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Thread: Timing?

  1. #1
    BigMo
    Hey guys whats a good timing to strart at on a 496 with an 871 blower? Right now its at 32* but the idle is to high and the idle screws a backed down all the way but it still idles about 1800???? Its a pump gas motor.
    Mo

  2. #2
    Fiat48
    32 to 34. Less timing will create exhaust valve heat which you do not want. That high idle should not be a timing problem. Probably throttle plates not closing (especially secondary), mixture, sucking air, etc.

  3. #3
    Huffer
    I'm Running 496 1271 With Chiller 28 Deg With Pump Gas!

  4. #4
    Fiat48
    If you could read your exhaust temperature.....I bet you would see some pretty high temps.

  5. #5
    sleekcraft76
    what exhaust temp is to high,i was running 1400-1450 cruising and 1500 when on it hard is that ok?

  6. #6
    Fiat48
    That's the edge. I'd say 1400 is hot enough.

  7. #7
    steelcomp
    That's the edge. I'd say 1400 is hot enough.
    Alum starts to melt right above 1300! 1400 IMO is pushing it. You'd be better off down in the 1300's for a non race deal.
    Big Mo...I agree with Fiat...you probably have carb issues, but it's not your timing. :coffeycup

  8. #8
    kojac
    Big Mo,
    I run a 572 cu inch, with a 8-71 bds, Two dominators with exhaust temps at 1350 to 1450 while cruising. Timing is set at 37 degrees at 3000 rpm's
    any less timing causes the exhaust to rise and motor fouls up plugs. On 93 octane.
    Hope this helps.
    Kojac

  9. #9
    blowngas
    Timing is set at 37 degrees at 3000 rpm's
    I would be more afraid of detenation killing the pistons and bearings with that much timing on pump gas----I get nervous at 35 with 118 race fuel----don't know what boost you're running, but seems that temps should come down with different air/ fuel ratio------larger or smaller jets-----sometimes too rich conditions leave fuel still burning going out the exhaust and causes high exhaust temps----

  10. #10
    steelcomp
    sometimes too rich conditions leave fuel still burning going out the exhaust and causes high exhaust temps----That's a BIG 10-4. More than one guy's thought he was running lean because of too high ex temps! More timing helps burn that fuel. Just keep a close eye on your plugs when you start messin around. :coffeycup

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