SOHC or DOHC

**mazingerZ** · November 29th, 2007 04:02 PM

Sirs,

I have this ongoing argument with my friends as to which type of configuration is more fuel efficient, an SOHC or DOHC type engine. I would like to know the pros and the cons of each type. Any inputs would be very highly appreciated.

**4JGtootsie** · November 29th, 2007 06:24 PM

Engines with DOHC heads are more powerful consequently uses more fuel. It usually use more than one exhaust and/or intake valves per cylinder. The openning and closing of valves can be better configured because of the extra set of lobes of an additional cam.

**vito corleone** · November 30th, 2007 12:49 AM

i remember coming across this site before which can answer your question. . .

http://www.samarins.com/glossary/dohc.html

"THOUGH HOME TO US ALL, THE EARTH IS MUTE.
IT DOESN'T GET A VOTE IN ANY CONGRESS OR PARLIAMENT.
IT DOESN'T OWN BLOCKS OF SHARES IN THE MARKET.
IT DOESN'T RISE UP AT A PROTEST RALLY. IT CAN'T EVEN BUY A HYBRID CAR.
THE EARTH HAS NO VOICE--SO WE MUST SPEAK FOR IT."

**speedyfix** · December 3rd, 2007 10:37 AM

fuel consumption is not measured by the number of cams you have, rather by the displacement of the engine and what the intended purpose is.

**niky** · December 3rd, 2007 06:38 PM

fuel consumption really depends, specifically, on the engine.

DOHC heads technically have more moving parts and a heavier valvetrain, which can lead to higher consumption, but that can be designed to be more efficient at a wider range of speeds because of the more flexible breathing allowed by the extra valves.

**washburn** · December 4th, 2007 02:42 AM

funny thing is that my friend's 1.6 4g92 (1st gen) DOHC mivec is more fuel efficient than my 1.6 4g92a SOHC lancer, a 2km/l difference, maybe fuel consumption really depends on what transmission you are using because I got matic and he got manual, hmm

**clreceno** · December 4th, 2007 11:02 AM

DOHC...

**speedyfix** · December 4th, 2007 08:03 PM

driving style, load, rim size etc also factor in. plus how well maintained the engine is.

**uls** · December 5th, 2007 11:58 AM

fuel consumption is affected by a lot of things. Driving style, the weight the engine is trying to pull (or push), traffic, etc etc

focusing on just engine specs pag dating sa fuel consumption is like focusing only on diet to keep urself healthy (not considering exercise, environment, genetic factors, stress level, income etc)