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Old 01-27-2012, 09:55 PM   #9
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So Volkswagen is adopting the combined GDI + PFI combustion concept in their new 1.8T

It uses multi-hole injectors instead of dual fan-type sprays. You'll also notice that it has a tumble control valve. The port injectors are not used during warm up, but rather the direct injectors fire two to three times per cycle depending on coolant temperature. This engine is boosted and not optimized for high rpm operation.
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