Mainly a centered injector.what are the advantages? doesn't seem like a cheap way to go...
I'd like to have the one for CPL 857..The reason Cummins went to 4 valves per cylinder was driven by Emissions only... facts are you can flow much more air with 2 valves per cylinder than with 4... as for BSFC...I can get any data sheet you want..
Meaning absolutely no disrespect to Mallo986, but the claim that 2 valve cylinder heads can flow much more air than 4 valve cylinder heads is false. All of the reading I've done suggests that comparable 4 valve/cylinder heads flow far better. As an example, when performance camshaft manufacturers started to manufacture after market cams for those engines with 4 valves per cylinder they attempted to use what had worked with 2 valve heads (ie lotsa lift and long duration) but they found that the 4 valve heads wanted far less lift and duration than 2 valve heads. 2 small intake valves (so too with 2 small exhaust valves) have far greater seat area than 1 large valve does. Same should hold true if turbo charged.The reason Cummins went to 4 valves per cylinder was driven by Emissions only... facts are you can flow much more air with 2 valves per cylinder than with 4... as for BSFC...I can get any data sheet you want..