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HILLSIDE MOTOR WORKS

INDEPENDENT SERVICE AND REPAIR CENTRE FOR YOUR BMW AND MERCEDES VEHICLES

Modern engines are often direct injection, as this process allows for advantages in fuel consumption as compared to conventional fuel injection, as well as yielding more power with an engine of identical displacement. However, the disadvantage of this is that the regular bathing and therefor cleaning of the intake valves by way of the fuel that they are exposed to does not happen any more. The intake valves are only in contact with air or rather blowby gases from the crankcase breathing circuit, in which substantial quantities of fuel and oil can be found. Over time, these lead to deposits of carbonised fuel and oil in the intake tract as well as on the intake valves themselves; this is also referred to as carbonising.

This is not immediately bad for the engine, but over time can have a detrimental effect on its efficiency. If the valves are heavily carbonised, they may not close properly anymore, and symptoms such as a bumpy idle, vibrations and diminished throttle response can be observed; it may also contribute to increased oil consumption.

As unfortunately this carbonising effect is an inevitable byproduct of direct injection, it cannot be prevented. The use of additives in the fuel itself is useless, as (see above) the fuel does not come into contact with the intake tract or the valves at all; the use of water/methanol injection may slow down the carbonising somewhat (depending on where the methanol is injected and provided it is not yet completely vaporised when it reaches the valves), but cannot prevent it either. A cleaning of the intake valves by using Seafoam or similar products which are injected directly into the charge pipe has been discussed extensively, but equally this method is not very efficient as the carbonising is usually too persistent to be removed by this method.

01959 533359

The advantages of this method are obvious: on the one hand, a labour extensive removal of the cylinder head is unnecessary, on the other hand the method is very fast (only a few seconds per intake tract are necessary) and effective. What are the improvements from Walnut Blasting?

This is the question that interests everyone, but to put it short: Yes! You feel a difference. If you vehicle is more than 3 years old you will almost certiantly notice that the throttle response of the car is noticeably better (without hesitation), and the idle will be as smooth as it was when the car was brand new. There should also be a slight difference in engine power.

Many of our customers can recommend this without any reservation for any car with a mileage of more than 30,000 miles.

Help your car engine breath better, book a Walnut Blast with Hillside Coach Works today!

SPECIALIST

SERVICES

In principle there are two methods of cleaning the intake valves and intake tracts of any direct injection engine. A very elaborate and consequently expensive method is to completely take off the cylinder head and to have the valves lie in a very aggressive cleaning solution for at least 48 hours, after which they have to be cleaned manually as well in order to remove any remaining carbonising.The other method is the cleaning of the intake tract and valve of each cylinder with a blasting tool... This is where our new facilities come in! Our blasting tool uses pressurised air (usually 6-8 bar) to inject fine walnut shell granules into the intake tract. These granules hit the carbon dust at high speed and thus remove it entirely, while at the same time this material is soft enough not to damage the metal of the intake tract and the valves. That is also the reason why no other material should be used for

WALNUT SHELL

BLASTING

WALNUT SHELL BLASTING

Have your intake valves cleaned with our specialist walnut shell blasting tool!

So what are the benefits of having this service carried out .

BEFORE

AFTER

SO WHAT CAN BE DONE TO

FIX THIS PROBLEM?

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