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.
BRAVO!!!
4G92 SOHC and 4G92 DOHC both have 16 valves ... 2 intake 2 exhaust per piston ..
a DOHC will have bigger surface hence can use bigger valve with more flow ..
DOHC will have more freedom to tune .. where the intake and exhaust cam is seperated (assume with DVVT or adjustable cam pulley) ..
DOHC dun run cooler then SOHC ..
SMOOTHLY ? .. both have pros and cons ..
SOHC .. at low rev where the valve smaller .. area smaller.. the air flow mixture will have better mixture .. hence it will be more powerful at low rev..
DOHC .. at low rev .. the air flow is slower coz too much space.. but at high rpm .. the flow need to be faster tat is when DOHC is better then SOHC ..