Anyone have initial timing set higher than 12?

Discussion in 'The Garage' started by mrk5, May 17, 2004.

  1. mrk5

    mrk5 The Sticker Guy Moderator Vendor GMOTM Winner Author

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    I was doing some searching on timing here in the forum. I'm curious if anyone is running higher than 12 degrees initial timing. The Demon carb I have recommends 18-24 /forums/images/graemlins/yikes.gif That just seems insane. I know this is going to get a bunch of different opinions, but I'm just curious what they are. /forums/images/graemlins/thinking.gif
     
  2. sled_dog

    sled_dog 1 ton status

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    sure it doesn't mean total advance?
     
  3. slimlynn1

    slimlynn1 1/2 ton status

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    What are the specs of the engine and carb? I've got mine at about 22 deg.
     
  4. Beast388

    Beast388 1/2 ton status

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    [ QUOTE ]
    The Demon carb I have recommends 18-24 /forums/images/graemlins/yikes.gif That just seems insane.

    [/ QUOTE ]

    Since when does a carb solely determine timing? I wonder why they recommend that? /forums/images/graemlins/dunno.gif /forums/images/graemlins/thinking.gif

    There are far too many factors besides a carb that determines timing.......compression ratio, advance curve, cam, octane of gas, engine load etc etc to name a few.

    Strange...... /forums/images/graemlins/thinking.gif /forums/images/graemlins/thinking.gif
     
  5. mrk5

    mrk5 The Sticker Guy Moderator Vendor GMOTM Winner Author

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    [ QUOTE ]
    Since when does a carb solely determine timing? I wonder why they recommend that? /forums/images/graemlins/dunno.gif /forums/images/graemlins/thinking.gif

    There are far too many factors besides a carb that determines timing.......compression ratio, advance curve, cam, octane of gas, engine load etc etc to name a few.

    Strange...... /forums/images/graemlins/thinking.gif /forums/images/graemlins/thinking.gif

    [/ QUOTE ]

    My thoughts exactly.

    [ QUOTE ]
    What are the specs of the engine and carb? I've got mine at about 22 deg

    [/ QUOTE ]

    I've got a recently rebuilt (as of 4/30) 350, bored .060, should be close to 9:1 compression, CompCam 268H (.454 lift and 218 duration), Thorley headers, Performer intake, MSD Pro-billet distributor, and 625 Road Demon. Plus living at a higher altitude does allow a little more advance, normally I would run 10-12.
     
  6. TWISTEDJACK

    TWISTEDJACK 1/2 ton status GMOTM Winner

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    Mine likes to run at 30-32 /forums/images/graemlins/dunno.gif
     
  7. m j

    m j 1/2 ton status

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    so at what initial do you start to see problems or power loss?
    did you just pull the 12* number from a hat or did you tune to that point?

    combustion chamber design and fuel will dictate a bit on timing requirements
    better chambers need less advance IIRC
     
  8. mrk5

    mrk5 The Sticker Guy Moderator Vendor GMOTM Winner Author

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    Basically I set it their based on the advice of a mechanic. But the more research I do, the more I find that using one number for all engines is not the best. I plan on using the vacuum method to see how that works. /forums/images/graemlins/thinking.gif

    But yeah, basically I set the timing to 12* and tuned the carb to work with that.
     

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