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Thread: 505 Carby

  1. #1
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    Icon5 505 Carby

    Hi there,

    I currently have a 32/36 weber on my gr505 and I feel it just hasnt got enough power, and I was wondering if a 40mm weber would bolt straight on to my manifold. would a 40mm weber give me much more power ? what would one cost ?

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    cheers.

  2. #2
    Guru davemcbean's Avatar
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    If you're lucky enough to find a Weber 40DFA or 40DFAV, then they bolt straight on (but you'll need to file out the manifold to match the throats). The Weber 38DGAS is more common (but still pretty rare) and you can buy them new for about $600 (big bucks). Alternatively you could fit a two barrel 350cfm Holley (which has 38mm throats), but make sure it has a replaceable jet kit fitted to the power valve, otherwise it will run too rich. You also need an adpator plate (available from Redline at most local parts stores) to mount the Holley on the Weber/Solex bolt pattern.

    Of course, there's not alot of point using these carbys if you're still running the standard camshaft.

    The Wade 112 cam is a good camshaft for a single carby road car. It gives as much low down torque (if not more) as standard, plus they rev better and smoother and the economy is excellent.

    Dave
    Last edited by davemcbean; 19th August 2004 at 11:25 AM.
    NZ Fleet
    1976 504 Ti
    1984 205 GT twin carb
    1991 205 SI 1.6GTI motor
    1994 106 Xsi
    1996 Mondeo V6
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  3. #3
    Guru davemcbean's Avatar
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    Have you checked out my website? There's a bit more info about camshafts, etc, on there:

    http://www.geocities.com/davemcbean/...l?997061496590
    NZ Fleet
    1976 504 Ti
    1984 205 GT twin carb
    1991 205 SI 1.6GTI motor
    1994 106 Xsi
    1996 Mondeo V6
    Aus Fleet
    1955 203C
    1997 Civic Cxi (great allrounder- revy, flexible, nimble, comfortable , economical, simple and durable )

  4. #4
    Member
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    Quote Originally Posted by davemcbean
    If you're lucky enough to find a Weber 40DFA or 40DFAV, then they bolt straight on (but you'll need to file out the manifold to match the throats). The Weber 38DGAS is more common (but still pretty rare) and you can buy them new for about $600 (big bucks). Alternatively you could fit a two barrel 350cfm Holley (which has 38mm throats), but make sure it has a replaceable jet kit fitted to the power valve, otherwise it will run too rich. You also need an adpator plate (available from Redline at most local parts stores) to mount the Holley on the Weber/Solex bolt pattern.

    Of course, there's not alot of point using these carbys if you're still running the standard camshaft.

    The Wade 112 cam is a good camshaft for a single carby road car. It gives as much low down torque (if not more) as standard, plus they rev better and smoother and the economy is excellent.

    Dave
    I just found a 40DFA advertised for $200 in excellent condition second hand. is that a good price ?

  5. #5
    Guru davemcbean's Avatar
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    Quote Originally Posted by PuGmAn
    I just found a 40DFA advertised for $200 in excellent condition second hand. is that a good price ?
    Yes, but before you buy it, let me check if that model has a power valve (I have a book on Webers at home). If not, it's probably not a good one to use (economy wise). I'll get back to you on this by tommorrow morning.

    Dave
    NZ Fleet
    1976 504 Ti
    1984 205 GT twin carb
    1991 205 SI 1.6GTI motor
    1994 106 Xsi
    1996 Mondeo V6
    Aus Fleet
    1955 203C
    1997 Civic Cxi (great allrounder- revy, flexible, nimble, comfortable , economical, simple and durable )

  6. #6
    Guru davemcbean's Avatar
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    Oops! I nearly stuffed up. The DFAV has a power valve, but it seems the DFA doesn't (the "V" stands for valve). It may be hard to tune the 40DFA for single carby application (like the 505), because of this.

    It may give you 5 extra hp at the top end compared with your current carby, but you would probably sacrifice drivability and economy in a big way.

    Dave
    NZ Fleet
    1976 504 Ti
    1984 205 GT twin carb
    1991 205 SI 1.6GTI motor
    1994 106 Xsi
    1996 Mondeo V6
    Aus Fleet
    1955 203C
    1997 Civic Cxi (great allrounder- revy, flexible, nimble, comfortable , economical, simple and durable )

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