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What Engine is an Interference Engine


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Every WRX is an Interference, as well as ALL 2.5L, and all 2.2L built since 1999 (more acute valve angle on late build 2.2L).

In otherwords, Every Subaru engine built since 1999 IS. I don't like it, so please don't shoot the messenger. (wish I had my ol' 1990 2.2L in my Forester):)

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Any of the DOHC Engines (1996-1999 2.5L engines, and all of the turbo engines from 1995-current) are interference engines (Intake Valves can hit exhaust valves, and Valves can hit the pistons). Any of the Phase 2 Engines (1999 or Newer) are also interference engines in the way that the valves can hit the pistons.

 

 

Mike

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