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  • blower RPM question

    is there a way to figure out your blower rpm? based on engine rpm and pulley size?? i know the s/c is rated to 16,000 continuous rpm, but i have no idea where that limit is. just wondering because i plan to have a pretty small pulley on a high-revving engine by the end of next winter. 2.7" pulley at 7000-7500 rpm... is that gonna blow something up? lol
    -Kevin<br /><br />&quot;Ha ha HA! Mine is an evil laugh...now die!&quot;<br /><br />

  • #2
    What is the diamater of the crank pulley?
    -2002 Saturn SC2 - Clean, slow, low daily
    -2008 Saab 9-7x Aero
    -1996 Suzuki Bandit 750 swapped
    -1998 VW Golf GTI VR6 Mid Engine LeMons car
    -1986 RX7 - 275whp @ 10psi

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    • #3
      idk...gotta llok it up
      -Kevin<br /><br />&quot;Ha ha HA! Mine is an evil laugh...now die!&quot;<br /><br />

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      • #4
        do it. and then I'll use my maths for you. lololol
        -2002 Saturn SC2 - Clean, slow, low daily
        -2008 Saab 9-7x Aero
        -1996 Suzuki Bandit 750 swapped
        -1998 VW Golf GTI VR6 Mid Engine LeMons car
        -1986 RX7 - 275whp @ 10psi

        Comment


        • #5
          drive pulley diameter divided by driven pulley diameter (crank divided by S/C) gives you drive ratio. engine RPM times drive ratio = supercharger RPM if its a roots blower. centrifugals have an internal drive ratio which you need to take into account.


          Always do sober what you said you'd do drunk. That will teach you to keep your mouth shut. -Ernest Hemingway

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          • #6
            ion redline, so it's Roots. spent a couple hours searching das intraweb... couldn't find it. not i gots to go to werk. will try again later
            -Kevin<br /><br />&quot;Ha ha HA! Mine is an evil laugh...now die!&quot;<br /><br />

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            • #7
              shit I just did a bunch of these equations for Track Slut and Redline13, let me see if I can find them.
              -Vinny

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              • #8
                -Vinny

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                • #9
                  ok I'm going to put up the math for 7200rpm engine speed. thats where we have most of the redlines here tuned for since they can hold 3rd gear as it comes through the traps:

                  3.0" = 15,120
                  2.9" = 15,641
                  2.8" = 16,200
                  2.7" = 16,800
                  2.6" = 17,446

                  the Stage 2 pulley is 3.01" roughly

                  on this generation Eaton, 16,000rpm blower speed continuously, so for short bursts the 2.7 will be alright, such as during a track run.

                  food for thought: GM made 300whp on an LSJ with the 2.87" pulley, so a 2.8" with a solid tune and proper supporting mods should be fine. consider colder plugs too, they can literally save you a cracked piston.

                  right now we're running I think a 2.9 or 2.8 on Track Slut's car and just put a new header with catless 3" downpipe, and the rest of the exhaust is on its way in soon (3" mandrel). with a retune it should be close to the 300whp mark, and if it's not the 3" will flow enough for the nitrous we're thinking of putting on it [img]{SMILIES_PATH}/icon_twisted.gif[/img]
                  -Vinny

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                  • #10
                    now that is some good info

                    and taesty too

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                    • #11
                      that's awesome Vin! now that you posted it, i remember seeing that before. works out perfect too, cause i have a 2.7" pulley just waiting for injectors and a tune!!
                      -Kevin<br /><br />&quot;Ha ha HA! Mine is an evil laugh...now die!&quot;<br /><br />

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