Honda 1.5T L15B7/Si Turbo Engine Specs, Problems & Reliability

Honda 1.5T L15B7/Si Turbo Engine

Here in this post, I have gathered information about the Honda 1.5T L15B7/Si Turbo Engine from its official website, including its specifications, Problems, and Reliability.

We believe in providing reliable information to our readers, therefore we prefer to obtain information on the Honda 1.5T L15B7/Si Turbo Engine from authentic sources.

This article, which has been updated, has all the information you require about the Honda 1.5T L15B7/Si Turbo Engine.

Inaugurated for the first time in the 2016 Honda Civic, the L15B7 is a 1.5-litre inline-4 turbocharged gasoline direct-injection engine.
Honda 1.5T L15B7/Si Turbo Engine
Honda used a downsizing approach in which smaller displacement units were paired with a turbocharger to solve the power issue, resulting in this engine.
So, the 1.5L turbo engine offers great fuel economy while also producing respectable power and torque that surpasses that of a naturally aspirated 2.4L engine.
The 1.5T engine has already been made available for the Honda CR-V and the Honda Accord, both of which are relatively hefty vehicles.
Compression Ratio
Fuel type
Fuel system
Direct fuel injection
Honda Motor Company
Production years
Cylinder block material
Cylinder head material
Fuel type
Number of cylinders
Valves per cylinder
Valvetrain layout
Honda Civic turbo, Honda Civic Si, Honda Civic Hatchback Sport/Touring, Honda CR-V, Honda Accord, Acura CDX
Oil change interval, mile
9,000 (15,000 km) or 12 month
Engine oil capacity, litre
3.5 l (3.7 qt)
0.28 l (0.3 qt) – oil filter
Engine oil weight
SAE 0W-20
Firing order
Torque, lb-ft
162-192 lb-ft (220-260 Nm)/ 1,600-5,000
Power, hp
174-205 hp (130-153 kW)/ 5,500-6,000
Compression Ratio
Type of internal combustion engine
Four-stroke, turbocharged
Displacement, cc
1,498 cc (91.4 cu in)
Stroke, mm
89.5 mm (3.52 in)
Bore, mm
73.0 mm (2.87 in)

Honda 1.5T L15B7/Si Turbo Engine Problem And Solutions

Oil Diluting in the Honda 1.5T Engine

On the Honda L15B7 engine, the question of how much fuel dilutes the oil is an intriguing one. Please be aware that some fuel dilution is normal and happens in all engines.

However, there are situations where the oil in a Honda 1.5 Turbo becomes overly diluted. Specifically, 1.5T engines have this issue in colder climates.

Fuel is more likely to cling to the cylinder walls in a cold engine.

The motor oil will then absorb it. Despite their efficiency, Honda 1.5 Turbo engines are notoriously slow to reach operating temperature.

Because of this, fuel dilution issues are more prevalent in colder climates and on shorter trips.

There are a number of problems with this. Apparently, the dilution is causing some people to experience halting, misfiring, and power loss.

.However, the 1.5-liter turbo engine’s long-term dependability is threatened by the fuel dilution of engine oil. When there’s an excess of gasoline in the oil, it loses some of its lubricating properties.

The internal components of a Honda 1.5T engine could experience additional stress and wear as a result.

Honda’s extended warranty covered the vehicle for another year and was not limited in terms of mileage.

Having some additional protection is never a bad idea. However, interior wear frequently doesn’t become apparent until years later. Honda also released software patches to assist with the 1.5 turbo fuel dilution issues. 

How to Keep Fuel from Making Oil Dirty

When the engine is cold, the fuel is more likely to adhere to the cold cylinder walls, leading to higher dilution.

It also occurs when the engine is left idling for too long and the internal temperature drops rapidly.

When warming up a turbo engine, it is best to take it easy on the gas pedal.

Finally, you may want to consider a Honda 1.5 Turbo oil change sooner than the recommended 9,000 miles.

A buildup of carbon in a Honda 1.5 Turbo

The L15B7’s carbon accumulation mechanism is largely unclear at this time.

Direct-injected (DI) engines are susceptible to carbon deposits on the intake valves; however, this is to be expected over time. As such, it is a major drawback of DI engines.

Fuel is not entering the cylinder through the intake ports because it is sprayed straight into the cylinder.

