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Message: [QUOTE="backwoodsboy, post: 635456, member: 5415"] IDI's actually had higher compression ratios than the DI 7.3. Something like 21.5:1 for an IDI vs 17.5:1 for a 7.3 Powerstroke. This made them less suitable for high boost applications needed to make power. Hypermax had a mean IDI back in the day, and I believe it was running reduced compression in the neighborhood of 15:1. Same engine was also running an inline P-Pump, custom injectors, twin turbo's, and had some extensive head work done. Other than that, there isn't much info on the engine. There's some speculation that it eliminated the pre-chamber (that caused the stock heads to flow like chit) which in effect no longer made it an IDI. [/QUOTE]

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