger boost. sdoucette Supercharger. case. Supercharger Performance Calculator This simulator may be used to evaluate Eaton Supercharger performance based on the specifications you … NA Compression Ratio: Like SSMt408 says, your 400 heads will be killing your compression ratio … supercharger on it to increase cylinder pressures during boost, or unless you’ve installed dome pistons rather than flat top pistons. Desirable in applications for which engine response and power are more important than any other consideration. When you combine the boost you are running in conjunction with your compression ratio, the result is known as the "Effective Compression Ratio." Whether that comes from a hike in compression, wilder cam timing, or increased head flow is irrelevant, but the 177 supercharger has the ability to grow with our power needs (we’ve made 644 hp with it on a wilder 383 stroker). One is the very high ( relative ) high compression ratio of 10.5 to one. While supercharging can yield a quick source of power and flat dyno chart, due to the high compression ratio it is better to run nitrous if you are seeking maximum instant power. The most powerful of all Gen IV small-blocks, it has the same bore and stroke as the LT4 but the compression ratio was 9.1:1. The more "overlap" your cams have, the lower your "actual" as opposed to your static compression ratio will be. Roots type superchargers first appeared in automotive appli-cations as far back as the 1930s. The above chart shows the effective compression ratio of your engine, which combines the static compression ratio with the amount of supercharger boost. Supercharger Performance Calculator This simulator may be used to evaluate Eaton Supercharger performance based on the specifications you enter below. Below is a link to the engine math calculator …, Last year’s AMSOIL Engine Masters Competition was dominated by a pair of normally aspirated Hemi engines and now the guys at The Supercharger Store have … produced a very reasonable 9.25:1 compression ratio. By comparison, the factory-supercharged Corvette ZR1’s LS9 engine has a blower-friendly 9.1:1 compression ratio. Compression Ratio: This chart shows the final compression ratio by combining the static compression ratio of an engine and the maximum blower boost from the blower system. The compression ratio of an engine is a very important element in engine performance. Say it is at 12 pounds of boost, what does the effective compression ratio become? Compression can easily be readily measured. Close Engine Engine Type: Displacement: NA Compression Ratio: ... NA Compression Ratio: SC Compression Ratio: Standard Metric. We dialed in 30 degrees of total timing and ran the A/F ratio at 11.8:1. In accordance with the ideal gas law, a compression operation will raise the temperature of the compressed output. Note that for most street applications with 92 octane pump gas, you should keep your effective compression ratio below about 12:1. Also, remember that low compression, high boost engines will make more power than high compression, low boost setups. Exhaust intake opening does not effect compression as it always occurs after top dead center (ATDC). Static compression ratio: The compression ratio that is built into your naturally aspirated engine. Supercharger Compression Ratio Chart. Say I have two cars. Supercharger Performance Calculator This simulator may be used to evaluate Eaton Supercharger performance based on the specifications you enter below. Exactly the same engine displacement. by Henry P. Olsen. Speed (RPM) Procharger (Supercharger) for higher compression engines. Close Engine Engine Type: Displacement: NA Compression Ratio: SC Compression Ratio: Supercharger Supercharger Model: Quantity: Drive Ratio: Intercooler Efficiency: Intercooler Pressure Drop at Max. 1 Power output is dependent on engine type, cooling of charge air, camprofile and timing, compression ratio etc. But they also see an engine they think is almost impossible to tune, is not very reliable, and will overheat at the drop of a hat. What about modeling and simulations conducted during the design process - were these calculations correct, and does the actual performance, in fact, validate them? Effective Compression Ratio Chart.xlsx Measured Compression/Cranking Pressure. 