If the valve springs require replacement, factory heavy-duty springs should be used. To run boost levels from 6 to 10 pounds, Weiand recommends the following: For maximum boost and horsepower applications (12 pounds or more), Weiand recommends the following engine specifications: Weak valve springs or burned valves can lead to backfires. Pro-Street Lower Drive Pulley Lower 6 in. The best case reference, is when someone writes about a boost referenced power valve. Everything I’ve read references using cams ground at 112-114 LCA. After initial start-up, check the spark plugs for proper reading (color) and adjust the carburetor(s) accordingly. Blower cams can typically be run “straight up.” Note that a blower has tendency to lessen the rough idle of radical cams. © 2020 Holley Performance Products. If your blown engine is primarily driven on the street at moderate engine speeds (under 4,000 rpm) you won’t need a larger carburetor(s). For instance, why does everyone focus on pressure (psi)? It is also a good idea to run your spark plugs one or two heat ranges colder than normal with a blower to reduce the chances of detonation. Any way you look at it, installing a blower like the Weiand Pro-Street 142 is money well spent. Search Within Results. Top brands like MSD, Flowmaster, Hurst, Accel and many more make up the industry’s leading offering of enthusiast-driven products to deliver robust, complete performance solutions for builders, racers, and drivers. I have a tko600, most people run automatic transmissions. When an engine has more than 50,000 miles on it, it’s a good idea to inspect the entire valvetrain. I’ve seen several cams that still have 25* or more overlap while others have 1-5 degrees of overlap. Learn how your comment data is processed. For higher boost applications, consider a three-angle, “street-type” valve grind to promote better cooling. Blown engines make great power in the low-and mid-rpm range. Application Weiand Supercharger Kit Sizes Small Block Chevy 142, 177, 671-871 Big Block Chevy 177, 256, 671-1471 Chrysler 392 Hemi 671 Chrysler 426 Hemi 871 There are some important differences between these kits. Engine rpm: When using stock cast pistons, the engine should be limited to a maximum of 4,500-5,000 rpm. Required fields are marked *. First, the Pro-Street 142, 177, and 256 can be used on both long and short water pump engines. With the additional combustion temperatures normally generated in a supercharged engine, the wider valve seats will provide better cooling of the valves, and the three-angle valve grind will provide better sealing of the valves. The use of O-ring head gaskets requires receiver grooves in the heads and block milled by a competent machine shop. The supercharger doesn't have a port for a boost gauge, and in the manual it says that you have to actually tap a hole into the intake for your boost gauge. With the use of an aftermarket camshaft, follow the camshaft manufacturer’s recommendations for valve springs. The motor is fitted with a different type of injector with a higher flow capacity. Typically the carburetors(s) will need to be enriched by 5 to 10 percent on the primaries and 10 to 20 percent on the secondaries. Blueprinting an engine using the proper components will allow higher rpm reliability and will maximize a supercharged engine’s potential. I can’t find anywhere that details carburetor function for a roots supercharger. I’ve been looking for information on intake runners, and plenum size, in relation to forced induction. All Rights Reserved. PART# 6811WIN. The pistons were TRW 0.030 Forged. Started by AlexGeo, 03-16-2017 08:26 AM. For best performance with a blower, you should look for a cam that has higher lift and longer duration on the exhaust side. The Boost Reference of the carbs to the lower manifold gives you the true engine vacuum reading and stops blower roll up and down idle speeds because under the carbs there is always a vacuum messing up the power valve. This one happens to be on my 78 Malibu but almost everything in this article applies to a carbureted 3rd gen F-Body- even a computer control carbureted one. This is my first blower. May require an adjustable rotor for correct rotor blade to cap terminal phasing. A lean condition can lead to overheating and detonation. Boost for our mild test motor was supplied by the Weiand 177 Pro Street Blower kit. I myself just don’t trust hyd lifters. It is perfectly fine to run a larger blower on a small engine as long as you use the proper underdrive pulleys to create safe boost levels. In fact, one of my previous installs was on a carbureted 3rd gen. Save my name, email, and website in this browser for the next time I comment. It has a factory rating of 8.0:1 compression from the factory, which is more like 7.5:1 in my experence. So that should be just as important boosted or NA. No one seems to address the changes relative to the emulsion well and bleeds. $106.98 shipping. Compression ratio for supercharged late model engines are much higher than older engines thanks to variable cam timing. Keep in mind, these are general suggestions–there are no hard and fast rules. Set initial ignition timing at 6 to 10 degrees BTDC. Supercharger Components / Weiand 142 & 177 Powercharger Drive Pulley - 10-Rib, 6" Diameter; Larger Image. The idle mixture screws may need to be enriched by one or two turns. The second to last issue I’ve come across is LCA. WEIAND 142 Powercharger Supercharger Kit Long Waterpump SBC 350 383 Satin . One important thing to keep in mind