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  1. #91
    Do you ever leave? HQ308Ute's Avatar
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    check out the throttle area with Webers

  2. #92
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    Hi
    Actrol
    I suggest u reread. Its more about single carb and how closely there performances overlap of 2 similar design single carb manifolds . There is 2 opposing outcomes
    I repeat
    A single plain by design will never fill the cylinders at lower rpms the same as a DP. Close but not the same .
    A dual /P will fill the cylinders early but its design will limit it at the top end .

    The reason why the MODERN DP canbe close to entry level SP . The runners are getting straighter and higher in the DP. The single plain is only limited when its design is for under bonnet use .Many of the entry level SP are a very old design .


    1x barrel /cyl eg quad webers or 1x injector eg port FI typically makes good power but not always over a wide rpm range .
    Last edited by swampy; 01-02-2019 at 05:23 PM.

  3. #93
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    Your thoughts around length , approach angle, volume and don’t forget temperature gradients are only part of the problem
    Dual planes are a band aid
    Simples

  4. #94
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    Swampy,
    Gave an example of Webers v 4bbl in post #59. About 45ft/bs higher across the rev range...

  5. #95
    Do you ever leave? HQ308Ute's Avatar
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    well the bloke's already settled on a performer so it's all good anyway

  6. #96
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    What is an entry level single plane and where are the quick/fast dual plane cars?

  7. #97
    427
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    Hi mate. Sounds like you are thinking of about 410 cubes. Go for it! ****in heaps of grunt. 400's rule. Fire it up 👍

  8. #98
    427
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    I remember going for a ride in a mates 400 chev. Maybe a little down on comp. Had a nice Edelbrock dual pattern cam.
    Even wirh 3.08 gears it was a nice ride.
    HX sedan.

  9. #99
    427
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    Pulled like a mother....

  10. #100
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    Quote Originally Posted by guy incognito View Post
    What is an entry level single plane and where are the quick/fast dual plane cars?
    My top gun low rise procomp single!! Fully sik!!


    Sent from my iPhone using Tapatalk

  11. #101
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    Matched to my procomp aloominum heads with Manley and comp cams goodness.


    Sent from my iPhone using Tapatalk

  12. #102
    427
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    As long as the air moves ☺

  13. #103
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    hi
    My 400 chev will suck very well thru a dual plane oh yea under the bonnet. The comparable single plain which fits under the bonnet does poorly by comparison . SIMPLES

    For those of u who don't no the rpm series is slot later design than the vic jr
    The vic jr offers little to no advantage over the rpm air gap

    Was I ever talking about a MPI or quads for the red head 355 or my chev 400 NO..finished
    The 355 is a mild replacement engine
    The Performer also fits under a bonnet .
    Not the best performance choice but is cost effective

    I deal in reality where I cruise at 100kph either 2900 or 2200 with a 2800 stall . Kicks down to 2nd goes to 4500rpm and hold on. ALL the way to just under 6500 limit . see ya

    At 60kph kicks down 1st 4000rpm or 2nd goes to 2800 and the party starts like a rocket

    All the way to 6500... Whole lotta fun all thru out the rev range

    People can say this , say that , don't care it works for me..


    Jeez might even try a D/P on some .650 lift 340cfm 220cc heads next .
    Last edited by swampy; 02-02-2019 at 01:42 AM.

  14. #104
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    Quote Originally Posted by swampy View Post
    Hi Paul
    I agree the better the heads the lesser duration needed. But
    Camshaft matching inlet manifold is on show .An airgap gives a better signal to carb via length and size of runners for better cylinder filling at xxx rpm . Starts with a huge surge at say 2000-2500
    In a single plain I suspect there is only a small chance with a bigger cam a s/p would improve surging volume of cylinder filling at low to mid rpm levels .
    Only if the perfect cam was selected for a single would it work . =a lot off dyno type with unlimited cams


    We are only talking about this, why because the Dual plains are catching up with the entry level single plains . The DP are almost copying the SP design eg raised runner and increasing plenum volume .
    Raises 2 questions
    1/If the victor Jr were redesigned would they be better again ???
    2/ If a dual plain for a chev was designed for a 400 chev it would be a single plain KILLER
    Forget about the perfect cam, if you want the same TQ output at lower RPM with a single plane then you decrease duration and maybe put a touch more lift..
    1/ They did redesign it, its called the Super Victor, then they redesigned that and called it Super Victor 2
    2/ Maybe at 2000-2500RPM, maybe 5000 who cares unless its a tow truck...

  15. #105
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    Quote Originally Posted by swampy View Post
    hi
    My 400 chev will suck very well thru a dual plane oh yea under the bonnet. The comparable single plain which fits under the bonnet does poorly by comparison . SIMPLES

    For those of u who don't no the rpm series is slot later design than the vic jr
    The vic jr offers little to no advantage over the rpm air gap

    Was I ever talking about a MPI or quads for the red head 355 or my chev 400 NO..finished
    The 355 is a mild replacement engine
    The Performer also fits under a bonnet .
    Not the best performance choice but is cost effective

    I deal in reality where I cruise at 100kph either 2900 or 2200 with a 2800 stall . Kicks down to 2nd goes to 4500rpm and hold on. ALL the way to just under 6500 limit . see ya

    At 60kph kicks down 1st 4000rpm or 2nd goes to 2800 and the party starts like a rocket

    All the way to 6500... Whole lotta fun all thru out the rev range

    People can say this , say that , don't care it works for me..


    Jeez might even try a D/P on some .650 lift 340cfm 220cc heads next .
    When funds drive options reality gets skewed
    Simples

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