Why a CAC?
Fleet Mechanic
Joined: Jun 2011
Posts: 1,865
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From: Annandale, VA
Actually, the CaC is a compromise. In hot weather the CaC is good. In cold weather, the CaC is bad because the colder air increases igniting timing and that's bad for a diesel.
That is why our CaC is an air to water cooler. This provides a much more stable air intake temperature and helps warm the air a bit in cold weather. This is a good thing and a much better system than the 6.4 system. VW moved to this system in the 2013 Passat too.
That is why our CaC is an air to water cooler. This provides a much more stable air intake temperature and helps warm the air a bit in cold weather. This is a good thing and a much better system than the 6.4 system. VW moved to this system in the 2013 Passat too.
More Turbo
Joined: Sep 2013
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From: Watson
FTE Leadership Emeritus
Joined: May 2004
Posts: 18,787
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From: Melbourne, Aus
This is why:
http://en.wikipedia.org/wiki/Diesel_cycle
Essentially the overall efficiency of on engine is dependent on how low a temperature the gases are when they enter the combustion chamber, and how high they are when they leave. The last bit is fixed due to the metal temps, but lowing the intake temp gives you a more efficient engine.
http://en.wikipedia.org/wiki/Diesel_cycle
Essentially the overall efficiency of on engine is dependent on how low a temperature the gases are when they enter the combustion chamber, and how high they are when they leave. The last bit is fixed due to the metal temps, but lowing the intake temp gives you a more efficient engine.
FTE Leadership Emeritus
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Posts: 18,787
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From: Melbourne, Aus
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