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Thread: carb or timing
          
   
   

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  1. #1
    383 chev's Avatar
    383 chev is offline CHR Member Visit my Photo Gallery
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    carb or timing

     



    Hey everyone!!!
    I have 850 Q-jet edelbrock #1910 suppose to be calibrated 4 engines 500+ hp i am probably far from that. its a 406 rotating assembly 10.5 to 1 compression dart iron eagle heads 2.08 intake valves 230 cc runners 72 cc chambers cam is a comp roller extreme with intake 230 duration @ .050 236 exhaust @ .050 msd 6AL box limiter set at 6000. I think my timing is set at 20 dergrees base timing. I set it at idle 900 rpms with 20 deg. is this ok. Denny had a article from hot rod mag. or somthing that he posted about timing. Now for my prob. steady speeds it misses
    foot in it, it clears up now when i take the load off and put in nuetral and rev it to 2000 rpm and hold it, it will start missing again and if i hold there it will continue to miss drop to about idle speed with that miss let of and it idles fine no miss or nothing.
    When i mess with timing nothing changes.


    confused

    Bryon

  2. #2
    autocityman4 is offline CHR Member Visit my Photo Gallery
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    how old is this engine?(since rebuilt)

  3. #3
    Ives Bradley's Avatar
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    cap and rotor-plugs and wires, fuel quality?
    Choose your battles well===If it dont go chrome it

  4. #4
    383 chev's Avatar
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    the engine has 30 miles on it maybe if that!!
    the cap rotor and wires are all brand new premium fuel
    filled this year!!!!
    No O2 sensor
    One other thing i put smaller jets in this carb and it got worse
    hahaha maybe i should try going with bigger jets
    sorry forgot to mention that but i just assume that the carb is too much anyway!!!

  5. #5
    autocityman4 is offline CHR Member Visit my Photo Gallery
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    yeah it looks like its the carb..........did you build the engine ?thanks

  6. #6
    383 chev's Avatar
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    no morris racing engines built it i just put intake, carb,
    and distributor in it fired rite up after install but that damn
    miss last motor it was there with a cruising.----puh----

  7. #7
    Ives Bradley's Avatar
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    Just for kicks pull one of the rear plugs to check for gas soak. I aalso have a feeling the carb is too big for cruising.
    Choose your battles well===If it dont go chrome it

  8. #8
    383 chev's Avatar
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    i left specs in first post its a intake is 230 @ .050 exhaust 236 @ .050 int. .510 exh. .520 centerline is 106
    lobe seperation 110 its also a roller setup if that helps

  9. #9
    autocityman4 is offline CHR Member Visit my Photo Gallery
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    Question

     



    ummm if you messed with the timing its prolly not that carb could be or even your distributer is the gear right on it?

  10. #10
    autocityman4 is offline CHR Member Visit my Photo Gallery
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    yeah your probably haven a problem with that carb thats alot of carburation on a engine your not sure about if i was you id try to find somone with a carb you can borrow or get cheap and trow it on see what that does

  11. #11
    383 chev's Avatar
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    autocity when i mess with the timing the only thing that changes is the idle note it acts the same at cruise. See the biggest prob.
    I have is that the ignition and fuel delivery i have been told is that they act the same so i messed with the timing same ole.
    i changed the jet from a 73 to a 68 that the next size down that i have it got worse but with the 73 its to rich out hte tail pipe

  12. #12
    383 chev's Avatar
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    i was told to go to 75 jet and set my power valve screw down

  13. #13
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    if you've got a miss when the motor is loaded down it sounds like plug wires to me. a plug will brake down under load to. i'd check the plugs and plug rires a little closer.
    Mike
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  14. #14
    383 chev's Avatar
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    it does it in nuetral also

  15. #15
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    I think you may be too lean. With that lobe seperation you will smell nasty at the tail pipes due to the extra overlap. 850 is a little big on the carb but not too terribably large for your setup. Keep tinkering with those jets.

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