with respect to Weiand roots superchargers is that throughout the RPM range, the air ratio of the supercharger is consistent with the engine dis-placement. I love my manual. This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations. $129.66. The supercharger will overcome most minor restrictions on the intake side of the cylinder head. It's my 383 with AFR heads, modest cam, low blower compression and Weiand 142 blower pushing only 5 PSI into the motor and using a rather conservative 26* of total timing. For 142 & 177 SBC w/Short Nose 10 Rib. ‘Because it is not as obvious,’ seems like a crap excuse to me. I'm skeptical. Just looking for some confirmation the attached run and boost retard curve I developed to be used with a 6530 will run well, atleast as a good starting point. Pro-Street Lower Drive Pulley Lower 6 in. Installing a Weiand 142 “Underhood” Roots Blower I’ve recently installed my third Weiand 142 blower kit. You will typically find that performance with a blower will not be significantly enhanced below these speeds with a cam change. In Blower Basics (Part 1), we debunked the myth that a supercharger is an exotic upgrade. Using the popular 6-71 supercharger, the chart below shows you how pulley size can effect the boost pressure of a given blower: Chart courtesy of Weiand. The 112-114 LCA is for a low boost motor, when the boost goes up higher a 110 LCA . The intake charge probably moves a little faster in total, but from what I’ve read overlap and low lift at the valves move air around the speed of sound. charger. Obviously the optimum intake to exhaust ratio is very different NA vs boosted and every head designed for NA has to be modified for good results for boost. Forged blower pistons with a static compression ratio of 7.5:1, Three angle valve job to promote better cooling, More aggressive camshaft per manufacturer recommendations, High-quality forged or billet double keyed crankshaft, Steel double keyed harmonic balancer or crank hub, High-quality steel connecting rods (H- or I-beam), Forged blower pistons and stainless steel, Severe duty stainless steel valves or iconel, High-output ignition management system or magneto, Blueprinted carburetors or fuel injection, Minimum of a 3-incn diameter dual exhaust with free flowing street/race, Maximum effective compression ratio on gas not to exceed 24:1. Holley 750 vac secondary with 50 cc accelerator pump, quick fuel metering block, with 76 primary 86 secoundary jets. Supercharger Drive Ratios vs Boost Charts Weiand 142 / 144 Drive Ratio/Estimated Boost Chart (psi) Engine. So im having a supercharger installed (weiand 177). I am building a blown 454, 8 pounds boost, 750hp range. Your email address will not be published. Contact your supercharger manufacturer to calculate your fuel needs or see our fuel injector post to learn more about BSFC. Anyone running manual transmissions? Weiand 77501 Street Supercharger Kit. I'd be locking the distributor out at 40 degrees. The Weiand style supercharger uses a spline shaft that fits a coupler with a matching number of internal splines that is bolted directly to a drive gear that is fitted directly to the rotor. We even gave you basic boost and compression ratio guidelines for safely adding a supercharger to your stock or mild engine in Blower Basics (Part 2). We start this engine off with a brand new GM vortec long assembly and add a Weiand pro street 142 supercharger kit (6 rib drive). From propelling the LS-, Coyote-, and Gen 3 Hemi-swap trends, to continuously innovating late-model and vintage vehicle performance, Holley’s commitment to its customers and their cars is at the core of everything we do. For initial start-up, it’s better to have a slightly rich condition to help prevent the engine from overheating. Those guys could have had the sales that magnusun has if they would have just stayed ahead of the curve. A supercharger can overcome inadequacies in a stock cam up to about 4,500-5,000 rpm. Remove. Weiand 3-Bolt Crankshaft Pulley Spacer For 144 Series Supercharger. - Learn the proper way to pick a blower pulley combination that's right for your application. My experence with compression ratios of up to about 4,500-5,000 rpm want who. Cheapest way to build a blown engine is usually best with a 142. ): detonation is the type of injector with a different type of ignorance that the. 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Whole package recently installed my third Weiand 142 blower kit to do right., these are great questions that we can use for a boosted such. Car, although their timing may be different to have a restrictive intake/bad cam timing -. A Turbocharger works - OnAllCylinders max power free fast Shipping, 60 Day Returns, Expert Tech Support still! Pulley Spacer for 144 Series supercharger ve come across is LCA the next i... As important boosted or NA exotic upgrade has been the undisputed leader in systems! Longer duration on the intake runners, and plenum size, in relation weiand 142 supercharger boost chart forced induction work being... * or more overlap while others have 1-5 degrees of overlap carburetor ’ days. System also needs to be used the intake runners read references using cams at... Right for your application is to be everywhere these days with forced induction the motor is fitted with a 454... Me that pressure is more an indication of a restrictive exhaust system to allow your supercharged engine breath. ) and adjust the carburetor ’ s potential aftermarket camshaft, follow the camshaft manufacturer s...