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a couple of spk plg ?'s; could not find in search

Discussion in 'The Garage' started by lazerus, Dec 4, 2002.

  1. lazerus

    lazerus Registered Member

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    a couple of spk plg ?\'s; could not find in search

    HOwdy to all;
    I melted some AC rapid fire plugs! They worked fine until one time of hard driving and some high RPM's. All the sudden I have multiple misses. Pull plugs and the tips of the rapid fires are 'welded'!?! What caused this? I have an accel super coil--too much for rapid fires?

    Anyone else use rapid fires? Good,bad or ugly?

    Thanks
     
  2. nvrenuf

    nvrenuf NONE shall pass! Premium Member

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    Re: a couple of spk plg ?\'s; could not find in search

    Running lean can cause the electrode to melt (because the cylinder temp gets so high).
     
  3. Blazer1970

    Blazer1970 1/2 ton status

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    Re: a couple of spk plg ?\'s; could not find in search

    I agree, engine is going lean at high rpm, or you have bad detonation, or both. Figure out what it is before you melt or break your pistons.
     
  4. lazerus

    lazerus Registered Member

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    Re: a couple of spk plg ?\'s; could not find in search

    is the lean problem fixed by adjusting the carb?

    could the bad detonation be predetonation(I get some pinging at high rpms)

    thanks!
     
  5. Blazer1970

    Blazer1970 1/2 ton status

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    Re: a couple of spk plg ?\'s; could not find in search

    If you are getting pinging at high rpms, there is your problem. You need to run higher octane fuel, or back off your timing advance some. You may be able to recurve your distributor for less total mechanical advance. What octane fuel do you run?
     
  6. lazerus

    lazerus Registered Member

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    Re: a couple of spk plg ?\'s; could not find in search

    I was using the 'good stuff'. About 92 or 93 from the pump. However, now that you mention timing, I dont think that I have ever got that exactly right.
    I put a curve kit in the dist. but just guessed at the springs.
    what do heavy springs do? light springs?
    thanks for the help!
     
  7. Blazer1970

    Blazer1970 1/2 ton status

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    Re: a couple of spk plg ?\'s; could not find in search

    Light springs are going to bring your mechanical advance in faster (at lower rpm), and heavy springs will bring it in later (higher rpm). Your issue is more likely with total advance, and all of your mech. advance is probably in at high rpms no matter which springs you use. If you are not running vacuum advance, or if your vac. adv. is off a ported (not present at idle) source, you might want to try running the vac adv. off manifold vacuum, and decreasing your initial advance (set with the vac. adv. unplugged). This will limit your total advance, and still keep some vacuum advance at idle to compensate for less initial timing advance and help the engine idle and tip in better.
     
  8. lazerus

    lazerus Registered Member

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    Re: a couple of spk plg ?\'s; could not find in search

    many thanks!! I will try it this weekend!
     

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