Road Test of Stant vs. Shewman Thermostats

[Old Henry]

Originally Posted by 34PKUP

"THIS TEST WAS ONLY OF SHEWMAN'S STATS FOR THE 59A ENGINE NOT THE ONES FOR THE 8BA"
Really?

Really. Although they both start with the same stat, they are modified very differently for the two different applications. What Shewman has done is taken the Robertshaw 330 stats, that are perfect for the 8ba engine, and drilled holes in them for that engine which is most likely going to make it run cold in the winter and adds nothing for the summer since, once the stats open in an 8ba, the water flow is unlimited by the stat. Then, for the 59A, since the stats mount differently than for the 8ba, he trimmed off the stat flange, after drilling the holes in it, and brazed a tube onto it to hold it in the upper radiator hose just where it goes into the radiator. That's the real rub since the cup that moves out of the way of the water flow in the 8ba just stays in the way in the hose of the 59a. Two very different applications for which Shewman tried to make one thermostat work.

So, for allowing the highest water flow at high temperatures in the 59a, Shewman's stats can't be beat. For fast warm up, particularly in cold weather, the stock Robertshaw (without the holes drilled in it) would be better. For 59a, Shewman's stats have no advantages, only disadvantages.