Blower tech 101
first of all,, what are you going to do with it ?? street drive it ??/local shows ?? cruise nights ???
the difference between 6.71 vs 8.71 is the cubic inch size of the motor you plan on building,,,and its purpose,and your buget,,,if you want to make more then 5 or 6 pounds of boost on a 440 you will need a 8.71 blower,,
boost is made by a combination of compression and drive on the blower,,the more drive the more boost = heat,,, the bigger the blower the more boost created with less drive= less heat,,
on a non computer/tuner motor 93 octane pump gas will only support 9 pounds of boost,,with out detenation,,,,
also another factor cam center line,,vs cylinder pressure vs heat,,,,112 center line is doable on the street but a 114 center line makes more cylinder presure/power/heat
get a book on super charging and read up on it before you walk in to a speed shop and order junk that they have no clue about,,
if your looking to build a street cruise night blower motor,,cal big AL,s toy box he has reasonable pricing on complete motors
i have a 340 7.76 true compression iron heads cam 112 center line 6% under driven on the blower 6.71 blower i make 13 pounds of boost,,fun street car,,, car runs at 178 degrees most of the time,,when its over 88 and humid out it runs 181 degrees,,,with a 4 row radiator and standard flex fan,,,
first of all,, what are you going to do with it ?? street drive it ??/local shows ?? cruise nights ???
the difference between 6.71 vs 8.71 is the cubic inch size of the motor you plan on building,,,and its purpose,and your buget,,,if you want to make more then 5 or 6 pounds of boost on a 440 you will need a 8.71 blower,,
boost is made by a combination of compression and drive on the blower,,the more drive the more boost = heat,,, the bigger the blower the more boost created with less drive= less heat,,
on a non computer/tuner motor 93 octane pump gas will only support 9 pounds of boost,,with out detenation,,,,
also another factor cam center line,,vs cylinder pressure vs heat,,,,112 center line is doable on the street but a 114 center line makes more cylinder presure/power/heat
get a book on super charging and read up on it before you walk in to a speed shop and order junk that they have no clue about,,
if your looking to build a street cruise night blower motor,,cal big AL,s toy box he has reasonable pricing on complete motors
i have a 340 7.76 true compression iron heads cam 112 center line 6% under driven on the blower 6.71 blower i make 13 pounds of boost,,fun street car,,, car runs at 178 degrees most of the time,,when its over 88 and humid out it runs 181 degrees,,,with a 4 row radiator and standard flex fan,,,