Supercharged 540 Camshaft
12-22-2016, 08:32 PM
#55
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I think the 420 is a good blower, but I don't know if I would invest the money to do a bunch of mods to it, aside from a good rebuild, fresh strips, etc. The couplers and main shaft are the weak link . Blower shop does offer a Billet front cover, and option to run their snout on them, as well as replacement shaft and coupler. For a low boost boat application, they work pretty good. I don't think that be the blower I want for a blown alcohol setup though, with high overdrive/boost, and lots of stress on the stock snout, etc.
The one thing I like about the straight 2 lobe rotors, is the fuel distribution is good. You really don't get the big variance from front to rear cylinders with fuel distribution, or bank to bank, like you do with a twisted rotor that pushes the charge to one end.
12-22-2016, 08:40 PM
#57
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Im not sure I buy that. B&M did some extensive testing on a 2 lobe, vs 3 lobe GMC 671 blower, when developing the 420 Megablower. There just wasnt much difference. The concept behind the two lobe rotor, is that the rotors take up less space inside the case, which allow for more air to be available per revolution.
I think the 420 is a good blower, but I don't know if I would invest the money to do a bunch of mods to it, aside from a good rebuild, fresh strips, etc. The couplers and main shaft are the weak link . Blower shop does offer a Billet front cover, and option to run their snout on them, as well as replacement shaft and coupler. For a low boost boat application, they work pretty good. I don't think that be the blower I want for a blown alcohol setup though, with high overdrive/boost, and lots of stress on the stock snout, etc.
The one thing I like about the straight 2 lobe rotors, is the fuel distribution is good. You really don't get the big variance from front to rear cylinders with fuel distribution, or bank to bank, like you do with a twisted rotor that pushes the charge to one end.
I think the 420 is a good blower, but I don't know if I would invest the money to do a bunch of mods to it, aside from a good rebuild, fresh strips, etc. The couplers and main shaft are the weak link . Blower shop does offer a Billet front cover, and option to run their snout on them, as well as replacement shaft and coupler. For a low boost boat application, they work pretty good. I don't think that be the blower I want for a blown alcohol setup though, with high overdrive/boost, and lots of stress on the stock snout, etc.
The one thing I like about the straight 2 lobe rotors, is the fuel distribution is good. You really don't get the big variance from front to rear cylinders with fuel distribution, or bank to bank, like you do with a twisted rotor that pushes the charge to one end.
12-22-2016, 08:52 PM
#58
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Right again but... something to be said about a nasty sounding roller while taking full advantage of dry pipes isn't all bad either. I'm surprised how much blowers have gone up in price over the years. I get what your saying though. If I go SC I might have to consider some saddle tanks!!!
12-23-2016, 06:02 PM
#59
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I just need to know the thoughts on what RPM do we want to run the engine at after seeing what a dyno shows. Are we looking for peak HP or peak torque or somewhere in between. I had always thought running at peak torque was stressful on the engine. Please give me your thoughts. Thanks!
12-23-2016, 08:56 PM
#60
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I just need to know the thoughts on what RPM do we want to run the engine at after seeing what a dyno shows. Are we looking for peak HP or peak torque or somewhere in between. I had always thought running at peak torque was stressful on the engine. Please give me your thoughts. Thanks!
