12


2018.04.02

Hi Paul,

the "appendage" shows the change in volume upstream + downstream of the
short axis with a "large recess" (+ low CR).

Assuming you have a flat + long recess like the old F+S or OMC engines + a
homogeneous mixture.

You will have a relatively large volume upstream of the short axis. There's
no other way to get the gas of the T section into the leading section +
finally to the exhaust port, than "pushing" it past the waist at the short
axis.

If you initiate a "violent" fire / combustion at the T section, all that hot
burning mixture has to flow to the leading part of the chamber + for that it
has to pass the "narrow area".

The burning mass will get in Very Good Contact with the sliding surface /
wall, thus loosing a lot of heat. Also the housing will be stressed near the
short axis. You have to intensify the cooling.

The more (burning) mixture the T section contains, the more heat loss one
will see.

Increasing the volume of the recess even more will decrease the CR, s.th.
you should avoid.

One strategy can be, to reduce the volume in the T section as far as
possible + to transfer the trailing amount of mixture as early as possible
to the L section, where combustion conditions are far more preferable (SV
ratio will get better with each degree).

Enclosed you can find a patent by Mazda. Goal was to reduce the amount of
mixture upstream the short axis / in T section as much as possible + thus to
reduce the amount of unburned fuel / HC.

I'm pretty sure, that Mazda has applied the formula of the patent to their
engines.

Best regards

Frank Herfert


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