Why Does Engine Size Affect Car Insurance Costs?

When you are searching for a car insurance quote one of the single biggest factors in determining the cost is the size of the engine of the car. But why does this make such a huge impact on the cost? A lot of people ask questions such as: does car insurance cost more by engine size? Well read on to find out why engine size affects insurance.

What Is Engine Size?

The size of a car engine is worked out by multiplying the volume of one cylinder of the car engine by the amount of cylinders it contains. For example if we take a typical 2.0 litre engine it might consist of: 500cc per cylinder x 4 cylinders = 2.0L. In general terms a larger engine will consume more fuel than a smaller engine over the same distance traveled. A diesel engine will produce less power than its petrol equivalent therefor using less fuel.

The Theory

The theory behind engine size and insurance cost comes down to a simple concept that the insurance companies believe that the people who will be buying vehicles with a larger engine size will be looking to drive their cars faster and more dangerously and therefor resulting in more accidents and claims. They believe that the larger engine size will appeal to the "boy racer" stereotype who are more likely to make claims.

Scale Showing How Engine Size Affects Car Insurance Cost

The Reality

The reality is that the statistics prove that vehicles with a larger Engine have more frequent claims and payouts on their insurance and as far as the insurance companies are concerned this is all that matters. Why is it that 18 year olds have consistently larger payouts? The answer doesn't matter because the raw data shows that they do so their insurance premiums are higher to compensate for this. Why do cars with larger meninges have higher payout costs? The answer is unimportant because the stats show they do so their insurance costs are higher.

Larger Engines Cost More To Replace

Another factor leading to larger engines having higher insurance quotes is the fact that bigger engines are more expensive to replace. Why do they cost more to replace?Vehicles with bigger motors are often high performance and luxury cars that are expensive to repair and to replace. This forces the insurance provider to charge more as they will have bigger bills themselves when it comes to dealing with claims for these cars. So taking all this into account this is why engine size affects car insurance cost.


Another point worth noting is that cars with a smaller engine will pay less in tax as they are more friendly for the environment than the larger engine cars.

Common Engine Sizes Of Popular Vehicles In The UK

Polo: 1.0 - 1.4L
Golf: 1.4 - 2.0L
Beetle: 2.0L

1 Series: 1.6 - 2.0L
3 Series: 1.4 - 3.0L
5 Series: 2.0 - 3.0L

KA: 1.3 - 1.6L
Focus: 1.6 - 2.0L
Mondeo: 1.7 - 2.0L
Fiesta: 1.0 - 1.6L

3.0 - 5.0L

Aston Martin
3.0 - 5.0L

2.0 - 4.0L