Chevy guy friend wants to know answer to question about our Stage 1's?...

Discussion in 'Sparky's corner' started by Eric, Sep 19, 2018.

  1. Eric

    Eric Founders Club Member

    Why did Buick GS's 455 w/o air use a 37amp alternator and the Stage 1's w/o air used the 55amp? Was there a mechanical reason for this or just a nice upgrade?
     
    Last edited: Sep 19, 2018
  2. pbr400

    pbr400 68GS400

    Because more!
    Patrick
     
  3. Eric

    Eric Founders Club Member

    Because more what...the reason?
     
  4. BUICKRAT

    BUICKRAT Torque Rules!

    Possibly so the alternator could keep up with ignition demand? If'n the headlights are on(big draw), heater fan is on(big draw), and WOT is demanded, a better alt would keep adequate voltage/amperage to the coil, to prevent ignition issues.
     
  5. gstewart

    gstewart Well-Known Member

    probably should even have been a higher amperage to cover the demands as Buickrat suggests.
     
  6. SteeveeDee

    SteeveeDee Orange Acres

    I would expect that the Stage1 would generally be run at higher RPMs. That being the case, maybe GM put a larger pulley on the alternator like they did on Corvettes? I don't know this for a fact, on Buicks. That is one thing I did on any car I hot rodded. There is a fair amount of inertia in an alternator that's spinning north of 20,000 RPM. One gets a little more acceleration if the alternator isn't spinning like a gyroscope. Since it is spinning slower, maybe GM wanted the higher amperage output alternator to make up the difference. [drag racer trick]
     
  7. BuickV8Mike

    BuickV8Mike SD Buick Fan

    20000 rpm?
     
  8. Eric

    Eric Founders Club Member

    Still doesn't answer the initial question?
     
  9. Eric

    Eric Founders Club Member

    Where's Larry the Wizard when you need him or anyone else?
    Eric / Oregon
     
  10. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    I would think a car with PW and seats and other options would get the bigger alternator regardless. Buick’s came “loaded” a lot.
     
  11. Eric

    Eric Founders Club Member

    My GSX is a stage 1 and had no options...except power steering and brakes...but had a 55amp alternator...so my Chevy buddy says they wouldn't put it on the stage 1s unless they had a reason...I told him not necessarily maybe Buick just put it on there for the heck of it! But who knows!?
     
  12. SteeveeDee

    SteeveeDee Orange Acres

    Look at the relative size of the pulleys. If it is a 4:1 ratio (not far off the mark) an engine revved to 5k RPM will spin the alternator at 20k RPM. Go measure some pulleys if you don't believe me.
     
  13. Stage2

    Stage2 Burnouts are fun

    Stage 1 cars all came with heavy duty cooling, which consisted of all of the a/c cooling bits and fuel pump return lines. That's why the Stage 1 alternator, water pump and crank pulley are all dual groove.
     
    1970 STAGE 1 likes this.

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