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Thread: installed afr gauge

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    VCVC Member jrinaman's Avatar
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    installed afr gauge

    my throttle response was never as crisp as I had wanted, and knew it was on the rich side. I bought an afr gauge and installed it and found my air fuel ratio is 9.8 at idle and NEVER goes above 11! I have dual weber/carter 32-32 2 barrels and replacement jets are obsolete so new carbs are next on my list. this involves different adapters, linkage and modifying the air filter, then I can order jets as needed.
    '64 chevy, 292 40 over, 206/526 cam, 2004r trans. 9.75:1, dual webbers, Langdon cast headers, 1.94 valves

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    Van Addict Daves 68's Avatar
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    14.7 at Idle is what you are looking for,,9s is very rich
    12.6 at full throttle is optimum,,,,,13 is a little lean but doable
    Dont tell me I cant do it

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    Van Addict SteelyVan's Avatar
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    What kind of set-up are you changing to? I'm surprised too that you can't get jets.
    Last edited by SteelyVan; 05-19-2017 at 07:03 PM.

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    VCVC Member jrinaman's Avatar
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    probably weber 38/38's but looking at 32/36's also. I looked into this a year ago and cliffords says the 38's would be best for my combination. the 32/36 has the advantage of running on just the 32's at idle/part throttle and 36 coming in at half throttle. the 38's run both from idle. not concerned about fuel economy but over carbed kills throttle response. the 32/32's are from langdons and he was surprised I had an issue as he sold a lot for our sixes. they are new carbs leftover from years ago, originally on the pinto.
    '64 chevy, 292 40 over, 206/526 cam, 2004r trans. 9.75:1, dual webbers, Langdon cast headers, 1.94 valves

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    VCVC Member TurboVan's Avatar
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    So you're saying neither Holley nor Q-jet nor Edelbrock nor Weber jets fit Pinto carbs? That's odd...

    You don't have to change jets, you can put different sized wire pieces thru thru the jets to adjust the flow, and bend the ends so the wires don't move. That's how I dialed-in my non-changeable power valve orifices. Start small and creep up on the right mixture, all that matters is STEADY STATE readings under various steady throttle positions, not momentary readings.
    You could also make your own jets out of brass screws, if you know the proper thread.
    Last edited by TurboVan; 05-20-2017 at 03:33 AM.
    Keep one foot in the gutter, one fist in the gold...

    '65 Panel, with turbocharged 327 (originally 153 four), TH400 (originally 3-speed), and 3.31 '67 Camaro 12 bolt rear (my first car, 1970)
    https://www.youtube.com/playlist?lis...meE_Jf-hgJU2mG

    '69 Sportvan 108 with turbocharged original 250 six and 700R4 (originally Powerglide), 3.73 rear, starred in eight Taco Bell commercials
    https://www.youtube.com/watch?v=kDfPJ3xmwjY

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    VCVC Member lvjjj's Avatar
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    I run the 38/38 on my 292 and the response is excellent, quick and all that gas is needed to juice the big block 6. Certainly is not overcarbed.
    LARRY OF THE PACIFIC NW
    1965, 292, TH350
    purchased Nov. 22, 1970

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    VCVC Member jrinaman's Avatar
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    they don't look like typical jets. they look similar to this but those jets/emulsion tubes are similar, not identical and are $29.95 EACH! mine are weber dft's. one jet has a hole all the way threw and the other comes up from the bottom and out the sides only.
    '64 chevy, 292 40 over, 206/526 cam, 2004r trans. 9.75:1, dual webbers, Langdon cast headers, 1.94 valves

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    VCVC Member jrinaman's Avatar
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    Quote Originally Posted by lvjjj View Post
    I run the 38/38 on my 292 and the response is excellent, quick and all that gas is needed to juice the big block 6. Certainly is not overcarbed.
    I am running dual carbs. my current carbs flow around 330 cfm. dual 32/36 will flow 380 cfm which is adequate and 38's around 460 cfm. I could easily use that at 6000 rpm's but rarely see that. more concerned with idle to 3500.
    '64 chevy, 292 40 over, 206/526 cam, 2004r trans. 9.75:1, dual webbers, Langdon cast headers, 1.94 valves

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