how much boost does a 671 blower make

Blower SelectionWhile there are a host of Roots-style blowers on the market, in our particular case, the engine involved-a 392 Chrysler-had a great deal to do with our choice. Pulley size is a direct function of RPM of the blower & not directly boost. Going with a 12-71 at 29% over. There are two different 671 blowers commonly used. Because boost depends on how fast the impeller spins, these units generally do not create as much boost at low rpms (turbo lag), because the impeller is not spinning fast enough. However, if your vehicle already produces good low-end power and torque, a centrifugal blower is the best choice for maximizing high-rpm power. Dans right Every engine is going to be different, a set up making 8lbs of boost on my engine might make 10 on yours. I hope your new builder has some blower experience. Firstly the 4-71 blower will be out of air even on a healty 350. We ran a 6-71 at 29% over, am I right in thinking that a 12-71 will make more boost than the 6-71 we had on it ? The out-of-the-box pulleys only made 2 psi boost, gaining 82 hp and 70 lb-ft over zero boost. These boost readings were measured at wide open throttle and with the engine under load at 6000 RPM using a large bore blower unless otherwise specified. You can't simply rev the blower higher because its air flow efficiency will drop real fast after about 20% overdrive, in other words, this lil blower will choke a 468" for sure. The answer to the question, "How much boost does it make"? Many people assume a blower is making boost 100% of the time. can only be answered at WOT. Lots of horsepower for little money can make you happy, but it's not always easy to find. 09-20-06 06:37 AM - Post# 1005401 In response to Dan_Lockwood Ive been doing a lot of learing on the topic in the past year. We Bolt on a Weiand 142 Blower and Make 470 hp. Is there a formula to figure out how much boost a blower will build by blower size the amount of overdrive and engine displacement ? Excuse me , I don't think so. much longer on a larger blower. We ordered a 2.85-inch blower pulley (PN 6790, $71) and used it … The engine is a AJ 481X 4.5" bore with a 3.5" stroke. You can hurt it in a hurry. In actuality, the blower normally only goes into boost when the throttle is opened substantially or when the vehicle is under load, such as going up a steep hill or pulling a trail-er. Blower!First, we made no changes to the baseline combo except to add the Weiand 8-71 blower, which comes as kit PN 7186 for big-block Chevys, $2,519 at Summit Racing (a polished version is … In order to make boost, the blower must get air, and dur- if you have a mild small block lets say, with a 6-71 kit builds 8 lbs of boost, later you put a big block, with good heads, cam , now you only see 4 lbls of boost, this means that the big block is more efficent at getting the air through the motor and does not have as much pressure in the intake. As far as boost is concerned, at 1-1 on the overdrive, you should still make about 3-6 lbs of boost just because it's forced into the manifold. Re: Blower boost? The boost levels listed in our charts are based upon an average that was determined by 39 years of experience testing superchargers. 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