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Well-Known Member
Nov 29, 2004
Kuala Lumpur,Malaysia
87 Corolla [EE90], 98 Civic JDM [EK8], no vtec yo
im not sure of this is supposed to be in this section,but i wanna know wats a DOHC and how does it work...i know it stand for Double Overhead Cam.,but wats it for ....and with wat issit related to...just wanna understand engines better...
Moved. :coplight:
Double overhead cam
From Wikipedia, the free encyclopedia.
(Redirected from DOHC)

A double overhead cam (also called a dual overhead cam, DOHC, or "twincam") engine is a type of internal combustion engine where the camshafts that operate the intake and exhaust valves are mounted above the cylinders, and where there are separate camshafts for inlet and exhaust valves. In engines with more than one cylinder bank, such as the V engine, this designation means two camshafts per bank.

Usually the cams operate the valves directly or by a short rocker, as opposed to pushrod engines which have long rods to transfer the movement of the lobes on the camshaft in the engine block to the valves in the cylinder head.

Double camshafts are required in order to have multiple inlet or exhaust valves that are directly actuated. However, not all DOHC engines are multivalve engines - DOHC was common in 2-valve engines for decades before multivalve heads appeared. Today, DOHC is normally synonymous with multivalve, since almost all DOHC engines also have between 3 and 5 valves per cylinder.


The first DOHC engines were 2-valve designs from companies like Peugeot (1913), Alfa Romeo (6C, 1925), Maserati (Tipo 26, 1926), and Bugatti (Type 51, 1931). Most Ferraris used 2-valve DOHC engines as well.

When DOHC technology was introduced in mainstream vehicles, it was common the technology to be heavily advertised. Many mid-1980s Honda products featured "DOHC" plaques, and automakers often used "DOHC" as the engine's name. Most early mainstream DOHCs were 4-cylinder engines as well: Ford's first DOHC motor was the Lotus-reworked Kent (1962), and GM's first was the 1975 Cosworth-tweaked 2300.

See also:

* Overhead camshaft
* Single overhead cam
* Pushrod
Wiki link
andyhui01 said:
DOHC VTEC = :thumbsup: :thumbsup: :thumbsup:

one of the nicest souding engines when the VTEC kicks in ;)

i agree but one other engine that i love to hear over and over again

toyota 1uz-fe with a nice exhaust.
yummy dohc alloy v8 that i can actually afford :D
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