Skip the auto shop - Our mechanics make house calls

Q: What Is a Twin-Cam Engine?

asked by on

What is a twin cam engine?

Engines that are considered twin camshaft engines will have individual separate camshafts for the exhaust and intake valves on a cylinder head instead of a single camshaft to operate both the intake and exhaust valves in a cylinder head. The twin cam engine is designated DOHC, or double overhead camshaft.

The double cams allow a cylinder head to use smaller but more valves in the head to increase airflow in and out of a cylinder. The double cam engine in some newer vehicles are using advancing and retarding devices to control the camshaft timing for the intake and exhaust valves separately. This can increase power and fuel efficiency. The camshafts can be advanced or retarded independently using oil pressure, actuators, and sensors to control them. This new style of engines with variable valve timing has enabled manufacturers to meet ever rising mileage standards. The engine horsepower and economy is increased using the DOHC versus the single overhead camshaft (SOHC) engine.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Hesitation before engine starts up.

Hello, do you mean a lag "while" the starter turns the motor over, before it actually starts? Or a lag between turning the key to '"start" and when the starter kicks off? A lag while the starter is turning, but...

Q: Camshaft timing - 2000 Audi A6 V6

I am working on this

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...