5

Looking at the market, VW has built the VW XL1 (EN, DE), a hybrid car with up to 260mpg. The german site says there was a test drive on the street where the car indeed consumed 0.89l diesel /100km, which equals 240mpg. But there are also many other confusing numbers, giving up to twice the consumption. I also find 1.82 l/100km with full and 1.94l/100km with ...


4

Homogeneous Operation Fuel is injected during the intake stroke. This mode of operation is similar to port-injection in that air and fuel are mixed homogeneously to achieve a stoichiometric ratio, albeit with some important differences: There is no mixing of air and fuel across the intake valve. In vanilla GDI setups, the fuel is injected directly into ...


2

So, the IS350 actually utilizes both port and direct injection. This results in the IS350 having fewer carbon build-up problems than the IS250, which exclusively uses direct injection. The dealer/shop procedure for this maintenance is, at best, to inspect the valves for build up. If you want to maintenance the vehicle as recommended by Lexus, take it to the ...


2

No. The intake valves sit in the path of the intake air. The only oil it is supposed to see is whatever is routed back to the intake tract via crankcase ventilation, which will be combusted and sent through the exhaust anyway.


1

My understanding is the reason DI engines get carbon build-up on the intake valves is because the fuel (with it's detergent package) get sprayed directly into the cylinder, not on the back of the intake valve like in a "normal" engine. So, adding a cleaner will get injected exactly the same way (giving the intake valve a miss) and will likely not have much ...


1

A good colour is a light grey - I spent a lot of time tuning the jets on the carbs on my v8 to get the mixture just right...


1

The claim is suspicious, to say the least. Replacing just the fuel injection system only allows you to do so much. A modern petrol engine has a peak efficiency of maybe 30% (and that's optimistic). I.e. 30% of the energy in the fuel is converted to motion. The rest is dissipated as heat by the cooling system and the exhaust. Achieving 100 mpg would mean ...


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