do i leave it runnin rich?

Discussion in 'Small Block Tech' started by ceas350, Oct 22, 2010.

  1. ceas350

    ceas350 "THE BURNER"

    I took off my edelbrock air filter and went back to stock.now I'm runnin real rich, so much it kins burns my nose. How rich do the 350s like to run? I was thinkin of turnin the a/f screws in a bit. Thanks:beer
     
  2. techg8

    techg8 The BS GS

    hook up a vacuum gage. only go rich enough to achieve your maximum vacuum at the idle rpm you want. Thats the best setting imo.

    whats your carb jetted like?
     
  3. ceas350

    ceas350 "THE BURNER"

    Cool I will give it a shot
     
  4. ceas350

    ceas350 "THE BURNER"

    how does the vac pressure look guys. and yes the needle was just that steady, its a phone camera pic
     

    Attached Files:

  5. ceas350

    ceas350 "THE BURNER"

    sorry had to resize it
     
  6. CJay

    CJay Supercar owner Staff Member


    Its not pressure, its vacuum measured in inches of mercury.

    At what idle speed is that at? If its at 700 rpm, thats pretty damn good
     
  7. ceas350

    ceas350 "THE BURNER"

    right :Dou:
    yep about 700-750 it even is more responsive w/o the high flow air filter. the little 2 banger suprises me. still I wanna get a q-jet setup after the engine rebuild
     
  8. sean Buick 76

    sean Buick 76 Buick Nut

    That is a good reading however do as Ken says and re-tune the idle mixture screws. I sent you an e-mail before about how to do that...
     
  9. ceas350

    ceas350 "THE BURNER"

    thats the retune Sean. :beer remember what it was back then? well this is after the two rocker arms and a passenger valve cover gasket. way more stable then the one posted in my cardomain link in my sig:beer page 2
     
  10. sean Buick 76

    sean Buick 76 Buick Nut

    So I would try leaning it out a bit to see if your rich smell goes away.

    Make sure all of your plugs are getting spark because that coul cause the smell as well. Do you have any fouled plugs?
     
  11. techg8

    techg8 The BS GS

    thats really good vacuum
     
  12. ceas350

    ceas350 "THE BURNER"

    Thanks I try
    Carb is a 2 banger stock jetting
    That's my highest vac in idle. Not sure about the plugs I know I only have 25k on them. Can I just pull a pug at a time and ohm test them ir is there another way?
     
  13. ceas350

    ceas350 "THE BURNER"

    I ment to say can I ohm test the spark plug wires? If so what's a good ohm reading? I have accel wires
     
  14. Sir Speedy

    Sir Speedy Well-Known Member

    I would question the accuracy of that vacuum gauge. I have never seen a stock well tuned engine pull more than 18 or 19 inches of vacuum at idle. Does the gauge go to zero when it's disconnected?
     
  15. ceas350

    ceas350 "THE BURNER"

    yes it goes to zero. I've tested it along with one from school so accuracy is not an issue. if you check out page 2 in that cardomain link in my sig you'll see the before I changed two rockers and a valve cover. that used to be the highest I could get it to go, but now its obviously higher.:TU:
     
  16. Dan Healey

    Dan Healey Well-Known Member

    I have had vacuum that high with mild stock cams at idle, and it should be expected...
     
  17. sean Buick 76

    sean Buick 76 Buick Nut

    The easiest way is to use a timing light to see if each wire is firing. Also run the car in the dark with the hood open and look for arcs of electricity that may be shorting before the plug gets the juce.
     
  18. eagleguy

    eagleguy 1971 Skylark Custom

    Turn a/f screw in or out to lean carb? I thought backing out let in more air?
     
  19. CJay

    CJay Supercar owner Staff Member

    A more accurate way is to check the wires using a DVOM to check resistance. Anything under 11k ohms is typically good


    You can also take a squirt bottle filled with water and spray the wires down. Ive had cars stall out and wouldnt restart doing this.

    I'll dig out my AC Delco hand held spark plug wire tester from the garage and post a pic.
     
  20. techg8

    techg8 The BS GS

    turn it in (clockwise) to lean the mix. Controls fuel not air

    the screw has a tapered end that you are threading into a small orifice, restricting the idle fuel.
     

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