Wednesday, February 4, 2015
DOHC VS SOHC The advantages
Once upon a time , the extent of the engine cylinder head technology OHV ( Overhead Valve ) . At that time , the placement of the camshaft is under the valve and is considered less efficient . Later developed into a SOHC ( Single Over Head Camshaft ) with the camshaft position below , now moved to the top . Finally, the latest technology DOHC ( Double Overhead Camshaft ) .
As the name implies , this engine has two camshafts camshaft or other designations -as each has its own gear and pulleys connected with a crutch-as .
Both of these technologies are still widely used , even though in the car category . But , who is actually superior ?
Each manufacturer has its own reasons . But , it does not mean losing a single double . After all , there are other technologies to help improve performance . Likewise DOHC ECU can still be set if the right target fuel efficiency .
DOHC engine has a typical gross appearance of a relatively wider than the SOHC . But can not mention heavier . For very dependent on the weight of each component there ." In the specification machine , if it is more efficient SOHC and DOHC engine more powerful . , But with the other technological advances , DOHC engine can also compensate for inefficient SOHC engine , " said Bambang Suroyo , Suzuki workshop head goddess Sartika , East Jakarta .
To move the spring and valve , SOHC engine uses the rocker arm or trigger. Different than the DOHC , which of the camshaft directly suppress the ring and the subsequent per valve .
" So if the calculated mechanical motion , more than DOHC SOHC , " added Surya Swasono Taqwa , owner of the shop Garden Speed in Cilandak , South Jakarta . With the use of rocker arm , made by valve on the machine does not need to be too hard . Unlike the DOHC engine that has a per valve louder .
The use of only one camshaft that makes the engine more efficient than DOHC SOHC . "For a little opening so that air and fuel entering too little , compared DOHC open more . , But with DOHC , more power and when juxtaposed with VVT technology , it could still fuel efficient as well , " Bambang added .
Suzuki gave the name VVT , being there for the Toyota VVT - i , and even developed into a dual VVT - i . Honda itself has a designation VTEC and i - VTECFor SOHC version , usually has the external appearance is more slender than SOHC . The form is concise so as not taking up too much space .
" One of the considerations in several types of fixed SOHC Honda is for fuel efficiency . Keeping track of the world who also go green , " said Julian Karfili , Public Relations Assistant Manager of PT Honda Prospect Motor . Well , for the pursuit of performance or power , will stay regulating other aspects such as gear ratios , or with the addition of ECU mapping component . Like the Honda torque boost resonator which rely on the Honda Jazz and the Mobilio.
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