How different from auto engines?

How different from auto engines?

<HTML>What are the properties of an airplane engines that make them very different from automobile engines with respect to durability and dependability? How can they keep being restored so many times? Is there a definite life span? They are so much more expensive to buy and repair!</HTML>

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Re: How different from auto engines?

<HTML>Jack,
Automotive engines differ from Aircraft engines in many ways,They are generally made of Steel,and water cooled,Much heavier,and designed for little maintenance....AND abuse,neglect etc.
Aviation engines(the normally Aspirated type) are made of Primarily Aluminum,or an Aluminum Alloy,and derive their cooling from Air,and Oil circulation.
There are a host of other differences that cant even be approached here,but to answer youre question concerning repair costs,its the maintenance that is REQUIRED by the industry(and a smart owner/operator)that leads the way in the cost situation,and not to mention the fact that ALL parts used on an Aircraft engine MUST be FAA Approved for that specific Aircraft/Engine,or Airframe.This makes the Paper trail somewhat long,and expensive.
The only thing you need for a car part is money,and typically a small amount..An Alternator for a Chevrolet is 100 bucks(Rebuilt)one for my Cessna is 475.00 Exchange....They both do basically the same thing but..........</HTML>

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Re: How different from auto engines?

<HTML>Hello, Jack!  Alan's assessment is correct.  Also keep in mind that your automobile engine spends most of it's life between idle and 30 mph, with only occasional excursions to higher power settings.  The typical aircraft engine spends most of it's useful work at power settings between 65% and 100%.  This is not only a much higher workload with resultant higher stresses and wear-rates, but the aero engine is required to maintain a higher level of durability and reliability and is expected to meet all those requirements for a much longer chronological timeframe than the typical auto engine.  There are thousands of aero engines more than 30 years old flying around around in daily passenger carrying operations.  How many 30 year old automobiles do you see doing that?  The reason is partly due to increased maintenance standards, but also due to significant design differences.  One such design difference is the fact that aero engines were from the start designed for regular cylinder replacements, not so for  most auto engines.  Many other parts of the aero engine were designed for regular and ongoing inspection and replacement. 
Since aero engines have this seviceablilty inherent to their design, they may be overhauled or "renewed" innumerable times.  Also, due to their unique and specialty applications, they are not viewed in quite the same "dispensable" light that their auto counterparts are.
Your last question is answered by their respective manufacturers recommended Time Before Overhaul, or TBO.  This is the engine's predicted useful lifetime which has been established after operational observations and tests.</HTML>

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