GearHead_1
Long Time Member
Great job on a very iconic car.
I think the blower pictured is most likely a 6-71 GM blower (the aftermarket reproduced these but some of the old ones were literally repurposed GM pieces) and the logo behind the braided line appears to be the B&M logo though Weiand also used a slanted box in the same place for its logo. It also looks like the snout might be a Forged Performance snout (they`re big into pressurizing engines, I didn`t know Forged Performance was into US engines). The 6-71`s were roots type blowers and probably the most recognized old school type blowers, winding one of these up would in effect perhaps even double the amount of air to be compressed in a cylinder. There is way more to it than to just say that. The volulmetric efficiency has a great deal to do with heat and trying to keep the intake charge cool. These typically don`t have intercoolers. New blowers deal with this much more efficiently, new ones also change the rotor configuration to be much more effective. There were 2-71`s, 3-71`s, 4-71`s and 8 71`s along with the 6-71`s. Some of the big cubic inch drag cars ran 12-71`s up to 16-71`s, they are huge. Some of these big blowers take 600 or 700 HP just to turn them under pressure. That`s probably way more than anyone really wanted to know.
It`s a great car.
I think this is spot on. There were a variety of companies that made the actual compressor, most to fit on 2 stroke Diesel engines, GM being one of the big ones. Eaton, B&M, Weiand and others were all companies that made the drive system and eventually blowers and the accessories to make the blower fit the engines we`re familiar with and in many instances that includes the actual intake manifolds.
I think the blower pictured is most likely a 6-71 GM blower (the aftermarket reproduced these but some of the old ones were literally repurposed GM pieces) and the logo behind the braided line appears to be the B&M logo though Weiand also used a slanted box in the same place for its logo. It also looks like the snout might be a Forged Performance snout (they`re big into pressurizing engines, I didn`t know Forged Performance was into US engines). The 6-71`s were roots type blowers and probably the most recognized old school type blowers, winding one of these up would in effect perhaps even double the amount of air to be compressed in a cylinder. There is way more to it than to just say that. The volulmetric efficiency has a great deal to do with heat and trying to keep the intake charge cool. These typically don`t have intercoolers. New blowers deal with this much more efficiently, new ones also change the rotor configuration to be much more effective. There were 2-71`s, 3-71`s, 4-71`s and 8 71`s along with the 6-71`s. Some of the big cubic inch drag cars ran 12-71`s up to 16-71`s, they are huge. Some of these big blowers take 600 or 700 HP just to turn them under pressure. That`s probably way more than anyone really wanted to know.
It`s a great car.
