need help

1964f100240

Well-known member
im going to run a paxton sn60 on a 240 how do i figure out what pulleys to run i want 15lb at 6500rpm the paxton is 3.50.1 ratio thanks billy.
 
It is more about keeping the impeller speed below max rpm.
If the max impeller speed is 38,000 rpm? and the engine rpm limit is 6500 rpm
38000/(6500 X 4.4) = a pulley drive ratio of 1.33

That is the most the supercharger will do and will be under 15lbs of pressure.

The friction ball drive was designed to operate at 7 lbs and it is not recommended running it at pressure levels much beyond.

Head porting and larger cam will increase engine VE at higher rpm which will lower supercharger pressure.
 
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