I cannot answer your question from any standpoint of expertise. All I can tell you, on my LX2610 (different engine), when my tractor gets to 4 bars and I pull off that 1st side cover, the air now coming out is HOT. I will have to test actual block temp with my IR Temp sensor next time I use them.
Bird Dogger - One thing I started doing when only running the front cover and engine temp got to 3 bars, I'd fold back the cover on the left side to allow some air to be pulled through the front side hood vent, through the radiator. An update could be a flap over that vent that could be velcroed closed when cold and opened once up to temp. This is what I did when air temps were in the teens or less and engine was up to temp.
I took my snowblower off yesterday to use the tractor/grapple while picking up deadfall and gathered up branches in the woods. With a record daily high temp yesterday of 57°F, I forgot to remove the 3 piece set of covers when I parked the snowblower. It didn’t take long for the temp gauge to reach 3 bars displayed when I remembered the covers in place. Watching the temp gauge, it never displayed more than 4 bars. I shot some temps with the IR heat gun and the oil sump pan registered 210°F, the oil filter was at 205°F, and points on the engine block itself registered 200-225°F depending on the location. The loading wasn’t as much as running the snowblower but still wasn’t at idle either. And the outdoor temp was +57°F. The fan had to be drawing at least some outside air in from below or where ever to not let the engine temps rise above 4 bars. With engine and oil temps just over 200° it certainly doesn’t appear to be running “hot” while in that 4 bar displayed range.
Today I removed the 3 covers and continued cleaning up deadfall in the woods with the tractor and grapple. Another daily record high here for March with a temperature of +63°F. Doing the same work with generally the same operating procedures, the temperature gauge on the B2650 ranged between 2 and 3 bars displayed. With the same IR heat gun after hours of running, (same as yesterday), the oil pan registered 150°F, the oil filter was at 145°F, and the engine block averaged 170° +/- a few degrees depending on location. Certainly not hot by any means and maybe on the cool side of standard operating temps, especially for winter….up here anyway?
Fatfenders, when you get a chance, it would be nice to know some actual temps (IR heatgun) when your LX is in that 4 bar displayed range. It might not be as hot as it seems. But with the new LX models, who knows? Both OTT member “Eagle” and I reported pretty much the same results on our B2650s last winter without each other knowing at the same time. I reported also that the temperature response was very linear in that it took steadily increasing and sustained load to get the next higher reading on the gauge. I’ve never seen my over temp light come on. It’ll be interesting to see if the new LX models respond in the same manner.
Depending on how the LX models react, if it’s somewhat similar to the B2650 it might not be necessary to modify that front grill cover. Some experimenting while shooting some temps with an IR heat gun would be the real test to know where the actual temps are at. If we really didn’t need to do that mod it would be nice to just keep it simple and keep the price as low as it is compared to just factory front piece cover. To do it up right, by the time an opening was marked out, cut, reinforced, and zippers/Velcro sewn in place it all adds up to substantial time. But it can be done! Especially if necessary.
Or it could become an additional option til more experience is gained?