Do your Coolant temps and AIT's a favor

[RETed]

Originally Posted by classicauto

Rather, that exhaust is still getting around the sleeve itself and thereby heating that entire aluminum portion surrounding it (which is cooled by the jackets). Despite the fact that it can't get out of that chamber now since you plugged it - that portion of the AL on the housing is being blasted with exhaust.



I tried to minimize it by welding shut those holes in the sleeve, but the leading edge of the sleeve still doesn't seal against the housing and until it can, gas will still go around (a bit...)

Yep, despite his limited intelligence, he still can't quite grasp the idea of exhaust gases getting around the exhaust sleeve...literally.
Mazda designed the exhaust sleeve so that exhaust gases can get around it, hence, my statement about that particular fact earlier.
I bet there's more exhaust gas entering the leading edge of the exhaust sleeve versus the two holes on the "ceiling" of the exhaust sleeve itself.
The exhaust gas vector is more apt to enter that way.
Keep in mind that in most set-up's, there's also a scavaging effect downstream (from the other rotor) causing a negative pressure area that makes it even harder for the exhaust gases to enter those two holes.

If he's bitching about how much exhaust gases are getting past even with his plugged holes inside the exhaust sleeve, why bother plugging the two holes in the first place?


-Ted