At EPO the gas exiting the cylinder is entirely combustion by products and is hot as hell - we see 650* in the header.
At BDC we have an increasingly larger amount of raw fuel/air mixture being overscavenged directly from the case via the transfers.
This overscavenged mixture is cold and if done right it never exits into the header,there simply isnt time for it to be drawn down the pipe diffuser.
We see the result of bad short circuiting ( from port linking for example ) where the egt drops badly and no amount of rejetting will pull this up.
Thus the air/fuel mixture is surrounded by the duct wall, and any temp differential will try to attain equilibrium.
If the wall is hotter than the gas, it will heat the gas, made easyer by the fact that for some period of time the gas must be gradually slowing down,
then sitting still, then slowly accelerating again in the opposite direction ( as a pendulum does at each stroke extreme ).
Whatever the real dynamics of the system,the cooling water must have much less effect on the heat exchange process .
It aint over till the fat lady sings on the dyno,so the test will probably raise even more conjecture no matter what the result.
Unlike our still absent Ryger friend Luc, real dyno graphs will be published on here immediately.
Ive got a thing thats unique and new.To prove it I'll have the last laugh on you.Cause instead of one head I got two.And you know two heads are better than one.
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