PSI b,c,d ID

Discussion in 'Manton Push Rods Top Alcohol Tech Questions' started by overkill69, Nov 20, 2010.

  1. overkill69

    overkill69 Member

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    Anybody know how to tell a B C or D rotor apart by looking at them? Looking at one with no numbers on it. What year was the C rotor started? Did they make any other models?
    Thanks Mike
     
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  2. fed-west

    fed-west Member

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    Do a search and there is a thread in the archives where Roger from PSI answered some of the questions you are asking. Here is part of what he said. I do know on the early models there is no gap in the front of the blower to the rotors. That would be all 200 series and the B series for gas.

    There has been a few questions about how a PSI "C" and "D" compare so here it is in overdrive a "D" at 125% would be approximately the same as a "C" at 104% so just over 10% 2.25/2.04 = 1.102 - 1 = 10.2%

    The last question that comes to mind is how to tell the difference between a "D" and a "C" measure the female or driven rotor lobe thickness, there are small variation based on application and date of manufacture or customers specific needs but on average a "C" will measure .483-.485 a "D" will measure .594-.596 both blowers have a open port in the housing between the front shaft/bearing supports.
     
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  3. overkill69

    overkill69 Member

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    psi

    Thanks, that covers it.
     
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  4. tommyt

    tommyt New Member

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    How would the old 200 series rate in performance compared to the 206 series ?
     
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  5. Patrick Hale

    Patrick Hale Member

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    PSI and Whipple CID/Rev

    The pumping displacement (in cubic inches per revolution) for the Screw blowers is about:

    PSI 200-A = 385 cid/rev (200 mm diameter of the male rotor)
    PSI 206-B = 422 cid/rev
    PSI 210-C = 476 cid/rev
    PSI 206-D = 422 cid/rev

    Whipple A980 = 601 cid/rev (9.80 liters per rev)
    Whipple R980 = 601 cid/rev
    Whipple 305R = 305 cid/rev

    By way of comparison, a 14-71 Roots = 551 cid/rev

    Patrick Hale
    www.DragRacingPro.com
     
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  6. rb0804

    rb0804 Member

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    What is the difference between the B and the D series if they both have the same amount of cid/rev? Are the placement of the hat nozzles different?
     
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  7. Patrick Hale

    Patrick Hale Member

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    The PSI 206-B supercharger is intended for gasoline fueled applications, primarily marine. So it is designed to operate in a much hotter enviroment for longer periods of time than 5 second methanol drag racing engines. The PSI 206-B is also not SFI certified.

    Patrick Hale
    www.DragRacingPro.com
     
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  8. tommyt

    tommyt New Member

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    I have a PSI 200A...what overdrive should I use to get around 30psi on a conventional headed BBC 540 at 8000rpm ? Can this blower provide the air needed to make this boost ? Not much info out there on the 200A...too old and outdated I guess.
     
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  9. tommyt

    tommyt New Member

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    125% over ? Do I dare spin this blower faster ?
     
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  10. jwoc200

    jwoc200 New Member

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    so i run a top alcohol hydro i have a d rotor on it would i get the same peformance out of it if i bought a b as a backup blower?
    thanks
    james
    p.s what about a 200 c blower
     
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  11. rb0804

    rb0804 Member

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    Call out to PSI and talk to Roger or Norm. They should be able to get you pointed in the right direction.
     
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  12. shawn davis

    shawn davis Member

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    not sure if the rotors are the same, I know the front opening is not as open (large) on a B as a D- in front of the rotors.
    no burst panel on a B either but appears you could open it up for one
     
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