RX8-TX

That just made a lot of sense! Slowly things are starting to make sense....slowly. :p

Thanks again!

RX8-TX

Please follow the link: http://www.installuniversity.com/ins...n_9.012000.htm

Would that be a viable experiment that could be conducted with a CANScan, a stretch of highway and a calculator?

azureknight

i wonder if the fuel inejectors can be placed here for direct injection?

rotarygod

On Racing Beat's Bonneville 3rd gen RX-7, there were 2 spark plugs placed in the rotor housings directly above the peripheral intake ports. In the late '80's/early '90's Mazda played with direct injection on project engines that were nicknamed DISC and DISC II. This stood for Direct Injection Stratified Charge. Their system was very different from the way Racing Beat did their race engine. Mazda had a fuel injector placed between the spark plugs. The catch was that it didn't directly spray into the combustion chamber. There was a small cavity that the injector and one of the spark plugs fired into. The combustion was initially ignited here and then the mixture traveled out into the combustion chamber where it fully interacted with the intake air. Fuel wasn't even seen in the engine until the ignition phase. It totally bypassed the compression phase altogether. This obviously never went anywhere. It seems like a strange way to do it but direct injection has been tried before. It can definitely work but the main problem appears to be the size of the hole in the combustion chamber from the fuel injector. As the apex seal crosses over this point, some air can travel around the apex seal into another chamber since pressures are different between them. This may cause some losses. Racing Beat did theirs on a high rpm race engine that wasn't concerned with low end losses. I would like to see this further developed.

globi

The thing with direct injection is also that fuel has less time to evaporate, so it needs to be injected in very fine 'droplets' (the smaller the droplets the faster they can evaporate) which is obviously not that easy to accomplish otherwise the Diesel guys wouldn't still work on it (after 100 years development time).