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DURATEC Ti-VCT Performance (2012-Current) The place to chat about any Duratec 2.0L Ti-VCT engine performance, tuning and exhaust related upgrades.

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Old 06-14-2013, 12:04 PM   #11
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Here is something to consider: since our engines are higher compression, direct injection, a larger spark gap may not actually be the answer.

A dyno would give a better idea of what is going on but think of this: say a larger spark has a wider spark but still the same amount of energy released by the coil. A wide and thinner spark may seem to provide a better burn but it is also less stable. High rpm, high load at WOT and there is a chance you could still get spark blowout.

What you really want is the most spark energy throughout the entire powerband. I'm not totally sure how the ecu handles spark advancement/dwell and recharge or if they are all preset and static.

So in the end a smaller gap (stock 0.036~) may also be good for best overall performance/economy.
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Old 03-22-2014, 04:49 PM   #12
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What engine size are you referring to? As I'm in the uk, and think the only engine size for the ti-vct engine is a 1.6, which is what I have. So with that in mind, will that mean that plugs for a 2.0 litre engine may be different to 1.6? I've been looking at boschs website and they have two types, laser platinum, and another type but it doesn't say much about them, think they're yttrium? But I sent an email, and they said they have the super 4 range for the focus cmax ti-vct which I'm hoping is same as standard 5 door hatch, but they do know show up when you use the search feature, and I used the exact same model number super 4 plugs on a zetec-e engine. But the super4 were brill, had better fuel economy and car was more responsive. If I was to recommend plug leads, I'll always say magnecor, but not sure if the 8.5mm type will fit in the lead holders easily, but I'm confident that even the 8mm type will be one if the best you can get (honestly I don't work for the company, just reading uk mags such as fast ford, max power, redline etc, a lot of ppl will choose these, and they can do custom leads, their website is very detailed explaining the diff types if distributors and sealing boots, so they know their stuff.
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Old 04-18-2014, 09:26 AM   #13
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How often should plugs be changed?
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Old 04-18-2014, 12:32 PM   #14
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the mileage in the service schedule is 100K miles. I'll probably do mine at 50K. They are easy to do.
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Old 04-18-2014, 01:01 PM   #15
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Good idea.

Even if you don't change them that early, removal/inspection/a bit of never-seize on the threads is a good idea at that mileage. Plugs left untouched too long can be a problem to remove.
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Old 04-18-2014, 02:27 PM   #16
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I did mine around 35K. Didn't want them to seize in the aluminum head. I know iridium plugs are supposed to go at least 100K ... but on my 2011, they were out of gap spec at 35 (or there abouts).

I replaced with platinum. Will change again at 70K
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Old 04-18-2014, 02:32 PM   #17
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Quote:
Originally Posted by Miller88 View Post
I did mine around 35K. Didn't want them to seize in the aluminum head. I know iridium plugs are supposed to go at least 100K ... but on my 2011, they were out of gap spec at 35 (or there abouts).

I replaced with platinum. Will change again at 70K
Exactly this. They will last longer than most (all?) other types, but they still wear down. I pulled mine at 30k (habit) and re-gapped them along with applying some anti-seize on the threads.
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Old 04-18-2014, 06:07 PM   #18
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So it's probably a good habit to do them around 30-35K then? i've always done mine on other cars around 60K. These being as easier as they are to replace though, i'd have no problem doing them sooner.
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Old 04-19-2014, 10:55 PM   #19
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Quote:
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So it's probably a good habit to do them around 30-35K then? i've always done mine on other cars around 60K. These being as easier as they are to replace though, i'd have no problem doing them sooner.
Pull and regap. Iridium tips last much longer. Plus, it's good to get them out sooner rather than later.
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