Quote:
Originally Posted by racprops
That is not what they said:
"Transonic Combustion or TSCi™; this combustion process is based on the direct injection of fuel into the cylinder as a supercritical fluid. Supercritical fuel achieves rapid mixing with the contents of the cylinder and after a short delay period spontaneous ignition occurs at multiple locations."
"direct injection of fuel into the cylinder as a supercritical fluid" does not read a vapor, it may have converted to vapor once in the cylinder..
So again all those 4/6/8 high pressure lines running super hot fuel still scare me.
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The gasoline is injected as a super-critical fluid. The science of super-critical fluids is that the diffusion rate is so rapid, evaporation is complete before combustion can occur. Look at the photographs of their injector versus a regular injector. Within a few millimeters of injection the droplet plume disappears. Compare this to common injection where the cloud is visible all across the combustion chamber.
Are you familiar with diesel injectors or direct gasoline injectors? Those are high pressure situations that are handled safely, by millions of vehicles, on a daily basis. I've seen low pressure ( 60 psi and less ) cause just as much fire issues as these high pressure systems. Your fear is unfounded. Carburetors have far more fire hazard than fuel injection.
Are you familiar with the old white gas camping stoves? The one where you pour in the gas into the fuel tank, pump it up to pressurize it and then light the burner? The feed line runs through the burner to heat and vaporize the fuel so that it hits the combustion zone and instantly ( for all intents and purposes ) mixes and burns. No fear of fire here. I let my 8 year old son ( at the time ) operate it safely.
One of the problems of current GDI engines is the fine soot they produce as late injection within the cylinders results in a lack of time to vaporize and properly combust the fuel mix - thus the particulates. The same is true in diesels. The Transonic engine could meet Tier II Bin5 levels of emissions without after treatment. That proves vaporization before combustion.