Originally posted by DemonSVT: I ported the head inlets in such I way it helped the fuel spray go to both valves. That was a key design idea I made sure happened. I know how badly the secondary valves get caked over and rob power so keeping fuel run across them will keep them clean.
I also wanted better fuel atomization. It seems it worked just like I had planned since the 2.5L was about impossible to tune below 2500rpm without the secondaries. No matter what I did it always ran very rich under light load and idle. The 3L is the exact opposite and I am running 24lb injectors. It runs very lean at idle and light load. So much so I had to add 25% more fuel just to balance it out! Now it hovers just above stoich. (I like it a little lean)
Another thing of MAJOR note. I have not consumed a drop of oil with the 3L and I have over 2500 miles on it. (Running 0W40 Mobil 1) The extra head drains are certainly doing their job and not letting oil get pulled into the valve cover vents like the 2.5L is notorious for. Even the PCV separator has not picked up more then an ounce of oil total as well. With the 2.5L it was always getting an ounce a week. Sometimes more if I spent lots of time in the igh rpm range!
OK now I've got a few questions: 1) How would an oval port 3L be affected if it was run WITH secondaries since you've described it without? 2) With the 2.5L running "rich" at idle or light load ... was this with or without secondaries? Does this mean I could increase my mileage by driving harder? 3)Does the better oil drainage of the 3L effectively prevent buildup in the manifolds then? (If I am understanding what you are saying correctly about the oil separator)
BTW ... you should post some videos of you and your car in action!
