Spark plug options

Correction I have been using Denso ITV-22, I changed them this summer to the motorcraft sp534's. Cause the Denso's were not readily available. I can tell you this the denso's looked excellent after 2yrs on them. I never checked the gaps on them, but they looked to good to toss.
 
crash712us said:
Correction I have been using Denso ITV-22, I changed them this summer to the motorcraft sp534's. Cause the Denso's were not readily available. I can tell you this the denso's looked excellent after 2yrs on them. I never checked the gaps on them, but they looked to good to toss.
Click to expand...

Hhhmmm  ..... I stand corrected
 
crash712us said:
Correction I have been using Denso ITV-22, I changed them this summer to the motorcraft sp534's. Cause the Denso's were not readily available. I can tell you this the denso's looked excellent after 2yrs on them. I never checked the gaps on them, but they looked to good to toss.
Click to expand...
So your top recommendations would be Motorcraft & Denso?
 
I can't tell a difference, car seems to run the same. Motorcrafts $25 Denso $60+ that would be the only difference I can note at this time.
 
Ok so some experimentation last night. Pulled the plugs and gapped them at .32, started getting misfire counts on FORSCan. Mind you there was 10 during the whole trip. But nevertheless 10. Whereas before at .30 there was 0. KR was not effected. I'm sure these intermittent misfires hurt performance I really couldn't feel a huge difference. Pulled the plugs and gapped them at exactly .30 misfires gone. So the moral if this story. Check the gaps and ensure they are actually at .30.   


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Good info shoboat. I wish I knew more about ignitions or at least more details on coils and such. Cause narrowing the gap has its draw backs as well. Wider gaps have faster and flame propagation, but I have yet to see any spec's on the stock coils or even after market ones. And would more voltage allow you to run a larger gap and not have spark blowout. Ive seen testing on how spark gap has a big effect on efficiency and emissions.
 
crash712us said:
Good info shoboat. I wish I knew more about ignitions or at least more details on coils and such. Cause narrowing the gap has its draw backs as well. Wider gaps have faster and flame propagation, but I have yet to see any spec's on the stock coils or even after market ones. And would more voltage allow you to run a larger gap and not have spark blowout. Ive seen testing on how spark gap has a big effect on efficiency and emissions.
Click to expand...

Yup, and also idle quality. I have noticed that the idle is a touch rougher at .30 than .32. I wonder if the F150 coils work on the transverse EB? Sooner or later someone will come out with a coil back for those.


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What would be the best gap on a stock tune? Getting plugs changed at my 45k oil change next week.


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ShoBoat said:
crash712us said:
Good info shoboat. I wish I knew more about ignitions or at least more details on coils and such. Cause narrowing the gap has its draw backs as well. Wider gaps have faster and flame propagation, but I have yet to see any spec's on the stock coils or even after market ones. And would more voltage allow you to run a larger gap and not have spark blowout. Ive seen testing on how spark gap has a big effect on efficiency and emissions.
Click to expand...

Yup, and also idle quality. I have noticed that the idle is a touch rougher at .30 than .32.
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Click to expand...

I wish we could readily find this data... And I wonder if there are parameters beyond timing that the ECM controls related to spark.  I my SP534s are gapped at 0.30, but I have experimented with gap due to slight vibration at idle which resolves with an extra 100 rpms at .030... Interestingly this is only after the O2 sensors are warm and the slight vibration is not present in open loop operation when I start cold initially.  This resolves at the increased gap of .032.  I stayed at .030 based on Dan's recs.
 
Yeah my  idle is a little rough also. Has been this way for as long as I can remember. Not really a issue though.


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BiGMaC said:
ShoBoat said:
crash712us said:
Good info shoboat. I wish I knew more about ignitions or at least more details on coils and such. Cause narrowing the gap has its draw backs as well. Wider gaps have faster and flame propagation, but I have yet to see any spec's on the stock coils or even after market ones. And would more voltage allow you to run a larger gap and not have spark blowout. Ive seen testing on how spark gap has a big effect on efficiency and emissions.
Click to expand...

Yup, and also idle quality. I have noticed that the idle is a touch rougher at .30 than .32.
Sent from my iPhone using Tapatalk
Click to expand...

I wish we could readily find this data... And I wonder if there are parameters beyond timing that the ECM controls related to spark.  I my SP534s are gapped at 0.30, but I have experimented with gap due to slight vibration at idle which resolves with an extra 100 rpms at .030... Interestingly this is only after the O2 sensors are warm and the slight vibration is not present in open loop operation when I start cold initially.  This resolves at the increased gap of .032.  I stayed at .030 based on Dan's recs.
Click to expand...

The stock SP534 plugs were actually gapped at .32 from Ford. Hence why I didn't have the vibration. I began noticing the same as you described when I went to .30 with the NGK plugs. Isn't the stock gap for the 13+ .30?


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Changed plugs at 15k,right before my trip to south,installed SP-534 ,they came pregapped ao 0.32 and installed them cause was in hurry,car seems to run smoother than at 0.30 with same plugs but notived better fuel economy gapped at 0.32??
 
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