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Spark knock? Really?

Discussion in 'Ford Raptor Engine Discussion and Performance Mods' started by Anthony Palazzolo, Jun 16, 2020.

  1. FordTechOne

    FordTechOne FRF Addict

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    Gotcha, we're on the same page then.

    I need to get my hands back on a VCM II. Great info for sure, much appreciated!
     
    Donmatteo likes this.
  2. Crunchtime2k

    Crunchtime2k Full Access Member

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    Vcm3 is out
     
  3. FordTechOne

    FordTechOne FRF Addict

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    That it is; just haven't had a chance to use one yet.
     
  4. Crunchtime2k

    Crunchtime2k Full Access Member

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    After trying several ford plugs such as sp578 , sp542 and no resolve , NGK 6510’s are a winner and resolved this odd pinging at 5000rpm that would occur sometimes.


    Make sure to gap at 0.028 as they come out of the box at 0.041~ and be very careful with the iridium tip. No more pinging and a noticeable upper end increase in pull.
     
  5. Antho

    Antho Full Access Member

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    @Crunchtime2k,
    Did you exhibit the noise the op posted in his video?
     
  6. Crunchtime2k

    Crunchtime2k Full Access Member

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    I did , exactly , what I have found is small gaps of 0.025-0.028 help a ton to reduce misfires that do occur in the background in small numbers but nowhere near enough to trip a trouble light or code, they are there on most 3.5 ecoboost especially when higher boost levels , check your mode6 data. That spark knock noise still occurs rarely under a perfect set of conditions for me at wot on the upper rpm range not every time but at least one a day. I have seen it on 3 raptors so far. It seems systemic and more prevalent on tuned raptors also.
     

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