Quote:
Originally Posted by humfrz
Ahhhh..........yes, the old Italian tune up ........ 
humfrz |
That's supposedly Mazda's solution, they design the engine to keep the intake valves hot. There is some doubt if this is actually true as the original solution is somewhat less than official, but the sentiment is echoed in other DI Engined communities.
Article on SkyActiv:
http://www.motoiq.com/MagazineArticl...echnology.aspx
http://www.golfmk6.com/forums/showthread.php?t=63212
http://forums.vwvortex.com/showthrea...1#post60051379
http://www.golfmk6.com/forums/showthread.php?p=146579
It's kind of funny to see people balk at the idea of keeping an engine over 4,000 rpm for a sustained period or bitch about gas prices. Whether it's real or not, I don't really need an excuse to ensure my FA20 sees a handful of redline shifts per week and some sustained high rpm spirited driving on a monthly basis.
Edit: Yes supposedly D4-S combats buildup via the port injectors but has been this way by design since introduction 9+ years ago.