I spent 6hrs with a pin file putting grooves in the Dasa head for baffles. Today I finally got to test it. I think its runs 20F cooler on the intake side. I have a cheap IR temperature read but it didn’t repeat readings. It just is not as “hot to the touch” after installing the baffles.
There are four rows of water passages that I’ve labeled “A” thru “D”.
I baffled row “B” to flow more water thru row “A”. I believe, without the baffle most of the water enters the jacket and flows out of row “B” and row “A” gets very little. I think it’s important to flow water thru row “A” because when the engine rpm exceeds tune pipe design the tune pipe charge no longer cools the piston and heat build up very quickly on WOT runs.
Row “D” is where the exit elbows are. This row is baffle to flow water down it the water jackets (pocket).
I know that the OEM head gasket had 4 holes per cylinder to flow water evenly around the cylinders and my Greater Yamaha head also supported the same 4 holes design. On my ADA head just like the Dasa, this design was eliminated. This kind of reminds me of my last year as a toolmaker doing deep cavity plastic injection molds. Had to design a cooling circute on everyone. It takes about 5 minutes design and day(s) complete.
There are four rows of water passages that I’ve labeled “A” thru “D”.
I baffled row “B” to flow more water thru row “A”. I believe, without the baffle most of the water enters the jacket and flows out of row “B” and row “A” gets very little. I think it’s important to flow water thru row “A” because when the engine rpm exceeds tune pipe design the tune pipe charge no longer cools the piston and heat build up very quickly on WOT runs.
Row “D” is where the exit elbows are. This row is baffle to flow water down it the water jackets (pocket).
I know that the OEM head gasket had 4 holes per cylinder to flow water evenly around the cylinders and my Greater Yamaha head also supported the same 4 holes design. On my ADA head just like the Dasa, this design was eliminated. This kind of reminds me of my last year as a toolmaker doing deep cavity plastic injection molds. Had to design a cooling circute on everyone. It takes about 5 minutes design and day(s) complete.
