I have been reading with interest the subject of water injection for diesels. Further to Marc's comments I would like to add the following ........ 5% water in diesel will damage the fuel pump and injectors by replacing the lubricating properties of the diesel, diesel from your local supplier can have up to 3% free water before it gets to your tank. Add to that a daily change of ambient temperature of 7û F or more, causing condensation inside your fuel tank and you can get over the 5%, most of which can settle out if not disturbed and create another problem of Micro Organisms growing in your tank. Over the years many 'additives' have been flogged to combat water, micro organisms, and system cleaning. The main product used to combat water has been various alcohols. There are several problems with using alcohols, firstly it breaks the water up into different size particles which can still reunite in the fuel system and cause damage, a good example of this is collecting in the injector tips, turning into steam with enough force to blow the end off the injector. Excess alcohol in the diesel can also leed to lubricating problems in the upper cylinder area and increased cylinder temperatures, this over time can cause piston cracking. Adding alcohol has no effect for control or eliminating micro organisms. A harsh solvent called 'toluene', used mainly in paints, is used to clean fuel systems which in very dirty systems will cause filter blocking and low power. It will also damage rubbers, nylons and other plastics which are found in todays fuel systems. I am not against fuel treatments (as opposed to additives), water injection or other technologies. If water was to be injected into the air intake stream, then there would have to be some way to shut off the injection prior to shutting down the engine to prevent cylinder corrosion. Also injection would have to be after the turbo charger (if fitted) to prevent the likely hood of damage to the impellor. Hope my experience and knowledge was of benefit to you all. regards Peter
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