Stock, JDM, PSP, Metco, & JL Lower Pulley RPM Comparo!

BfB

Banned
Joined
Jun 2, 2001
Messages
53
Location
Mobile, AL
I previously posted on here and F150Online.com w/ some #'s. They are wrong and I will update them in the old threads as well to keep from confusing people.

As you can see, Metco (www.metco-inc.com) now offers a true 8.0" lower pulley. Sal's is really a true 7.9", and JDM's is a true 7.8" (as always published).


Code:
                                                     3#        4#        5#        6#
Pulleys:  STK(7.4)  JDM(7.8)  PSP(7.9)  METCO(8)  JL(8.17)  JL(8.94)  JL(9.71)  JL(10.48)
Price  :              $239      $240      $249      $260        ?         ?         ?

ENG.                                       Blower RPMs
RPMS    
5000   -   12645     13329     13500     13671     13396     15277     16593     17908
5100   -   12898     13595     13770     13944     14240     15582     16924     18267
5200   -   13151     13862     14040     14217     14519     15888     17256     18625
5300   -   13404     14129     14310     14491     14799     16193     17588     18983
5400   -   13657     14395     14580     14764     15078     16499     17920     19341
5500   -   13910     14662     14850     15038     15357     16805     18252     19699
5600   -   14162     14928     15120     15311     15636     17110     18584     20057
5700   -   13404     15195     15390     15584     15916     17416     18916     20416
5800   -   13657     15461     15660     15858     16195     17721     19247     20774
5900   -   13910     15728     15930     16131     16474     18027     19579     21132
6000   -   14162     15995     16200     16405     16753     18332     19911     21490

Okay, here's what I went and did. I took JL's #'s he sent me in email and figured in he was over calculating the stock pulley by .054 because 2 people now have measured the stock pulley as 7.400 (JDM) and 7.401 (Bad as L).

I then just said 7.4 for factory since it is so close (.001) to make it an average point to work with. Since Bad as L states he measured Sal's pulley EXACTLY .5 larger to 7.901 I figured it as 7.9, again since it's so close. JDM states EXACTLY .4 larger to 7.8 (and he measured 7.400 and 7.800). Johnny is getting a larger # for stock somehow (gauge is off I assume, but maybe not), so I just downsized the rest of his pulley #'s by taking the difference between his stock pulley measurement and Bad as L's, and then subtracting from JL's published #'s.

I may update this depending on what new info. I receive, but for now it's very close.

FWIW, here is JL's email to me:

stock 7.455 .092 over gauge balls
3#- 8.227 .092 over gauge balls
4#- 8.99 .092 over gauge balls
5#- 9.762 .092 over gauge balls
6# 10.534 .092 over gauge balls

You can also find a similar discussion here:

http://www.f150online.com/forums/showthread.php?s=&postid=408646

BfB
 
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