Kal-GTI
Ready to race!
I am curious to see if the Gen 3 TSI will suffer from the same issues that the Gen 1 did regarding carbon build up.
Here are a few interesting tid bits I read regarding Direct Injection Gasoline Engines and carbon build up.
1. "Gasoline engines with direct injection of the fuel into the combustion chamber…suffer especially from the problem of the formation of carbon deposits…especially in the neck region of the intake valves." The application also noted that these carbon build-ups "have extremely negative effects" on the performance of the engine. " From VW
2. GM denies carbon build up. “We maintain great engine function and performance in our all our DI engines through an optimization strategy with our valve events,”
3. Lexus uses a technique that indirectly addresses this issue. They have two sets of injectors. One set is for idle in order to reduce noise. The second is direct injection for performance and economy. In other word, Port and direct Injection
4. Ford also has patented a DI reversion cleaning of the intake valve on the DI engines. Like VVT replacing EGR, Ford is using VVT to allow a timed fuel/air mixture to rinse the intake valve as needed.
IMO, Toyota/Lexus twin injection is the best solution as DI isn't optimum at all rpms/load. IDI has its benefits. And, the combination of the two would be best.
I believe that the elimination of the EGR along with better valve timing would help this issue.
Over time it will be very interesting to see how the gen 3 engine deals with this as VW has know of this issue for almost a decade now.
On another not, the use of the exhaust manifold incorporated in the head is a great design to help maintain thermal efficiency, velocity to allow VW to go to a larger exhaust housing and compressor wheel. They are getting awesome spool with plenty of head room to keep the turbo out of the surge region. Basically they have widened the compressor map which will help the tuners put out strong numbers.
Here are a few interesting tid bits I read regarding Direct Injection Gasoline Engines and carbon build up.
1. "Gasoline engines with direct injection of the fuel into the combustion chamber…suffer especially from the problem of the formation of carbon deposits…especially in the neck region of the intake valves." The application also noted that these carbon build-ups "have extremely negative effects" on the performance of the engine. " From VW
2. GM denies carbon build up. “We maintain great engine function and performance in our all our DI engines through an optimization strategy with our valve events,”
3. Lexus uses a technique that indirectly addresses this issue. They have two sets of injectors. One set is for idle in order to reduce noise. The second is direct injection for performance and economy. In other word, Port and direct Injection
4. Ford also has patented a DI reversion cleaning of the intake valve on the DI engines. Like VVT replacing EGR, Ford is using VVT to allow a timed fuel/air mixture to rinse the intake valve as needed.
IMO, Toyota/Lexus twin injection is the best solution as DI isn't optimum at all rpms/load. IDI has its benefits. And, the combination of the two would be best.
I believe that the elimination of the EGR along with better valve timing would help this issue.
Over time it will be very interesting to see how the gen 3 engine deals with this as VW has know of this issue for almost a decade now.
On another not, the use of the exhaust manifold incorporated in the head is a great design to help maintain thermal efficiency, velocity to allow VW to go to a larger exhaust housing and compressor wheel. They are getting awesome spool with plenty of head room to keep the turbo out of the surge region. Basically they have widened the compressor map which will help the tuners put out strong numbers.
