The guys at Mazdatrix probably covered this already but if nothing else
turns up, consider the possibility that oil foaming could be the cause of
the pressure drop.  Usually it occures around 4500 rpm and only about a 10 -
20 psi drop but every situation can be different.  I use an anti foaming
tray in the oil pan (part of my engine mount )and it eliminated the pressure
drop completely.  I'd check out the other possibilities first though.

Tracy Crook

Bulent Aliev wrote:

That was the first thing crossed my mind too. I was thinking of installing
stainless steel screen on top of the holes of the aluminum mount plate, to
help with the separating the foam from the oil.
Bulent

 
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