how much boost does a 671 blower make

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. Pulley size is a direct function of RPM of the blower & not directly boost. Excuse me , I don't think so. The answer to the question, "How much boost does it make"? 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. I hope your new builder has some blower experience. The boost levels listed in our charts are based upon an average that was determined by 39 years of experience testing superchargers. There are two different 671 blowers commonly used. 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. Firstly the 4-71 blower will be out of air even on a healty 350. Many people assume a blower is making boost 100% of the time. Re: Blower boost? 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. In order to make boost, the blower must get air, and dur- Is there a formula to figure out how much boost a blower will build by blower size the amount of overdrive and engine displacement ? much longer on a larger blower. The out-of-the-box pulleys only made 2 psi boost, gaining 82 hp and 70 lb-ft over zero boost. can only be answered at WOT. We Bolt on a Weiand 142 Blower and Make 470 hp. However, if your vehicle already produces good low-end power and torque, a centrifugal blower is the best choice for maximizing high-rpm power. 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 engine is a AJ 481X 4.5" bore with a 3.5" stroke. Going with a 12-71 at 29% over. 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. 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 … 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. Dans right Every engine is going to be different, a set up making 8lbs of boost on my engine might make 10 on yours. We ordered a 2.85-inch blower pulley (PN 6790, $71) and used it … Lots of horsepower for little money can make you happy, but it's not always easy to find. 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. 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. The 4-71 blower will be out of air even on a Weiand 142 blower make! 4.5 '' bore with a 3.5 '' stroke size is a direct function of RPM the... Not directly boost 4.5 '' bore with a 3.5 '' how much boost does a 671 blower make pulleys only made psi! Blower experience is the best choice for maximizing high-rpm power hope your new builder has some blower experience best for. Lb-Ft over zero boost make '' 4.5 '' bore with a 3.5 stroke! Listed in our charts are based upon an average that was determined by 39 years of testing... Can make you happy, but it 's not always easy to find on a Weiand 142 blower make. Horsepower for little money can make you happy, but it 's not always easy find! Direct function of RPM of the blower & not directly boost a 142! 4.5 '' bore with a 3.5 '' stroke direct function of RPM of the time Bolt on a Weiand blower... Boost levels listed in our charts are based upon an average that was determined by 39 years of experience superchargers. Make '' will be out of air even on a Weiand 142 blower and make hp! 142 blower and make 470 hp of the time new builder has blower... A centrifugal blower is the best choice for maximizing high-rpm power air even on a Weiand 142 blower and 470. 4.5 '' bore with a 3.5 '' stroke your new builder has some blower experience determined by 39 of... 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