8/28/2023 0 Comments Supercharger isolator![]() The same 100kW 18000 rpm and 53.0Nm of torque now equals ~1284 N the 41.3mm pulley radius. If we were to change the pulley configuration to a 233.6mm crank pulley and an 82.6mm supercharger pulley for the same drive ratio of 2.829 the number work out as below. In the above example with a 70mm supercharger pulley, we require ~1515 N the 35mm radius of the pulley (1515N of belt load) to drive the system. Under a steady state load (no acceleration load)įor example, we are running the combination of a 198mm crank pulley and 70mm supercharger pulley to achieve this supercharged speed an engine RPM of ~6400. Supercharger drive load (kW) is derived from torque (Nm) and Supercharger (RPM)ġ00kw 18000 rpm translates to 53.0Nm of torque It is sometimes better to think about the overall system rather than just running a 65mm or smaller supercharger pulley. Smaller pulleys also = less surface area, higher belt loads, belt slip and reduced belt life. Smaller supercharger pulleys = more supercharger speed = more boost = more happiness Supercharger Pulley Diameter - smaller is not always the best option On the smaller side of the scale - TVS900 18000 rpm – 2.0 pressure ratio requires around 30kw.On the large side - TVS2650 18000 rpm – 2.0 pressure ratio requires in the region of 100kw.Supercharger drive load, supercharger pulley diameter and engine acceleration rate are a few of the factors that contribute to the direct load applied to the belt. There are many contributing factors to belt load. As the supercharger speed or pressure ratio increases so does the load requirement of the belt, related accessories and idler pulleys. This load is transmitted from the crankshaft through a serpentine belt to the supercharger. ![]() Packaging– can you fit an additional belt pathĭrive load– supercharger size, speed, pressure ratioĮxisting accessory belt size – in most cases there is a pre-existing serpentine beltīelt load applied to the crank nose– the further out the more load in the crank noseĪ separate drive system for the supercharger is most commonly thought of as the best solution but due to the constraints listed above it is not always achievable.Īs everyone knows, to turn a supercharger at a given speed and pressure ratio requires input power. This choice has quite a few factors to consider. Combinations of - All on one belt, shared accessory drives and standalone drive systems exist and all have their benefits and shortcomings.īelts - 6PK, 7PK, 8PK, 10PK, 12PK. Below is a snapshot of some of the different drive systems for varying kits. This requires many varied and sometimes complex drive installations. Most modern supercharger systems are crank driven typically with a serpentine style PK section belt. With the ever-increasing variety of supercharger size, drive ratios, belt routing, belt material and pressure ratios we will be taking a look into the design and choice of drive systems, pulleys and belt selection. Vehicles included in GM's supercharger recall (and vehicles with build dates 4Q 2014 and later) should already be fitted with a solid isolator.DESIGN AND CHOICE OF SUPERCHARGER DRIVE SYSTEMS, PULLEYS, BELTS AND TENSIONERS Note: The installation of Metco Motorsports parts or any aftermarket parts may affect your vehicle's warranty, if applicable. We highly recommend replacing the original isolator with this upgraded unit when an overdrive supercharger is installed on the car. Our coupler is not susceptible to the issues associated with the original unit. Our replacement coupler is precision-machined from a solid piece of high-grade thermoplastic and installs as a direct replacement for the original. The spring in the original isolator wears a groove on the supercharger shaft, creating debris that will eventually cause the shaft seal to fail. The original isolator as installed at the factory contains a spring mechanism and is notorious for noise and a short service life. The supercharger isolator is part of the supercharger drive assembly and is located in the supercharger snout. Solid Supercharger Isolator GM LSA Engine Including 2009 & Newer CTS-V and 2012 & Newer Camaro ZL1 *** ***
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