Oil blow-by is a normal byproduct of engine operation. Some oil gets through the intake filters and onto the intake valves. Injecting fuel via the port provides a spray of fuel to clean the intake valves.

Unfortunately, oil builds up on DI engine valves over time because no fuel is actually hitting them.

How much residue is accumulated is dependent on how efficiently the Honda 1.5 Turbo controls and minimizes oil blow-by.

Since the direct injection is relatively new to Honda engines, there are likely still some issues that need to be worked out. As with any DI engine, carbon buildup is inevitable.

At either 60,000 or 120,000 miles, 1.5T issues will become apparent.

Over time, the oil deposits harden and reduce the amount of air that can flow into the Honda 1.5T’s engine.

Once significant carbon deposits form, driving becomes extremely difficult. Some of the most noticeable signs of carbon buildup in a Honda 1.5 Turbo are a stuttering engine and a harsh idle.

Stuttering or reluctance during acceleration is also possible. Another sign is a decrease in power since the cylinders aren’t getting as much air.

Carbon deposits, on the other hand, take a long time to build, thus the resulting power loss is probably imperceptible.

How to stop carbon buildup in a Honda 1.5T

In most cases, walnut blasting is the most effective approach for removing carbon deposits from intake valves. It’s a lot of work, yet you just need a few simple tools and no fancy materials.

The cost of walnut blasting 1.5 Turbo engines ranges between $300 and $600.

Some people may choose to ignore the indications of carbon buildup because they don’t consider cleaning the intake valves to be an emergency repair.

However, when the time comes, it’s a good idea to clean the intake valves to keep the vehicle driveable.

Honda 1.5T L15B7/Si Turbo Engine Reliability

I was wondering how dependable the Honda 1.5T engine is. Yes, the engine is often rather dependable.

In terms of dependability, the Honda 1.5 Turbo receives above-average grades from us. Time will tell how well this engine holds up over the long haul, as it is still relatively new.

There are a few minor issues with the 1.5T motor that don’t really matter in the grand scheme of things.

Oil dilution can shorten the life of a 1.5 turbo, therefore it’s crucial to be careful while adding it. To sum up, the Honda 1.5T is a rock-solid, dependable motor.

However, turbocharged engines require slightly more work in terms of routine maintenance for drivers who aren’t accustomed to them.

Spark plugs and ignition coils can take a bit more abuse from turbochargers.

Moreover, it increases the total amount of hardware in the engine, any of which could break down.

Even so, if you take care of your Honda 1.5 Turbo, you shouldn’t have any problems with it lasting for a lot more than 200,000 miles.

Reduce the time between oil changes if your vehicle is suffering fuel dilution. Maintenance is key, as is fixing issues as soon as possible.

If you follow these steps, you’ll have a far better chance of having a dependable experience with the 1.5T.

Honda 1.5T L15B7/Si Turbo Engine Review 

Honda’s 1.5-liter turbocharged 4-cylinder 1.5T L15B7/Si Turbo was launched in 2016. The Honda Civic is the first vehicle in the United States to offer a turbocharged engine. This engine is also found in the Honda CR-V and Honda Accord. For a full review, please check this YouTube video Here.

Honda 1.5T L15B7/Si Turbo Engine FAQ

How much HP can a L15B7 handle?

About 375 wheel horsepower is our general answer for the engine. This is about the most a stock L15B7 engine can safely handle.

This is not a hard-and-fast rule. We’ve seen engines shut down before they reached that level of power, and we’ve seen very few of them go above that level.

It can last 150,000 miles or more, depending on how well you take care of it. But, like any other part of a car, their engines could break down before they reach 100,000 miles.

Does the L15B7 have VTEC?

Civic’s 11th generation (2022-present)
The latest 1.5-litre turbo (L15B7 with VTEC®) powers the new 11th-generation Civic Sedan EX and Touring, as well as the Civic Hatchback EX-L and Sport Touring.

What is Honda’s strongest engine?

That would be the F20C, which was made for the Honda S2000 roadster with rear-wheel drive.

The 2.0L F20C was designed for racing and produced an incredible 240hp, making it one of the most powerful production engines ever produced. 

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8 months ago

I heard that head gasket is an issue on the L15b7, is it true ?