Post 22 May 2017, 21:41

1988.

Rather than me writing a long argument about indirect chambers. Let me point the technical people who are still viewing, to the work of Dr Dan Merritt [UK] and his lean burn technology. This is something I came across inIf you take the time to read his notes, you will probably have a different view on the indirect chamber and what topology to select. Highly atomised fuel drops do not need to be spread out in the pre-chamber. In fact it is a disadvantage. My screen name was chosen to reflect my thoughts, about tumble and stratification. The latest Patents on the TJI principle look at intense swirl in a chamber that is very different to anything seen or suggested here. This also links into what might be a good main chamber topology - Excess air and keeping fuel away from cylinder walls. Merritt shows a method of creating a vortex swirl via a 'ramp shape', and the results. There was much discussion, back in the sensible days of the main thread, about stratification, and I think that a vortex injection from the pre-chamber is a better way to this end. The 'hose pipe' method seems intuitively wrong. The other issue is the problem of increased efficiency leading to lower exhaust temps and the effect on MGU-H/Turbo - change the pre-chamber/main chamber then affect downstream - reprogram and back to the beginning again. Thinking that just changing a few castings and off we go in a few weeks, is cloud cuckoo land for Honda or anybody.Whilst the web link is substantially about lower emissions and improved fuel consumption, there are some lessons to be had.