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Why Every Automaker Is Quietly Bringing Back The Inline-Six Engine

I know the article mentions it, but turbocharging any V engine is complicated. Turbocharging seems to be a prerequisite nowadays.

(Yes, I know you can reverse the heads and place the turbo in the vee or behind it, but it isn't easy or cheap)
 
You’re right, turbocharging a V engine can be complex and costly. Still, many manufacturers use it today to boost power and improve efficiency.
 
After working on everything from single cylinder, inline 4 and 6 cylinder engines and high speed diesel V engines from 6 to 16 cylinders an inline 6 cylinder is still my favorite. Lighter and stronger in the bottom end than a similar displacement V engines, easier to work on, less parts and with the right cylinder dimensions they can give smother and better torque delivery when compared to a same displacement V engines.
 
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Inline 6-cylinder 4-stroke engine is the simplest configuration that has all forces and moments of 1st and 2nd frequencies naturally balanced.

Also positive torque on crankshaft all the time.
 
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