Your engine just is not putting out the power that you know it could, and nothing you have done so far has solved the problem. Then a buddy mentions that you should put a Powerdyne supercharger in, and the idea makes sense. Superchargers attach to the engine and get power from the crankshaft. As they pull air in, they compress it and send it through to the engine, feeding it more air than it could pull in on its own. In turn, this allows the engine to burn more fuel, and to do it more effectively, transferring that increased fuel consumption into raw horsepower. Once you install a Powerdyne BD-11A, or any other compatible model, you begin to see results right away. If your existing supercharger is not holding up to its end of the bargain anymore, you can find the parts you need to get it back to fighting form again.
With the vast inventory on eBay, you can find all the Powerdyne performance parts you need to get your car performing like a champ again.
If it's a really good price, then go for it. It's one of the lower-end (performance wise) of the centrifugal superchargers available. Expect about a 30-35% hike in horsepower. It's a nice entry level unit none the less. Early units had issues with internal belt breakage, so be prepared to stock up on those if he's going to be spinning it at 9psi or above. It's self contained, installation is simple, but oil changes should be done on them about every 12,000-miles, separate from your engine oil change.
Otherwise, it's a decent, low maintenance blower. Powerdyne is not out of business, as a buddy just bought a newly designed impellar from them for my old PD that I sold him. I had a race rebuild done to it by 928motorsports, and with a 7' crank pulley and 2.75 blower pulley on a stock long block it made 12lbs, of boost at 5500 rpms. Before it was rebuilt by 928 the internal belt broke 2x, then I sent it out for the race rebuild and it never failed me again. My buddy now runs the same blower on on his 331 with AFR 165's & E-cam.
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He is running an 8' crank and 2.75 blower pulley. On that motor he makes 12lbs at 5500, but has belt slip issues with the 6 rib belt.
There is another company the he used for his old PD that had good srvice also. Typically it is the internal belt that fails and you can buy the full kevlar belts for 50 bucks online, and change the belt while the blower is still on the motor if your good. The guy with the 331 made like 450rwhp and close to 500 rwtq at Kauffmans Motorsports. This was done pulling the motor no higher than 5500 rpms. I have a very old BD-10 and have had to replace two belts in it in the last five or six years.
Personally I don't think it's that big of a deal. Powerdyne wanted a ridiculous amount of money to rebuild the thing, so I took mine to a local machine shop to pull the bearings. I don't think they charged me more than $40. The top bearing sits right on top of a guide washer for the belt, and the lower bearing is in a blind hole so a regular bearing puller won't work.
Taking the supercharger on and off is like a 15 minute job; just remove the serpentine belt and the 8 or so socket heads. Here's a couple of links to rebuild kit vendors, but you can also find kits on eBay I bought my rebuild kit from a guy on eBay for about $100.
The belt is a proprietary Gates belts so regular HTD belt distributors will not carry the correct size. BD-10 at 6psi, with Performer intake and heads, and TFS-1 cam. Dynoed at 342 hp and 335 tq at only 5500 rpm. Should be a bit over 350hp at 6k rpm.
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