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BMW Engine Carbon Cleaning
Many BMW direct injection engines suffer from an excessive carbon build up on the intake valves. The carbon build up can cause drivability issues such as stumbling, flat spots and lack of power, poor throttle response etc. In addition, BMW engine carbon build-up on the intake valves is commonly associated with an inconsistent idle and in some cases, a direct injection engine will not idle at all when cold. In most cases, this will lead to a check engine light and failure to pass emissions.
BMW Intake Valves with Carbon Build Up
Carbon build-up around intake valves in an BMW engine is a sticky coating of oil and fuel constituents. Once formed, it continues to grow further coating the thickness of the deposits and has an extremely negative effect on engine performance. One manufacturer has cited a potential risk for pieces of this carbon to break off and burn holes in the structure of the catalytic converter. This is potentially very destructive and expensive.
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BMW Engine Carbon Cleaning With Walnut Shell Blasting
Rennology Motor Sport provides walnut shell cleaning of BMW direct injection engines. This process safely removes the carbon build up and is significantly less expensive than removing cylinder heads and subsequently cleaning the valves. The process is conducted using a factory approved tool that blasts walnut shell particles directly on to the intake valves. The process removes all of the carbon build up and consistently returns good engine performance. To de-carbon a BMW engines takes less than a day and the results are excellent – throttle response and power return immediately. Call us today for an evaluation or complete the form to the right of the page to ask questions or discuss your BMW carbon build up.
Why Does Carbon Build-up On The Intake Valves?
Most of the very recent engine designs and technical enhancements have greatly reduced the issue of carbon buildup, but it has been a distinct and well-documented issue in most direct injection engines over the last few years.
There’s a lot of discussion as to why and not many straight answers. The bulk of the answer relates to what’s in the air passing through to the intake valves. This air also contains gases recycled from the exhaust and crankcase fumes recycled through an air oil separator. In a regular injection car, the fuel is vaporized ahead of the intake valves into this air mixture and drawn into the cylinders. The vaporizing of the fuel in the air likely grabs those rogue particles from the crankcase fumes and the exhaust gas and they pass into the cylinder to be burnt.
In a direct injection engine, the fuel is vaporized directly into the cylinder. This leaves the air containing the other particles to pass over the hot intake valves and into the cylinder untouched. It seems those particles from the crankcase and exhaust recycling collect on the hot intake valves rather than pass into the cylinder to be burnt. Once this happens, the problem gets worse every time the engine is run and the deposits get larger. Where porting and polishing the intake improves performance, the carbon build up on the intake valves and surrounding ports does the complete opposite. Eventually the engine is starved of available air and performance at all levels is significantly reduced.
It’s Carbon Right? Won’t it just flake off with a cleaner?
While the deposits are carbon, they tend to be both sticky and oily or baked solid. Sometimes, they are so solid even directly scraping them will not remove them. Good gas or bad gas – it makes no difference and no cleaner will remove it. If your BMW engine has started to show signs of carbon build up, call us today to schedule an evaluation and a de-carbon service.
Long Term Solutions to BMW Intake Valve Carbon Build Up?
How to stop the build up of carbon on the intake valves? Unfortunately there is no simple solution to the build up of carbon in direct injection engines. Some of the solutions available can postpone the problem but not eliminate it completely. In addition, most of the solutions leave the engine non-emission compliant and are therefore not recommended for road use.
For off-road use, such as track cars, we recommend the use of an oil catch can. This stops the crankcase vapors from being drawn into the intake and the bulk of the deposits from collecting on the valves. It is not perfect but certainly improves performance and postpones the carbon build up for much longer.
BMW Engine Carbon Cleaning – Two Chicago Area Locations
Rennology Motor Sport has two BMW repair shops in Chicago Land – one located in Oak Forest near the Orland Park area and one in North Aurora near Naperville – both offer BMW engine carbon cleaning services as well as repairs, factory scheduled maintenance, tuning and performance upgrades for BMW vehicles.