Lynn,

      I have heard that would be advantagous to connect the pressure cap to the input
 side of the water pump to reduce system pressure on the press. cap. What is your
 opinion?

    Kelly Troyer

I have never seen that connection, and don't see the advantage. Smokey Yanuk and Carrol Smith both favor top water bleeds near what they had determined to be hot spots or areas that collected air bubbles. These would be small lines with jet sized restrictors installed to control flow. But in both cases the flow was back to the top of a swirl pot or make up tank. The water pressure inside the block can be very high. I had a friend using my dyno one day, and he had a pressure gage installed at the rear of an MGB block. (Think farm tractor with really bad rods) at full tilt 7,000 RPM he had 38 PSI in the block. So if you run a top water bleed you have to keep the flow rate down or you will trip the 16 or 22 pound pressure cap on your swirl pot and keep dumping coolant overboard even though there is no other cooling problem. The stock Mazda make up bottle at just over a quart is exactly enough volume to maintain the system at 16 PSI. The bottle is not exposed to the pressu!

re inside

the block so I have been won
dering what it is on the rotary. I will include such a measurement along with the temp probe between the spark plugs for next season.
Lynn E. Hanover

 
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