Carb cfm

Discussion in '1947-1954' started by ropo355, Oct 29, 2010.

  1. ropo355

    ropo355 Member

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    Hello everyone, I been looking into replacing my Rochester B carb, possble with dual Carters, which I know will be a good thing. My issues are I live in Denver, CO. 5280 ft above sea level. Will 2, 235 carbs be to much for it. I will have to rejet them for allitude, possible get rods and jets made. Would 2,216 carbs work better... aka better throttle response. I've worked on a set of dual Rochesters up here and they had a small throat size than my single 235 carb did. Just thinking out loud. Thanks Ron
     
  2. ropo355

    ropo355 Member

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    Or maybe I'm just over thinking this?
     
  3. Blueflame236

    Blueflame236 Member

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    carburator issue

    Hmmm intresting topic , quite high up you live.


    Its the thinner and colder air that makes the difference from regular standards right. I would try to use a paper airfilter instead of the oilbath type.
    In generall ; you probably know that cold weather can cause your car to require a little more gas. There are a lot of reasons for this. The biggest is that cold temperatures cause gasoline to thicken. That makes it difficult for the gas to combine with the intake air and provide the proper air-fuel mixture that an internal combustion engine needs. Not only is it harder to generate the correct mix, but it's also a little less powerful when the gas is cold. That means you end up using more gas to do less work. A mixture of fuel and Isapropanol makes the fuel less thicken and keeps the water out , means in the bottem of your fueltank. I ad Isopropanol to the cars and tractors fuel. Gas or diesel does `nt make any difference. Not shore if you have a product like that in Colorado ?

    Changing to Carter YF with autochoke could also give a posseble solution? The carb has a stove mount possebillety between the dashpot and exhaust manifold wich warms up the fuel before it is transported further into the carb.

    Resumè from the "carb docter" ; Carter YF with a slow throttle closing dashpot. Dashpots were used to prevent stalling when the gas pedal is suddenly released when braking (on automatic transmission cars), to improve shifting on manual transmission vehicles, and, in later models, to control emissions. When the throttle is closed quickly, the mixture can become too rich because of the high vacuum under the throttle plate. In this case, the dashpot served to slow the closing of the throttle plate, decreasing emisions.


    Ask the older guys in Denver how they solved this altitude level difference in the older days.

    Maybe you could contact the "carburater docter" wich has a link in Canada .
    Web link ; http://www.carburetor.ca/



    Here in the mountains areas in Norway they use to warm up the cooling system installing a el.plug in the engine-block using an elemnt conversion from 220 to 12 volts before starting the engine. ( known as a DEFA block heather).
    Indirectly the cars oil down in the carter also gets warmer an is therefore easyer to start.

    http://www.defa.com/heating.php3?lang=3&ndid=&aid=&tid=#

    My truck has the 235 engine with a single setup carter YF carb with dashpot choke. My experiences are so fare very good. I have allready planned (on the longterm) to upgrade the system with dual carb setup . My farm is located at 1100 m. above the sealevel.

    1 ft = 0,305 meter
    CO. 5280 ft = 1609.34 m above sealevel

    Good luck Martinius. , singing Rocky mountain high Colorado (John Denver).
    http://www.youtube.com/watch?v=EZiL1PMF3xA
     
    Last edited: Oct 30, 2010
  4. Kens 50 PU

    Kens 50 PU Member

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