- September 18, 2003
- Reaction score
- Year, Model & Trim Level
- 2010 Mountaineer Premier
GDI fuel delivery was done to improve emissions and mpg. The early versions used only one injector placed to deliver fuel directly into the combustion chamber. This eliminated the ability of previously used port fuel injector systems to clean carbon buildup off the intake valves. Hence the single port GDI engines suffer from very bad carbon buildup on the intake valves. Carbon buildup is caused from oil being sucked into the intake track via the PVC system. In fact, carbon buildup on single injection GDI engines was such a major issue the manufacturers added back a port injector on GDI systems. This injector does not spray every combustion cycle. It does this periodically to keep most of the benefits of GDI in place while helping to wash carbon off the intake valves. Catch cans serve a very worthwhile purpose on single port GDI engines. The jury is still out on the effectiveness of dual port injection which is a very good reason to use a catch can on them. The only way to remove carbon from the intake valves is to pull the intake off which isn't an inexpensive job on today's engines.Because they build carbon soot crap mobiles like BMW/ VW/ Audi. Even they are using more high composite materials in their engines to reduce the problems that you are talking about. Buy a vehicle from this decade then it won't have an issue, the problems you speak of are found on 10-15 years old motors. No amount of K&N filters or Oil Catch cans are going to save a 100-200k mile motor from any long term effects. Only taking care of the oil changes and routine maintenance will. Oil catch cans serve a purpose on older rides but again it is like a band aid covering other issues. Ethanol is more of an enemy to old rides then uncontrollable oil sludge build up. I have rebuild many an intake on 99-2010 rides all caused mainly from poor maintenance and ethanol build up.
but to answer your question they do this to get a more clean combustion and get more complete burn. Same reason why Dodge uses 2 spark plugs in their Hemi motors per cylinder and the Ford 6.2 liter boss does the same. Reduces emissions and improves fuel economy. I have already prepared for the future and that is EV. Everything in the next 10 years will be EV. I plan to keep my sentimental STI since it is worth more now than what I paid for it when new in 2016.
EVs have nothing to do with this thread unless you are telling people with GDI turbocharged engines to sell what they have and buy an EV. Also, battery powered EVs have massive issues too so thinking they are the future might be premature. Hydrogen powered vehicles have many advantages over battery EVs and many companies, higher education institutions and research facilities are making big advances in this technology. The world's electrical system and generaing capacity isn't even close to having the ability to support EVs in any large number. It would take trillions upon trillions of dollars to make battery EVs viable worldwide. Then there is the massive environmental impacts to producing EVs. Especially the batteries. In the end it might be more environmentally friendly to use fossil fuels more efficiently than strip mine the world for trace minerals and metals. If we go with battery EVs then what fuel will we burn to generate the electricity required? Green energy won't even come close to meeting the demand. This is why hydrogen has a very good chance to by the long term solution, IMO. Also, that 8 second Tesla guzzles electricity at a ferocious pace when driven hard. Make a few passes and then sit around for an hour charging the battery from a fossil fuel or uranium fired generating plant. So much for all the environmental reasons to go EV.The future is EV. Period, especially with Porsche and Tesla building sub 8 second quarter rides.