Quote:
Originally Posted by karguy
The new direct injected V8 is not necessarily better.AFM... 
Which makes me think why would GM go through the additional cost of direct injection (as in a more expensive higher pressure pump) if the engine really doesn't make more power (additional variable valve timing) or get better mileage without AFM...
Also on direct injected engines intake valves can get more carbon buildup on intake valves since there is no gas that can clean them.
Another hint may be Porsche.While the new regular 911 get direct injected engines,the new sports GT3RS will have not direct injection.
Direct injection might be another gimmick for maybe slightly cleaner emissions...who knows? |
Was thinking about AFM only...which my understanding is what shuts off the 4 cylinders...V-6s now have direct injection, without AFM, no cylinder shut-down...V-8's have L99 with AFM, LS3 does not have AFM...Wondering about the LT1, cylinder shut-down with both automatic and manual trans?, or AFM (cylinder shut-down) with the manual trans also with the LT1....