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EcoBoost Engines
EcoBoost - Valve Coking Prevention
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<blockquote data-quote="Relaxed Chaos" data-source="post: 16880090" data-attributes="member: 64993"><p>According to folks at Amsoil, no oil will prevent the carbon build up on the backside of the intake valves. If catch-cans were a cheap simple fix don't you think they'd be in production cars? Catch cans don't solve this either. This is carbon from combustion, not oil from the intake track (which is a different problem if your intake air has that much oil in it. In an Ecoboost, oil in your intake means your turbo seals are leaking). Valves do not seal perfectly, so on each combustion stroke a tiny amount of carbon works it's way and deposits onto the backside of the valves.</p><p></p><p>I've used the CRC chemical valve cleaning method once per year to minimize the build up on my SHO. It takes about an hour and is simple.</p><p></p><p>Adding port injection sprays the backside of the valves, keeping them cleaner. Ford added this, but I'm not sure which year each Ecoboost received this fix</p><p></p><p></p><p>On a side note, E46 BMWs had oil separators in the EGR system to keep oil out of the combustion process. In the winter during warm up cycles there is lots of water vapor generated that condenses on cold surfaces and in the oil, creating an oily mayo or smegma. The water in this smegma freezes inside the oil separator, cracking it. This crack would allow the intake vacuum to suck all the oil out of the pan and burn it, in about 20 seconds at freeway speeds leading to engine failure. The next version put a heater on the oil separator, which occasionally would fail and not turn off, igniting and burning down the car/garage/house. Good times.</p></blockquote><p></p>
[QUOTE="Relaxed Chaos, post: 16880090, member: 64993"] According to folks at Amsoil, no oil will prevent the carbon build up on the backside of the intake valves. If catch-cans were a cheap simple fix don't you think they'd be in production cars? Catch cans don't solve this either. This is carbon from combustion, not oil from the intake track (which is a different problem if your intake air has that much oil in it. In an Ecoboost, oil in your intake means your turbo seals are leaking). Valves do not seal perfectly, so on each combustion stroke a tiny amount of carbon works it's way and deposits onto the backside of the valves. I've used the CRC chemical valve cleaning method once per year to minimize the build up on my SHO. It takes about an hour and is simple. Adding port injection sprays the backside of the valves, keeping them cleaner. Ford added this, but I'm not sure which year each Ecoboost received this fix On a side note, E46 BMWs had oil separators in the EGR system to keep oil out of the combustion process. In the winter during warm up cycles there is lots of water vapor generated that condenses on cold surfaces and in the oil, creating an oily mayo or smegma. The water in this smegma freezes inside the oil separator, cracking it. This crack would allow the intake vacuum to suck all the oil out of the pan and burn it, in about 20 seconds at freeway speeds leading to engine failure. The next version put a heater on the oil separator, which occasionally would fail and not turn off, igniting and burning down the car/garage/house. Good times. [/QUOTE]
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