Last post on Sep 29, 2003 at 7:50 AM
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Subaru Outback, Engine, Wagon
Sep 25, 2003 (11:10 am)
There are a few errors on the Gates site, so double check your information before you rely on what they have posted.
#117 of 124 Interference
Sep 25, 2003 (2:33 pm)
It's my understanding that the 2.5L DOHC is interferance whereas the 2.5L SOHC is non-interference.
Sep 27, 2003 (6:20 pm)
What does it mean if an engine is interference or non-interference?
Sep 27, 2003 (7:27 pm)
Interference means if the timing belt breaks your valves could collide with the top of the pistons and cause severe engine damage.
Non-interference means it won't. You'll still stall and need a tow truck, but it'll be much, much cheaper to repair.
Note - the 2.5l calls for an "inspection" at 90k miles. Given the labor involved, I plan to go ahead and change it at 90k.
Sep 27, 2003 (10:05 pm)
Was not my intention. I hope no one was offended by my post. I think what I was trying to say was, if Saturn can put out an over head cam engine that is chain driven, why not Subaru..or all the other interferance engines. The technology is there. Why should someone sustain a five thousand dollar expense over a broken belt. I'm aware that ohc engines are a newer design, but The valve train isn't the only part of the engine that gets stressed at higher rpm's. The average life of a race engine is one race.
Anyway good luck to all.
Sep 28, 2003 (5:23 am)
Saturn probably isn't a good comparison. When their chain guides chew up (they do regularly), the chain jumps and the mis-timed camshaft drives the exhaust valves into the piston crowns.
#122 of 124 Timing Chains
Sep 28, 2003 (9:36 am)
The EZ30 in the H6 Outbacks has a timing chain. My understanding is that the decision to use a chain versus belt wasn't for durability but to minimize the engine length. IIRC, the H6 motor is less than an inch longer than the H4.
Sep 28, 2003 (10:18 am)
Engine length, engine noise, less expensive castings, etc.---there are lots of advantages to using belts. Chains have their faults and their advantages as well. There is no perfect solution.
#124 of 124 Chains vs. Belts
Sep 29, 2003 (7:50 am)
Yep, I was gonna mention noise and reciprocating mass.