Boyesen supercooler work?

Rider 5280 wrote:

I have the Boyesen Supercooler on a 2008 Honda CRF450R running Engine Ice. In my personal experience, Engine ice did seem to cool things down a...

I have the Boyesen Supercooler on a 2008 Honda CRF450R running Engine Ice. In my personal experience, Engine ice did seem to cool things down a bit over OEM coolant. With a Supercooler and Engine Ice, the bike seems to run about the same temp as my 2007 Honda CRF450R with a stock water pump running Evans coolant.

Additionally, when I compare the "typical engine temps" above to other bikes that have OEM water pumps and OEM coolant (2016 YZ250F, 2020 YZ450F), they all seem to run similarly warm.

Note that I have *NOT* done an actual experiment to compare engine temps side-by-side. My observations above are *ONLY* based on the following setups I have on all my bikes:

(1) Tusk temperature-indicating radiator cap
https://www.rockymountainatvmc.com/parts/tusk-high-pressure-radiator-ca…

(2) Factory Effex temp-indicator strips on the radiators and the sides of the engine cylinders
https://www.rockymountainatvmc.com/parts/factory-effex-temperature-stic…

I wouldn't say either of these products are highly accurate, but rather indicate trends. And I use them in that manner.

Given my *PERSONAL* experience with the Boyesen Supercooler, I am no longer convinced it's a "must have." If looking for cooler temps, I'd start with Engine Ice based on what I've seen. If you're a pro pushing the bike for a solid 30 minutes in a sand moto, however, I'd get a Supercooler.

This MXA review aligns with my personal experience with Boyesen's Supercooler:
https://motocrossactionmag.com/mxa-team-tested-boyesen-supercooler-wate…

The biggest heat generator for me is how much I slip the clutch. Rekluse clutches dropped operating temps for me given that they are better than me at constant metering of the clutch. That was my biggest source of heat. Slower speeds/lack of airflow is a close 2nd.

Hope this was valuable!

P.S. I am impressed by Evens coolant, but my current thinking is that I'd prefer to stick with more conventional coolants for ease of topping off and replacement + I'd prefer boil-over symptoms at this point versus extreme heat engine damage (e.g. seals) potential since Evans can withstand the heat of the sun ... which I never want the engine to experience. My tune has changed on this over the years, FWIW. I ran Evans from ~ 2008-2021. I ran it because I rode Baja desert conditions in the middle of summer in AZ and CA. I never had issues with Evans whatsoever, but I am simply not riding those extremes anymore. In this application I was using it as a "life line" to make sure I could make it back to the truck in case I was having overheating issues. Again, I always had good luck with Evans, just a recent change in type of riding where the extra boil-over protection is not necessary.