From that seems to workout to an average of 20 hp per 1 psi or 100 hp per 5 psi.
blower torque
- Thread starter chorty55
- Start date
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After reading through this post and remembering what I have been through with mine I guess I will chime in.
My 340 has a stock forged crank with a single key and a Mopar performance steel balancer. I started out with a stock 340 balancer. I have no idea how much HP it takes to turn my Dyers 6-71 blower. To me that is not in the equation as HP is calculated at the flywheel or the rear wheels and both of those are calculated after the blower takes it's HP from the engine. So to my way of thinking, if your engine makes 300 HP before the blower is installed and it makes 450 HP after it is installed then it is making 150 HP plus whatever it takes to turn the blower. That is about as simple as I can say it. Now back to the keyways. I did a lot of research into how much boost you can make and not harm a single keyway in a forged crank. It appears the magic number is about 12 lbs of boost. I got foolish and played with my pulleys and took my 6-71 up to 12 lbs of boost. I got lucky and it only cost me a new balancer and timing cover before I did any serious damage to the engine. I believe it also started to push out my head gaskets at that time but that didn't show up for a while afterwards. I also broke a snout shaft at a later date but I think that was due to metal fatigue. Let me tell you, there is a big difference between boost and no boost. lol I now run my 340 with 9 lbs of boost, timing locked at 31 degrees and 91 octane. It runs hard and is very dependable with the EFI setup which I highly recommend. The efi is easier to tune than carbs and give it much better street manners.
Jack
My 340 has a stock forged crank with a single key and a Mopar performance steel balancer. I started out with a stock 340 balancer. I have no idea how much HP it takes to turn my Dyers 6-71 blower. To me that is not in the equation as HP is calculated at the flywheel or the rear wheels and both of those are calculated after the blower takes it's HP from the engine. So to my way of thinking, if your engine makes 300 HP before the blower is installed and it makes 450 HP after it is installed then it is making 150 HP plus whatever it takes to turn the blower. That is about as simple as I can say it. Now back to the keyways. I did a lot of research into how much boost you can make and not harm a single keyway in a forged crank. It appears the magic number is about 12 lbs of boost. I got foolish and played with my pulleys and took my 6-71 up to 12 lbs of boost. I got lucky and it only cost me a new balancer and timing cover before I did any serious damage to the engine. I believe it also started to push out my head gaskets at that time but that didn't show up for a while afterwards. I also broke a snout shaft at a later date but I think that was due to metal fatigue. Let me tell you, there is a big difference between boost and no boost. lol I now run my 340 with 9 lbs of boost, timing locked at 31 degrees and 91 octane. It runs hard and is very dependable with the EFI setup which I highly recommend. The efi is easier to tune than carbs and give it much better street manners.
Jack
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