newsance Posted August 6, 2007 Share Posted August 6, 2007 So interestingly, the 1996 2.5L makes 155 HP and asks for premium gas. The 1997 makes 10 more horsepower but no longer asks for high octane. Does anybody know the specifics of what changed? Was there a compression change in 97? head change? engine management? Quote Link to comment Share on other sites More sharing options...
ccrinc Posted August 7, 2007 Share Posted August 7, 2007 Went from hydraulic lifters to solid in '97. There may have been a piston change too, but not sure. If there was, it certainly wasn't anything radical. Otherwise, they're identical as far as the engines themselves are concerned. Emily http://www.ccrengines.com Quote Link to comment Share on other sites More sharing options...
Juan Posted August 7, 2007 Share Posted August 7, 2007 ccrinc, could there be an emission/cat issue that was overcome using premium fuel? I mean, exhaust blockage requiring more bang? Juan Quote Link to comment Share on other sites More sharing options...
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