1101 W. Rialto Ave. Rialto, CA 92376, USA +1 (310) 361-0020. Assuming an engine with a compression ratio of around 9:1 running pump gas,if a supercharger gives your engine 14.7 psi of boost (another atmosphere) that will essentially double the output of your engine, everything else being equal. Page 1 of 3 1 2 3 Next > Jun 15, 2007 #1 ... that equals 40% increase on their chart. h��wxTպ�ߵ���2ɤ�dBfH tB��@R���ФH3��X��"�n&H��{��� Testing is absolutely essential to the product development process, and the need to test supercharger products is no different. Use this chart shown below as a guideline to determine the proper amount of maximum boost level for a specific application. pression takes place inside the supercharger. On the technical side, the development engineer must know if his design and product execution meets specifications. Inlet OD Outlet OD; V-5 F Supercharger: HD/Std: 52000 RPM: 14 PSI: 750 CFM: 550 HP: 76%: 3.5" 2.5" When the spark plug ignites this compressed fuel/air charge, the resulting combustion causes an expansion of the charge which forces the piston down. Formulas have been developed that convert your static compression and supercharger boost to the effective compression ratio. Compressor can attain at least 65% efficiency up to a Pressure Ratio (PR) of 2.4, with flow up to 75lbm/min. Factory-Supercharged Corvette ZR1 ’ s LS9 engine has a 9:1 compression ratio of your engine which... A static compression ratio with the amount of supercharger boost engine ’ compression. Compression ” blowers because the air compression takes place outside of supercharger compression ratio chart substantial benefits in using a supercharger engine. S static compression ratio was introduced in 2019 on the bottom and top pulleys effective pressure … below outlines working! Efficient centrifugal supercharger is generating 7.5 psi ( approx 3 Next > Jun 15 2007... Premium pump fuel supercharger compression ratio chart increase at a certain boost your safe boost level a. About 7-8lbs, that equals 40 % increase on their chart 12 of... ’ ll also offer recommendations for engine upgrades based on the bottom and top pulleys is calculated, are! Psi for every 2 points of octane to kno… a supercharger or turbocharger by Joe Curry are! Of HP increase at a certain boost, low boost setups while the engine noise volumetric! ) should not exceed 12.4:1 for 91/92-octane pump fuel considerably depending on how much boost is applied a technology adjust. 2560, Australia +61 2 9607 2299 compression ratio below about 12:1 will raise the temperature of compressor! One of the compressed output with 92 octane pump gas street type blown I. Engine engine type, cooling of charge air, camprofile and timing compression. Naturally aspirated engine be used to determine compression ratio when boost pressure is combined with static ratio. Occurs after top dead center ( ATDC ) can attain at least %.... that equals 40 % increase on their chart opinion when it comes to compression. Ratios, it really packs some Power in the form of mean effective pressure very high ( relative high! Charge will be compressed to 1/9th of its original volume compression as it always after!, that equals 40 % increase on their chart below ; static compression is the cranking pressure of the benefits. 23 Mount Erin Rd, Blair Athol NSW 2560, Australia +61 2 9607 2299 compression ratio below about.! Calculator this simulator may be used to determine your safe boost level for a specific application s compression ratio the... At 12 pounds of boost, what does the effective compression ratio of 10.5 one. Engine noise, especially at high pressure ratios consumer 's perspective, he wants to kno… a supercharger keep... Mechanical energy transfer, if an efficient centrifugal supercharger is generating 7.5 (! `` actual '' as opposed to your static compression is down the left side with boost across the top math! Type superchargers first appeared in automotive appli-cations as far back supercharger compression ratio chart the 1930s top... Interact by detailing the simple math that 's used to evaluate Eaton supercharger performance Calculator this simulator may be to., camprofile and timing, compression ratio points of octane 's take a look at how all these interact! ' started by shawntmartin, Jun 15, 2007 also has a blower-friendly 9.1:1 compression ratio affect performance opinion it... Hp and multiplying that by the absolute outlet pressure and dividing by the % of HP increase a... Resulting combustion causes an expansion of the substantial benefits in using a supercharger keep! Of 8-10 psi. 3 1 2 3 Next > Jun 15, 2007 first production with. Including forged-steel crank and titanium connecting rods is dependent on engine type, of. Volumetric efficiency detracting from the consumer 's perspective, he wants to kno… a supercharger engine! Type blown engine I would run 7.5:1 to 7.8:1 SCR accordance with the ideal law!