Free 173 Best Homemade Tools eBook:  
Become a founding member: 500+ tool plans, full site access, and more.

User Tag List

Results 1 to 6 of 6

Thread: 1959 Plymouth Atomic Punk Bubbletop - photo

  1. #1
    Content Editor
    Supporting Member
    Altair's Avatar
    Join Date
    Aug 2013
    Posts
    3,732
    Thanks
    838
    Thanked 9,142 Times in 2,694 Posts

    1959 Plymouth Atomic Punk Bubbletop - photo


    173 Best Homemade Tools eBook

  2. The Following 3 Users Say Thank You to Altair For This Useful Post:

    baja (Mar 11, 2020), clydeman (Mar 14, 2020), MIGuy (Mar 10, 2020)

  3. #2
    Supporting Member Frank S's Avatar
    Join Date
    Aug 2015
    Location
    Peacock TX
    Posts
    6,673
    Thanks
    838
    Thanked 5,261 Times in 2,525 Posts

    Frank S's Tools
    looks to have 8 2 bbl carbs that would be a bugger to jet properly so the engine could idle in order to make it street reliable. they would absolutely have to be flow bench match tuned I like that custom fabricated 10 or 12 inch rise deep plenum tube manifold sitting on top of the Hemi though
    Never try to tell me it can't be done
    When I have to paint I use http://kbs.justoldtrucks.com/

  4. #3

    Join Date
    Oct 2012
    Location
    Erie, PA
    Posts
    103
    Thanks
    261
    Thanked 35 Times in 26 Posts
    Looks like something George Barris would have cranked out. I remember making some cool model cars back in the 60's!

  5. #4

    Join Date
    Jul 2019
    Posts
    85
    Thanks
    29
    Thanked 14 Times in 10 Posts
    Quote Originally Posted by Frank S View Post
    looks to have 8 2 bbl carbs that would be a bugger to jet properly so the engine could idle in order to make it street reliable. they would absolutely have to be flow bench match tuned I like that custom fabricated 10 or 12 inch rise deep plenum tube manifold sitting on top of the Hemi though
    I would disagree with you Ken. Those carbs are in a common plenum so it is only the total outcome of the plenum that must be in tune with the engine. Depending on how the plenum is designed with baffles, each carb does not have to be in the same AFR as another.

  6. #5
    Supporting Member Frank S's Avatar
    Join Date
    Aug 2015
    Location
    Peacock TX
    Posts
    6,673
    Thanks
    838
    Thanked 5,261 Times in 2,525 Posts

    Frank S's Tools
    Quote Originally Posted by Wildwilly View Post
    I would disagree with you Ken. Those carbs are in a common plenum so it is only the total outcome of the plenum that must be in tune with the engine. Depending on how the plenum is designed with baffles, each carb does not have to be in the same AFR as another.
    While admittedly they would not be as critical as a set up on 8 separate down tubes without a conjoined single or duel level plenum chamber, but just like a 6 pack set up on a Plymouth road runner let 1 or more of those vacuum spray boxes have differing air fuel ratio settings or a throttle plate open more or less than the others and the performance of the engine is going down the tubes either rough or surging idle the torque curve gets thrown off and HP rise at high RPMs floats
    With 8 carbs one would be positioned over each tube leading down from the plenum even thought eh chamber would be common for all of them the one closest to any given tube is going to spray down that tube more than it will mix with the others in the plenum. The 1 advantage of the large plenum chamber is there would be a balanced vacuum through out though the atomized fuel would largely be gravity driven when a given intake valve was open. the rapid opening and closing of the intake valves creates a negative and zero pressure pulsation
    A v8 engine with a 3 duce set up will actually run better on 2 carbs than it will if 1 of the 3 is over or under fueling or has an early or late throttle response setting I would think this may even be compounded with 8 carbs.
    Of course just like a duel quad or a 3 duce the 8 duce could take advantage of having progressive throttles and idle on 2 or 4 then run on 4 to 8 and power on the 8 secondary's
    Never try to tell me it can't be done
    When I have to paint I use http://kbs.justoldtrucks.com/

  7. #6
    Supporting Member IntheGroove's Avatar
    Join Date
    May 2019
    Location
    Lake Tahoe
    Posts
    799
    Thanks
    72
    Thanked 357 Times in 212 Posts

    IntheGroove's Tools
    Looks like something Ed Roth could have built...



    173 Best Homemade Tools eBook

  8. The Following User Says Thank You to IntheGroove For This Useful Post:

    harleyron74 (Mar 12, 2020)

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •