shariqak1, you have provided very useful information here. Good work. I would like to point out that the Pushrod (OHV) type engines are now primarily produced by American automakers, namely GM and Chrysler. The LS series of V8 engines used in Corvettes and the ubiquitous HEMI engines used across Chrysler and Dodge performance vehicles. The new HEMI V10 that is deployed in the 2008 Dodge Viper also employs Variable Valve Timing with Cam In Cam setup. It produces 600hp @ 6000 RPM and 560 lb-ft of torque at 5100 RPM; naturally aspirated of course.
@ tauseen123:
A motor being an SOHC or a DOHC doesn't define the overall affordability of a Car.
DOHC engines are more expensive to produce than SOHC models. The additional cost involved in producing the DOHC engines is passed on to the consumer in the form of higher vehicle cost. Let me elaborate further; GM’s LS7 V8 is an iconic engine, used in C6, Z06 and the upcoming ZR1 Corvettes. It is a SOHC design. The AMG V8, the first engine completely designed and produced by AMG rather than modifying Mercedes V8’s, is a DOHC design. I will not bore you with the specifications of these two engines; the numbers are quite comparable. The price however is not. The LS7 is US$24,000. The AMG V8 is US$56,000. You can argue that since the AMG V8 is used in more prestigious vehicles, it should cost more. To counter this argument, let’s look at a DOHC design from GM. The new 3.6L Direct Injection VVT V6 produces 304hp at 6700 RPM and 270 lb-ft of torque at 4000 RPM. It is being used in 2008 models from Cadillac. The price of this engine is US$19,000. If you compare the price of each horse power produced, the V6 is considerably more expensive than the SOHC design. The dollar figures I quoted are form the parts departments of respective auto dealers.
@ joji90:
DOHC engines consumes more fuel u can say not fuel efficient engine.
This is not correct at all. DOHC engines are more efficient than SOHC designs. They burn fuel more efficiently because they breathe better than their counterparts across a broader RPM range. You may ask, then why aren’t auto makers using DOHC design in entry level vehicles more often. Because DOHC engines are more complicated to produce, hence they cost more. The selling point of entry level vehicles is not performance, it is the cost of the vehicle.
