a nice simulation

http://m.youtube.com/watch?v=3F_0PvbKo44

Makes interesting viewing

Seen this before Dan and other similar stuff, but isn`t it depressing to see how much short-circuiting happens! It occurs quite low down, straight from the transfers, so perhaps raising the ex-port floor would help here. Amazing images produced by CFD simulation, true 3-D, unlike the things I play with that are 1-D and can`t predict what happens when gas moves from the 3-D of the cylinder to the 1-D port interface and back again to the 3-D of the duct. You need a lot of time and computing power and code skills to be able to analyse a complete engine run with CFD, but who knows, we may be able to get our hands on it in the future? But can you imagine the time it would take to predict a whole power band range with rising rpm in CFD, and then adjust one parameter and do the whole thing again, and again, and again?
Too many other distractions I fear.

Trevor

To My mind. It made the case for air only transfers and an injector in the head, only opening once the exhaust is closed,

Nice idea Dan, how would your scheme provide for lubrication?

Trevor

Dry sump bottomend wth normal oil I guess, transfers having nothing to do with thecrank, could be almost reeds into the open , a bit like gills!

Wow, yea, I can see where your coming from now Dan! Put the reeds in the head, timed with fuel injection, dispense with the transfers, have valve control of the exhaust port and then double the cycle sequences, positive wet sump lubrication with oil cooling jets to the under side of the piston? CPU keeping every thing co-ordinated, and one of Nigel`s CVT units! Oh, don`t you just love it when a plan comes together!

Trevor