DOHC vs SOHC

[Supierreman]

Originally posted by pepengtom
ang DOHC ba ay 4v/cyl = 16valve
and ang SOHC, 2v/cyl = 8 valve?

hindi bat 16valve na mga lumalabas ngayon ng SOHC?
e san naman napupunta ung ibang 8 valve?

DOHC/SOHC= OHC stands for overhead cam... it's about the camshafts and camgears either 2 or 1... nothing to do with the valves.

nasa cylinder yun. kaya 4 valves per cylinder..either having 2 cams or a single cam sa taas.

[pepengtom]

ah.... ok gets ko na...

[zippo]

asteeg.. buti napagusapan din toh. hindi ko rin kse alam pinagkaiba ng dalawa. sarap. dami ko talaga natututunan sa tsikot.

[Automahn]

Mga sir, pakiexplain naman po in layman's terms kung bakit mas matakaw sa gas ang mga DOHC kaysa SOHC. Thanks. :D

[empy]

Originally posted by the_wildthing
The way I understand it, the 4G-92 sa Lancer pizza ay SOHC pero 16V. Ang 4A-FE ay DOHC na 16V. So the cam lobes on a 4G-92 are pushing arms that push the valves... Please correct me if I'm wrong. I haven't seen an open a 4G-92.

yes, you are correct. the cam pushes rockers (also called rocker arms) which allows it to control 4v/cyl.

[badkuk]

AutoMahn: Mga sir, pakiexplain naman po in layman's terms kung bakit mas matakaw sa gas ang mga DOHC kaysa SOHC. Thanks

afaik, given that displacement is the same, it's really dependent on the number of intake valves you have per cylinder -- not whther it's DOHC or SOHC.

i think ung nagiging misconception is that kung DOHC, mas madami intake valves na kinuclose-open, compared to SOHC(tsikot gurus please verify)


so i guess you really can't say which *OHC engine types really eat up more fuel...you're gonna have to take a closer look at the car specs

[A121]

pano naman po yung mga 12 valve SOHC? 2 valves/ cyl intake, 1 valve/ cyl exhaust??

[ian_rex]

correct. if not sohc, normally kasi ang mga 12V e mga pushrod engines. correct me if im wrong.

[Automahn]

Namention lang kasi ng friend ko dati (who happens to own both a '97 Civic VTi A/T & a 2000 SiR) na mas malakas sa gas yung SiR considering mas luma yung VTi at matic pa. :D

[pajerokid]

Maybe he drives his Si-R more agressively. Pag nag engage kasi yung 3rd VTEC profile, natural mas malakas sa gas