bubbaleenc
Owning the country roads.
- Joined
- Jul 26, 2016
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- North Carolina
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- '16 EX-T Sedan '01 4Runner '18 Suburban
For clarification, the difference between mass-produced car engines and unit-produced locomotive and aircraft engines is summarized thus:
Most automotive internal combustion engines (exotics such as McLaren exclluded) are mass-produced by the 10s to 100s of thousands by machines within exceptionally tight tolerances and are "batch tested" (taking representative samples from each production lot). Each new engine is cleaned inside and out, over-filled with lubricating fluid (similar to, but chemically different than regular or break-in motor oils), drained, and sometimes cleaned, filled and drained subsequent times to remove all significant metal shavings. The engine that is installed in most mass-produced cars is exceptionally clean and just needing new fluid to operate straight after installation.
Unit-produced aircraft engines are made mostly by hand. Testing occurs on each unit. The quality tested unit is then installed in the aircraft. The engine undergoes a rigorous initialization period (break-in) that settles each part and clears the myriad metal and other Foreign Objects from the initial build. Once the aircraft is certified for service (after tightly regulated initialization), fluid changes are still required on a strictly regulated interval due to the vastly different forces and conditions a jet / prop engine experience versus a passenger vehicle.
Wisdom of one engine type and application is useful, but does not necessarily translate to all other engine applications.
Most automotive internal combustion engines (exotics such as McLaren exclluded) are mass-produced by the 10s to 100s of thousands by machines within exceptionally tight tolerances and are "batch tested" (taking representative samples from each production lot). Each new engine is cleaned inside and out, over-filled with lubricating fluid (similar to, but chemically different than regular or break-in motor oils), drained, and sometimes cleaned, filled and drained subsequent times to remove all significant metal shavings. The engine that is installed in most mass-produced cars is exceptionally clean and just needing new fluid to operate straight after installation.
Unit-produced aircraft engines are made mostly by hand. Testing occurs on each unit. The quality tested unit is then installed in the aircraft. The engine undergoes a rigorous initialization period (break-in) that settles each part and clears the myriad metal and other Foreign Objects from the initial build. Once the aircraft is certified for service (after tightly regulated initialization), fluid changes are still required on a strictly regulated interval due to the vastly different forces and conditions a jet / prop engine experience versus a passenger vehicle.
Wisdom of one engine type and application is useful, but does not necessarily translate to all other engine applications.
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