Forum Discussion
ShinerBock
Jun 18, 2015Explorer
Just because an engine has a turbo does not mean the engine is in a high level of stress. I have heard this from many people hear and I do not understand where they are getting this. I don't know why people see turbos and automatically think engine stress and that the engine will not last long. If that were true then we would have blown turbo diesels all over the place since they have much higher stresses due to compression ignition. However, they are "overbuilt" to handle that stress which is one reason of their longevity along with not needing that much engine speed(rpm) to get its power. Also, saying that a modern DI V8 engine is under "traditional" stresses is not true either.
Let's take a further look into what you are stating using the 2.7L Ecoboost and a 5.3L Ecotec which is the engine that is purchased the most.
2.7L Ecoboost V6 DI
Horsepower: 325 @ 5,000 rpm
Torque: 375 @ 3,000 rpm
Fuel: 87 Octane
Compression ratio: 10:1
Block: Compacted Graphite Iron/Aluminum
Head: Aluminum
Cylinder liner: None since the block is CGI like a diesel
Main bolts per piston: 6
5.3L Ecotec V8 DI
Horsepower: 355 @ 5,600 rpm
Torque: 383 @ 4,100 rpm
Fuel: 87 Octane
Compression ratio: 11.0:1
Block: Aluminum
Head: Aluminum
Cylinder liner: Cast Iron
Main bolts per piston: 4
Looking at the two, it is apparent that the 2.7L is a bit "overbuilt" in comparison with its CGI block which inherently makes the cylinder walls CGI and 6 mains. The 5.3L gets its peak power and torque at higher engine speed, and has a higher cylinder compression ratio even though the 2.7L is turbocharged. Just because something is turbocharged does not mean it wasn't built to handle it nor does it mean that it is under more stress than a non turbo engine.
Let's take a further look into what you are stating using the 2.7L Ecoboost and a 5.3L Ecotec which is the engine that is purchased the most.
2.7L Ecoboost V6 DI
Horsepower: 325 @ 5,000 rpm
Torque: 375 @ 3,000 rpm
Fuel: 87 Octane
Compression ratio: 10:1
Block: Compacted Graphite Iron/Aluminum
Head: Aluminum
Cylinder liner: None since the block is CGI like a diesel
Main bolts per piston: 6
5.3L Ecotec V8 DI
Horsepower: 355 @ 5,600 rpm
Torque: 383 @ 4,100 rpm
Fuel: 87 Octane
Compression ratio: 11.0:1
Block: Aluminum
Head: Aluminum
Cylinder liner: Cast Iron
Main bolts per piston: 4
Looking at the two, it is apparent that the 2.7L is a bit "overbuilt" in comparison with its CGI block which inherently makes the cylinder walls CGI and 6 mains. The 5.3L gets its peak power and torque at higher engine speed, and has a higher cylinder compression ratio even though the 2.7L is turbocharged. Just because something is turbocharged does not mean it wasn't built to handle it nor does it mean that it is under more stress than a non turbo engine.
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