Quote:
Originally Posted by madfast
D-4S on the 2GR absolutely uses a version of stratified charge for cold start. PI is used on the intake stroke, and DI is used on the compression stroke. toyota calls this "weak stratified charge".
the dish in the piston has little to do with D-4S, because other cars without D-4S have the dish as well.
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Dish is better for combustion. I have seen it on the Honda L series and they used other techniques to raise the compression ratio.