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Subaru Boxer Engine Pros Cons
From a mechanical point of view, the biggest advantage other than those listed, is the lack of vibration.
The boxer configuration means each pair of cylinders balance each other, as one moves so does its mate, balancing each other out.
As for the timing chain, that's another controversy, I'd rather have a belt than a chain.
Best of luck.
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Subaru Boxer Engine Pros Cons
Any time you have a moving (especially turning) part in an engine it needs to be balanced, and the more it weighs the more work it is to get it balanced.
A timing chain weighs a lot more than a belt, so it is more parasitic losses due to imbalance and extra weight to turn it.
A belt or chain is a wear item, it only has a limited life span and will need to be changed, granted the chain has a longer life, but I would rather change the belt and know it's fine then wait for the chain to hand grenade the engine.
Best of luck.
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Subaru Boxer Engine Pros Cons
Ken, I hear what you're saying, but with todays modern materials the belts are far stronger than they need to be.
Bear in mind though, a chain is only 'supposed' to have the same life expectancy as a belt. It's just people don't worry about chains. Early belts gave the concept a bad rap because of breakage or skipping teeth on a bad backfire and then causing the 'interference' part to rear it's ugly head.
Best of luck.
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Subaru Boxer Engine Pros Cons
Ken, I honestly believe it's a combination of legalez and a fear thing.
A lot of auto companies got stung really badly by timing belts. At first they weren't specifying them as a 'wear item' and so it was under warranty, so was all the other parts that got munched up when they broke!!!
The interesting part is that almost every timing belt out there is made by the same company these days, so we can assume they are all made to the same standards and with similar materials, etc., however, depending on what it goes into, it is scheduled to be replaced at between 30k miles (yes 30, Volksy diesels and some small Ford gas engines) and
about 100k miles.
So the way it works is, the car companies gamble that more people will give them $$$ from belt changes, than will make warranty claims if they let go before scheduled replacement points.
However, a friend of mine has a fleet of compact pickups and cars, he NEVER changes the timing belts at recommended points. He says only about 1 in 25 of them ever go before he gets rid of the vehicle at about 300k kms (180k miles). His drivers are not gentle on the vehicles.
Sounds like a case of over-caution to me.
BTW, the Subaru engines are about 50/50 interference design and non-interference.
Best of luck.
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Subaru Boxer Engine Pros Cons
The use of a Subaru engine in an aircraft has very little to do with dependability, reputation or quality.
It is the only widely available, currently produced, horizontally opposed engine.
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