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kafer65 · 11-19-2014, 05:58 PM

Very interesting. Mazda skyactive engines have revised chassis tunnels to accomodate long headers. Its supposed to keep hot exhaust gas reversion from messing up the high compression. Yeah, why not do to the exhaust what they do upstream in the intake with valving. There seems to be some issues with the valving being robust enough on both ends with some diesel makes. Would an exhaust valve introduce too much drag in this example?

11-19-2014, 05:58 PM	#7 (permalink)
kafer65 Tinkerer Join Date: Apr 2008 Location: Tennessee Posts: 284 Silver - '15 Mazda CX-5 Sport Team Mazda 90 day: 37.23 mpg (US) Thanks: 7 Thanked 63 Times in 54 Posts	Very interesting. Mazda skyactive engines have revised chassis tunnels to accomodate long headers. Its supposed to keep hot exhaust gas reversion from messing up the high compression. Yeah, why not do to the exhaust what they do upstream in the intake with valving. There seems to be some issues with the valving being robust enough on both ends with some diesel makes. Would an exhaust valve introduce too much drag in this example? __________________ Mirror deletes, 80% grill blocks, wheel covers, 50 psi tires = 6% better MPG avg. over a year. Wheel skirts overcoming ethanol winter fuel mpg losses and more! http://ecomodder.com/forum/showthrea...ead-30641.html Last edited by kafer65; 11-19-2014 at 06:10 PM..