SOHC Vs. DOHC – Which Engine Is Better?

SOHC or DOHC- The confusion may spin your head.
But, before moving forward and clearing your doubts,
It should be clear that these engine types have several pros and cons
That makes them distinctive from one another.

Both SOHC and DOHC have managed to gather the limelight for their superior
Performance when it comes to engine efficiency. But to help you choose better,
We have listed out certain factors that will help you make a better choice when SOHC vs. DOHC is in question.

Definitions Of SOHC And DOHC

What Is a SOHC Engine?

SOHC stands for Single Overhead Cam
(Only one cam rod operating the intake and exhaust valves). That means there is only one camshaft in the head. Inline engines will have one camshaft. Flat engine and V-engine will have two camshafts, one per cylinder bank.

What Is a DOHC Engine?

DOHC stands for Dual Overhead Cam or Double Overhead cam
(There are two cams located overhead operating various intake and exhaust valves). That means each header has two camshafts. Hence, an inline engine will contain 2 camshafts as it has only one header. Flat engine and V-engine will contain 4 camshafts as they have two headers. The DOHC engines usually come in 4 valves. One camshaft for the intake valves and the other for the exhaust valves.

Also, read – Difference Between Crankshaft And Camshaft

SOHC vs. DOHC – Which One Makes For A Better Choice?

Each type has its features that make them unique and distinctive from one another. Let’s look for the difference between SOHC and DOHC in detail.
So, to help you make a better choice.

1. Operation

A SOHC is simply a single camshaft regulating both the inlet and the
Outlet of gases and DOHC is double camshaft that has a
Dedicated setup for inlet and outlet of gases. This further implies that a DOHC has
Double inlet and exhaust valves as compared to SOHC. Thus, this makes for a cooler
Engine with equal distribution of operations,
Which, in turn, leads to a smooth, noise-free and effective ride experience.

2. Valve Timing

Valves are known to activate the working of the engine.
And, the timing of the intake and the outtake of the gases depends on the
Shape and the angle of the camshaft.
When that breathing process needs to be optimized variable valve timing is required,
Which in turn, also enhances the maximum horsepower attained.
It is known that SOHC designs have less control over valve timing as
Compared to DOHC, owing to the single camshaft availability,
Making DOHC more flexible in terms of tuning.


3. Fuel Efficiency

As discussed a DOHC has a double setup of valves per head. This, in turn, implies that
More power would be consumed owing to the enhanced control over the valves. And, more the power is fuel consumption. Thus, when talking in terms of SOHC vs. DOHC fuel efficiency, a SOHC is more fuel-efficient. But, it should be known that it is the
Skills of a driver and the design of the engine that can make a
DOHC engine reflects fuel efficiency. You could look for maintenance tips that can help
You learn how to manage engine efficiency well.

Also, read – Carburetor Vs Fuel Injection: Which One Is The Better Option?

Fuel Efficiency of SOHC and DOHC
Technology Used by Successwful Businesses

4. Price

When the question” What is SOHC” comes to your mind,
Just know that it has a single rotating cylindrical rod
That regulates the intake and the exit of gases. This calls for affordability over DOHC which has distinctive setup for
Both the incoming and outgoing of gases.
A DOHC has double the valves as compared to SOHC,
Which makes it a less complicated design and thus cheaper than its counterpart.

SOHC vs. DOHC- Which is reasonable?


Having looked at the perspectives of the two engine types,
You must have got a clearer perspective on SOHC vs. DOHC.
Also, one should know that both SOHC and DOHC has
Its advantages and disadvantages,
But when it comes to choosing a better option keeping in mind the market trends,
It would undoubtedly be DOHC.

Ekster EU


  1. Frans Oxurub April 19, 2020 Reply
  2. Tabingwa Sharuk January 3, 2020 Reply

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