ghinckley68 Posted October 10, 2012 Report Share Posted October 10, 2012 Any one ever started a tread to do this with the jet valve heads, already have a hole? Link to comment Share on other sites More sharing options...
NotStock88 Posted October 10, 2012 Report Share Posted October 10, 2012 Tdi is for turbodiesel design Link to comment Share on other sites More sharing options...
spoon32 Posted October 10, 2012 Report Share Posted October 10, 2012 (edited) I have considered that exact possibility of retro-fitting the jet valve holes for use with a DI system. There is really no reason it is impossible, however there are lots of reasons for it to be EXTREMELY difficult.1. The proximity of the jet valve openings to the valvetrain makes finding clearance for injectors abit of work.2. You will need an almost completely custom valve cover.3. DI systems run at extremely high fuel pressures, in the 1000's of psi for some systems...... obviously the pump and lines will need reworked for that.4. Although not needed, typically the tops of the pistons have a sort of "ramp" formed into them to swirl the fuel when injected into the chamber. I imagine the system will work without this but the efficiency loss would be noticeable.5. If it could be designed to fit injectors around the valvetrain, there is still the task of creating a proper seal to prevent blowout from the combustion pressures and heat. I'd still love to give it a try, but for the time I'm satisfied with my sequential injection and ignition setup. Edited October 10, 2012 by spoon32 Link to comment Share on other sites More sharing options...
ghinckley68 Posted October 10, 2012 Author Report Share Posted October 10, 2012 your are correct in VW terms but..... not a VW Link to comment Share on other sites More sharing options...
ghinckley68 Posted October 10, 2012 Author Report Share Posted October 10, 2012 I have considered that exact possibility of retro-fitting the jet valve holes for use with a DI system. There is really no reason it is impossible, however there are lots of reasons for it to be EXTREMELY difficult.1. The proximity of the jet valve openings to the valvetrain makes finding clearance for injectors abit of work.2. You will need an almost completely custom valve cover.3. DI systems run at extremely high fuel pressures, in the 1000's of psi for some systems...... obviously the pump and lines will need reworked for that.4. Although not needed, typically the tops of the pistons have a sort of "ramp" formed into them to swirl the fuel when injected into the chamber. I imagine the system will work without this but the efficiency loss would be noticeable.5. If it could be designed to fit injectors around the valvetrain, there is still the task of creating a proper seal to prevent blowout from the combustion pressures and heat. I'd still love to give it a try, but for the time I'm satisfied with my sequential injection and ignition setup. Actually mopar guys have been grinding swirl groves in the roof of the wedge heads for over a decade to get swirl. Same could be done on ours only need to create a disturbance to get the air to start swirling Link to comment Share on other sites More sharing options...
Bag-O-Chips Posted October 10, 2012 Report Share Posted October 10, 2012 good concept, but just not cost effective for the prehistoric G54 Link to comment Share on other sites More sharing options...
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