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Old 11-28-2002, 10:31 PM
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Post B&M supercharger...how much boost?

I just got my new engine (Chevy 355) running with a B&M 144 blower and was wondering how much boost can I run with one of these? I'm running a pretty stout bottom end...steel crank, forged low compression pistons, Eagle rods, copper head gasket, 4 bolt mains, moly rings and a blower cam. At present I'm running it with the standard top pulley which puts it at around 4 or 5 lbs of boost. Can I run it with 8 or 9 lbs using octane booster and maybe water injection? Anyone running one of these or even the Weiand mini-blower?

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Old 11-29-2002, 07:29 AM
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Depends on your cam. You need one with 114 lobe seperation.

I ran one a while back. Was only able to get about 6 lbs from it turning it as fast as it would go.
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Old 11-29-2002, 07:41 AM
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Marcus,
I love these supercharged motors. I haven't worked with the B&M however. Your motor sounds strong enough to use what ever they have to offer. Hopefully you don't have too much compression 8:1 Use the octane stuff at higher boost levels. This really isn't the biggest blower in the world but I would think it would put out 8-10 psi on a 355. Increasing the overdrive % will help the low end but you may find the top end boost will drop off as the od % gets higher. One thing to be aware of....exhaust is everything on blowen motors. You can be fooled if you have a restrictive exhaust. The boost will go up but output at the rear wheels stays the same or goes down!! What is happening is that the exhaust gases can't get out of the cylinders fast enough and remain as partially filled cylinders. Adding the forced intake increases the boost reading but cylinder contamination causes reduced power. Complicated but true. I have a T-Bird SC with the factory Eaton blower. Exhaust is the most important thing on these cars. Often adding a good exhaust system will reduce the boost reading!! At the same time HP and Torque increase!! So concentrate your efforts from here to improving the exhaust. There is no tuning effect on supercharged motors..the blower blows it in and some of it out. The pipes simply put it in a convient dumping place.
good luck and have fun. keep us posted.
bentwings
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Old 11-29-2002, 09:58 PM
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At the moment I am building my own 3 inch exhaust using mandrel bends in anticipation of future performance gains. I have planned and designed every aspect of this engine specifically for this model blower and according to B&M (now Holley)I can easily make 500 hp and still use a stock flat hood. I'm using their 10 rib pulleys and have redesigned the tensioner so as to reduce belt slippage. Lobe separation is 114 degrees by the way but as with most supercharger cam profiles is not too crazy with only .488/.465 lift (dual patterned) with more lift on exhaust.
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