470 igniton timing

Electrical & Ignition

  1. JohnEngland

    JohnEngland Active Member

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    Trying to get the timing adjusted on my 73 Charger. Looking for a starting point. I presently have it set at 18 initial and 35 total and it seems dead under 4500 rpms. Its a 470 stroker build with a hughes cam (seh3236bl-10) .571 intake .582 exhaust .236 duration and 110 lobe separation. It has a 750 vac secondary carb. 4 Speed car. Also when setting the idle mixture screw it will die if I screw them both in al the way but will not die if I screw them all the way out (really no change as I screw them out). Any help is greatly appreciated..
     
  2. 66Satellite47

    66Satellite47 Well-Known Member

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    34 - 36* total is in the ballpark for an iron head motor. If you have a Holley the idle screws should be in the 1 1/2 to 2 out range. But that has nothing to do with any RPM above 1000 -1200. If it's a Holley carb try playing with the secondary springs in the diaphram.
     
  3. JohnEngland

    JohnEngland Active Member

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  4. Xp29h

    Xp29h FBBO Gold Member FBBO Gold Member

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    I have a 512 stroker and needed to bump initial to 21 to get it going. It seems though your in the ballpark and it should be doing better..but the 750 might be too small...maybe

    It's good you're getting adjustment out of the carb air screws. Sounds to me like possibly not getting fuel it needs early. You can bump the squirters up a size at a time to see if that makes a difference.. and maybe jets too

    I'm sure there will be others that chime in with good thoughts too. Good luck!
     
  5. JohnEngland

    JohnEngland Active Member

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    What controls the fuel after idle circuit. Transition circuit? Does the primary jet come into play after idle circuit?
     
  6. not so famous bob

    not so famous bob Well-Known Member

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    I have a 505" stroker, and have settled on 21 initial for now also. Am running 91 octane pure gas. also a fast 2.0 f.i. system. Still undecided about all out timing w/ 91 octane. back in the day we used to bring it all in around 2800-3000 , but that was w/ good gas that we don't have now. Think I`ve got it at 34 total, all in at 3600 now. Any and all thots are welcome on this. the timing and mixture can be set using the handheld -very easy . oh, alum. headed -10.3-solid street roller-727.
     
    Last edited: Aug 13, 2017
  7. JohnEngland

    JohnEngland Active Member

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  8. 66Satellite47

    66Satellite47 Well-Known Member

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    My Indy heads like 35* total. In the old days my iron heads wanted 38*. Never looked at initial since my dist was "all in" by 1000 RPM (idle).
     
  9. not so famous bob

    not so famous bob Well-Known Member

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    hand h
    3x4 screen for the fuel inj. set up, tells actual everything that pertains to the engine while it is running. Can change timing- fuel mixture- etc. while setting in the car, love that part of it. it will advance and retard the timing up to 8 degrees on its own as needed. look up "F.A.S.T 2.0 " fuel inj. system.
     
  10. JohnEngland

    JohnEngland Active Member

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  11. not so famous bob

    not so famous bob Well-Known Member

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    what gas ?
     
  12. JohnEngland

    JohnEngland Active Member

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  13. 66Satellite47

    66Satellite47 Well-Known Member

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    My new Indy head motor is 12.4 CR so it gets 110 octane. My 500" 10.5 CR EDE head motor was good with 93 on the street at 35 - 36 total.
     
  14. JohnEngland

    JohnEngland Active Member

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    What was your initial timing on 10.5 motor?
     
  15. 66Satellite47

    66Satellite47 Well-Known Member

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    I used 36*. Worked good for the street with 93 gas.
     
  16. JohnEngland

    JohnEngland Active Member

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    Initial timing was 36 degrees?
     
  17. 66Satellite47

    66Satellite47 Well-Known Member

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    No, total. I never look at initial. My distributor is all in by 1000 rpm. It's a race setup.
     
  18. not so famous bob

    not so famous bob Well-Known Member

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    Can`t get 93 around here, 91 is the best w/o buying race gas. Guess I`ll have to do some mixing w/ my old concoction.
     
  19. Cranky

    Cranky Moderator Staff Member FBBO Gold Member

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    What's your cranking PSI? Generally, the lower that is, the more initial they like and again, generally....the more total too. If an engine likes more total, I'll give it all it wants but it also depends on what your compression ratio AND cam timing is. If it's not pinging in the lower rpm ranges then it can usually stand more initial. What is your comp ratio and where is the cam set?
     
  20. JohnEngland

    JohnEngland Active Member

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    10.6 to 1
    Installed centerline 106 degrees