edelbrock 800 avs / 650 avs carb?

Discussion in 'Engine Topic' started by Riley, Apr 9, 2011.

  1. Riley

    Riley Veteran Member

    Messages:
    132
    Likes Received:
    2
    Joined:
    Oct 3, 2010
    Location:
    Nova Scotia, Canada
    What is the least amount of HP/Torque/Vacuum edelbrock 800 avs carb and the edelbrock 650 avs carb would work ok on? any info woulld be great.
     
  2. dubs74camaro

    dubs74camaro Veteran Member

    Messages:
    707
    Likes Received:
    2
    Joined:
    Mar 19, 2011
    Location:
    Big Block, OR
    Seems like an odd question at first glance. You can easily over-carb just about any motor and it's done ALL THE TIME. What makes you ask the question. Can you give us a little insight on why you are asking? Big difference between any 650 and 800 carb.
     
  3. DoTheDew

    DoTheDew Veteran Member

    Messages:
    899
    Likes Received:
    0
    Joined:
    Mar 2, 2010
    Location:
    Leduc, Alberta
    To many variables on that. Engine size (cubes), VE, etc play a big part. There is no real least amount of HP they would work on. Both would run a 4 cylinder engine that produced 40hp if you wanted them to, but probably not very well. 650, you're good up to around 350-400 hp if calibrated correctly. the 800, over 450-500. You could still make the 800 run on a 200 horse 305 if you wanted, but it'll never preform the way a 650 would, if you get what I'm saying.
     
  4. 76z28

    76z28 Veteran Member

    Messages:
    2,384
    Likes Received:
    180
    Joined:
    Jun 29, 2009
    Location:
    bakersfield
    Since its an avs you could use either one I got the 800 for my set up
     
  5. NYH1

    NYH1 Veteran Member

    Messages:
    1,604
    Likes Received:
    12
    Joined:
    Feb 27, 2010
    Location:
    Central New Yorkistan
    Cubic inch x max RPM ÷ 3456 = required CFM @ 100% volumetric efficiency.

    Example- 350 CI x 6000 max RPM = 2100000 ÷ 3456 = 608 CFM @ 100 VE.

    Keep in mind that most street built engines are usually 85% to 90% VE or so at best. So if you put x .85 or .90 at the end of the above formula, you really only need a 517 to 547 CFM carb. A little more won't hurt. Going to much more then is actually required can hurt. Carbs are like cams, you're better off being a little to small then to big.

    HERE is a good calculator.
     
  6. 1BAD78

    1BAD78 Veteran Member Gold Member

    Messages:
    814
    Likes Received:
    0
    Joined:
    Apr 12, 2007
    Location:
    Broken Arrow Ok
    That makes no sence. How did you come up with that?
     
  7. 76z28

    76z28 Veteran Member

    Messages:
    2,384
    Likes Received:
    180
    Joined:
    Jun 29, 2009
    Location:
    bakersfield
    AVS---AIR VALVE SECONDARIES

    It has a spring operated door you can adjust basically to the cars needs which is to allow it to only draw in as much air as it needs
    LEMME GUESS my car is over carbed but thats funny i had a 650 on there and i gained 5mph in the quarter...
     
    Last edited: Apr 12, 2011
  8. 1BAD78

    1BAD78 Veteran Member Gold Member

    Messages:
    814
    Likes Received:
    0
    Joined:
    Apr 12, 2007
    Location:
    Broken Arrow Ok
    Wrong dude the AVS means Ajustable valve secondary which allows you to change the secondarys opening rate. So what that means is you turn the adjustment screw to speed up or slow down the secondarys opening rate. so your adjusting basically at what point the secondarys open.
     
  9. Led Zep

    Led Zep Veteran Member

    Messages:
    575
    Likes Received:
    33
    Joined:
    Mar 13, 2008
    Location:
    Ky
    At the very least, get a 750 VS carb.The Quadrajet was rated at 750 CFM and put on many a smogger motor with a cork called a CAT.Did they run rich?Of course not.The MYTH OF TOO BIG A CARB,came from people putting double pumpers on every engine thinking they had the performance edge.

    A 600 CFM VS is a joke.Anyone telling you otherwise has no REAL world experience on a dyno or at the track.
     
  10. dubs74camaro

    dubs74camaro Veteran Member

    Messages:
    707
    Likes Received:
    2
    Joined:
    Mar 19, 2011
    Location:
    Big Block, OR
    Wait a minute.....you know NOTHING about this guy's motor combo and you are telling him to get at least a 750 VS???????

    For one thing the conversation is not about Q-jets and why on Earth would Carter (in the past), Edelbrock, Barry Grant and Holley (among others) even make a carb smaller than 750 cfm if it is just not needed???? If you think "over carbing" is a myth, you obviouisly have no dyno or track time yourself. Just saying........

    Dub
    HP Carburetors
    http://feedback.ebay.com/ebaymotors...edback2&userid=hpcarburetors&ftab=AllFeedback
     

Share This Page