So, one of the things I did on my A4 was eliminate the bypass when I went to FWC.
For context, my electric circulation pump for the antifreeze had a 3/4" hose output, so I upsized the hole in the side plate to accommodate the larger hose. My thought was the low head pressure on the electric pump was no problem and then when the thermostat got to 160° the t-stat would open up. When the t-stat was closed it would just circulate in the block water jacket waiting for the t-stat to open. I used the original gear driven pump for the raw water. This pic shows the bypass blocked off, and the Thatch mod. I ran this for 7 seasons from 2014 to 2022 before I sold the boat.
For context, my electric circulation pump for the antifreeze had a 3/4" hose output, so I upsized the hole in the side plate to accommodate the larger hose. My thought was the low head pressure on the electric pump was no problem and then when the thermostat got to 160° the t-stat would open up. When the t-stat was closed it would just circulate in the block water jacket waiting for the t-stat to open. I used the original gear driven pump for the raw water. This pic shows the bypass blocked off, and the Thatch mod. I ran this for 7 seasons from 2014 to 2022 before I sold the boat.
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