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I have a 12jc and am building a 650hp and 675lbs apox.....and wondering what impeller to use to get 70+
 

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E-7 Sheepdog (ret)
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I have a 12jc and am building a 650hp and 675lbs apox.....and wondering what impeller to use to get 70+
Well, to start, with that HP, I would go A or AA cut, you are closing on 6,000RPM with an A Berk.

You can ALWAYS cut it smaller for very little $$$$.

Making it grow bigger, a bit harder. :D

Once you get a setup to work from, then the adjusting starts with the shoes, droops or snoots, nozzle bushings, rideplate angles, diverter, etc, etc. Seems endless, and the posibilities are I suppose. ;)

What is the RPM you make 650HP at? VERY important. :)bulb

An A is no good if you don't make that untill 7,000RPM, because you'll NEVER get there. A "D" cut maybe.

Guy on another board had a 502 dynoing 718HP @7-grand
Put a Berk A cut behind it, made 4,000RPM, MAX, due to the way the power development was.
My 350HP 454 spun same impeller 4,800RPM.
 
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