Or does direct injection eliminate the need for EGR (exhaust gas recirculation) OR is it done via variable exhaust value timing (like the old Zetecs in Ford Escort ZX2s)?
http://en.wikipedia.org/wiki/Variable_Cam_TimingFor twin cam or DOHC engines, VCT was used on either the intake or exhaust camshaft. (Engines that have VCT on both camshafts are now designated as Ti-VCT.) The use of variable camshaft timing on the exhaust camshaft is for improved emissions, and vehicles with VCT on the exhaust camshaft do not require exhaust gas recirculation (EGR) as retarding the exhaust cam timing achieves the same result.
Excellent. Thanks for the reference. This is what the Ford Escort ZX2 with the 2.0 Zetec engine had: variable exhaust cam timing.
Still....way better than the split port junk engine. Excellent. Thanks for the reference. This is what the Ford Escort ZX2 with the 2.0 Zetec engine had: variable exhaust cam timing.
For some reason, the Focus ZX3's with the 2.0 Zetec did not have variable exhaust cam timing.
Um.....please tell me our engines have timing CHAINS, not belts.No EGR. No fuel filter either from what my dealer mechanic told me. Don't know if anyone has seen this video of how the Variable valve/Cam works. It's a 1.6L in the video but the same system as our 2.0L. Pretty fascinating how it works. Mostly all done with oil pressure.Pretty complicated system really. It's surprising it works as good as it does. Or works at all for that matter. Variable valve timing is how our cars can use just about any octane.
I don't plan to be a beta tester for that new technology.Actually not, supposed to have "life of engine" durability matching a good chain system.
Yeah, they generally introduce their own set of problems with time.EGR systems are generally a PITA, as is anything else 'extra" we'd rather not have to deal with!