Detale, DamnCager and Kups650, thanks a lot for your posts, and I'm glad you like your units.
Okay, I have done a lot of testing, and I have a lot of engine temperature numbers for everyone.
If you can't stand all of the numbers, here is the condensed version: The Right Cylinder temperature is approximately 70 degrees hotter than the sump temperature, and the Left Cylinder is approximately 30 degrees cooler than the Right Cylinder. And, I still think that you should not allow the sump temperature to get above 260.
Now the long version:
Sump temperature was measured using a ThermoDipStick. Cylinder temperatures were measured using an infrared thermometer pointed at the head, right next to the spark plug.
Readings were taken with bikes idling. First the sump temp. was observed, then the right cylinder was measured, and then the left cylinder. Readings were taken as quickly as possible.
Results from three separate bikes that were run simultaneously on the same course. This was a moderate little 20-mile run.
Bike 1: sump: 180 right cyl: 249 left cyl: 207
Bike 2: sump: 180 right cyl: 241 left cyl: 209
Bike 3: sump: 200 right cyl: 264 left cyl: 222
Bike 1 is a 1982, stock except that the exhaust was made a little more free-flowing. Unknown jetting.
Bike 2 is my 1976 "Bug Killer", pods, shotgun pipes with baffles, carefully and correctly jetted.
Bike 3 is a 1982, stock, which the owner insists on using regular gas in, and which I suspect is slightly lean. I have done a lot of side-by side riding with this rider, and his bike is always 20 degrees hotter than mine.
The following is a "before" run and then a run "after" installing the MikesXS oil filter/cooler kit. The intention of this test was to see if the kit actually had a measurable effect on engine temperatures.
Methodology: I've had the kit for about a week, but I've been waiting for the perfect riding conditions to conduct the test (not wet or rainy, air temperature at least in the 60s, and not rush hour).
The plan was to warm the bike up pretty good by riding it, measure temps; pause; then do a 28 mile round trip freeway ride maintaining 70 MPH; measure temps; pause while quickly installing the oil filter/cooler kit, then run the exact same freeway route, exactly as I had before, and measure temps.
Unfortunately my plan was somewhat thwarted. On the return leg of the "before" freeway ride, I had to slow way done for a bit of the run because there was a wreck on the interstate (once-shiny yellow pick-up resting upside-down on its cab). Traffic was backing way up in both directions. Because I was on a bike, I was able to get around everything pretty quickly and finish the run, but I had to use a different freeway for the "after" run because of the accident (I live very close to the intersection of two freeways). So, the "after" run was not as identical to the "before" run as I had hoped, but I tried my best. The results;
Warm-up run: sump: 195 right cyl: 278 left cyl: 261
Run 1, before: sump: 225 right cyl: 297 left cyl: 264
Run 2, "after": sump: 225 right cyl: 301 left cyl: 267
Okay, this was very much a less-than-perfect test, but my conclusion is that the MikesXS oil filter/cooler kit has a negligible effect on engine temperatures. (I like my kit a lot, however. It is great to finally have real filtration, it looks very good, and is a snap to install.)
