Quote:
Originally Posted by Gixxersixxerman
I can't agree 100% on DI being the reason these can run 12.5:1.. Motorcycles have been running 12.5:1 for awhile .. My friends r6 runs 13.1:1 on 91 pump and my 03 GSXR 600 ran 12.3:1 on manufactor recommended 87 pump
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Those are very different engines. Mazda runs 13:1 in their Skyactiv 2L but it only makes 155hp. It runs on 87, they have a 14:1 version which runs on 91. DI is the main reason they can pull it off.