04-12-2014, 12:30 AM
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#13 (permalink)
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It's all about Diesel
Join Date: Oct 2012
Location: Porto Alegre, Rio Grande do Sul, Brazil
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Quote:
Originally Posted by Daox
My theory on this is that the port injection allows more time for the fuel to vaporize and the benefits of that outweigh the benefits and costs of direct injection. Due to the way Toyota does their atkinson cycle, part of the intake charge is pumped back out of the intake valve during the compression stroke. This allows more time for the fuel to vaporize and to cool the intake charge thus producing an anti-knock benefit. If they went to direct injection, they would loose some of this effect.
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Makes sense. |
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