Jul 15 2012, 02:18 AM
QUOTE(cybermaster98 @ Jul 13 2012, 10:09 AM)
Advantages to having a DOHC engine over a SOHC is that the engine has twice as many intake and exhaust valves as a SOHC engine. This makes the engine run cooler and more smoothly, quietly, and efficiently. But the downfall is that DOHC engines cost more for repairs.
DOHC engines also allows the spark plug to be placed right in the middle of the combustion chamber. This promotes efficient combustion. With SOHC, the camshaft is usually in the middle of the head because it has to drive both the intake and exhaust valves, robbing the sparkplug of it’s optimal location.
A SOHC 16 valve engine would have better torque on the low end where the DOHC valvetrain’s weight results in lower torque. But at high engine speeds, the 16 valve DOHC engine’s peak torque and horsepower would be greater.
Theorythically yes,that's what they teach u in schoolDOHC engines also allows the spark plug to be placed right in the middle of the combustion chamber. This promotes efficient combustion. With SOHC, the camshaft is usually in the middle of the head because it has to drive both the intake and exhaust valves, robbing the sparkplug of it’s optimal location.
A SOHC 16 valve engine would have better torque on the low end where the DOHC valvetrain’s weight results in lower torque. But at high engine speeds, the 16 valve DOHC engine’s peak torque and horsepower would be greater.
But in reality nowadays,not always like that,many advancement had re-written the guideline we used to be thaught
I had driven both 8th-gen civic1.8(SOHC) and 2.0(DOHC) and fuel efficiency is really noticable when using the 1.8 compared to 2.0 fuel-sucker
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