• 4 Stroke Husqvarna Motorcycles Made In Austria - About 2014 & Newer
     FE = 4st Enduro & FC = 4st Cross

  • Hi everyone,

    As you all know, Coffee (Dean) passed away a couple of years ago. I am Dean's ex-wife's husband and happen to have spent my career in tech. Over the years, I occasionally helped Dean with various tech issues.

    When he passed, I worked with his kids to gather the necessary credentials to keep this site running. Since then (and for however long they worked with Coffee), Woodschick and Dirtdame have been maintaining the site and covering the costs. Without their hard work and financial support, CafeHusky would have been lost.

    Over the past couple of weeks, I’ve been working to migrate the site to a free cloud compute instance so that Woodschick and Dirtdame no longer have to fund it. At the same time, I’ve updated the site to a current version of XenForo (the discussion software it runs on). The previous version was outdated and no longer supported.

    Unfortunately, the new software version doesn’t support importing the old site’s styles, so for now, you’ll see the XenForo default style. This may change over time.

    Coffee didn’t document the work he did on the site, so I’ve been digging through the old setup to understand how everything was running. There may still be things I’ve missed. One known issue is that email functionality is not yet working on the new site, but I hope to resolve this over time.

    Thanks for your patience and support!

FE/FC My new FE 350!

The price initialy set me back when I bought the XF2 coolant. Now I won't use anything else. Overheating is a thing of the past and the stuff won't freeze. It doesn't corrode anything in the motor and the lower pressures are easier on seals and hoses. The half gallon container will typically do two bikes also.
 
Removing the thermostat doesn't always results in better cooling. Too fast a flow and the liquid doesn't have time to absorb the heat and works counter productive.
We tried this on a race engine with and electrical water pump. it has the benefit that it doesn't run when not needed and the speed can be accurately tuned for the required temperature.
With engine at max output and the pump at full bore it actually cooled the engine less then backing the pump off to 3/4 speed. Logic would disagree with this but the real life results where there.
Also very bad to run a aluminium engine too cold as the best way is uniform temperature spread around the complete cylinder and head assembly. Thermostat helps with that.
I do agree that most thermostats now are a bit on the excessive high temperature end, this die to emissions and so on. Changing it to a lower temp unit might be better than removing it and also lowering the temp the fan comes on.
 
Typical motorsports coolant systems are about 1 quart. The coolant need only sit at the top of the core elements or 4mm above. The space is needed for thermal expansion.

bikesparky said:
Too fast a flow and the liquid doesn't have time to absorb the heat and works counter productive.
Click to expand...

This is actually not true, but is a common misconception. I can and had to prove this through mathematical calculation to the current administration here at ZipTy for the exact same argument before they would move forward to creating XF2. My thermal heat calculations are all based upon the change in temperature (^T) and the rate of coolant (meters/second) W/m-2K/s (watts per meter squared kelvin per second). This is why XF2 out performs coolants which are higher viscosity such as Engine ice See graph below. A experiment would be to place an air obstruction in front of the radiators in order to slow the air down and allow it to have longer contact. Commercial drivers do this to increase the temperatures during winter months.

xf_vs_xf2.jpg


I suspect the reason behind the heat change in some instances is because of cavitation. This is a huge problem when cooling at high rates speed. XF2 has very little cavitation due to its very little water content.

Thermostats are used based upon water which has a higher specific heat. It takes longer to heat water up. XF2 is different in that it heats very rapidly and it can release that heat energy very fast. So even an aluminum engine with XF2 will heat very rapidly and maintain a constant temperature for light or heavy loads.
 
XF2 is what I run I love the stuff!!!

Well checked the valves again today, a little early for the 2nd check but it's at 28 hours and 581 miles.. And once agai. Valves where perfect . And I have to say are pretty easy to check, maybe not as easy as some of the Japanese bikes... But a have worked on and adjusted worse
 
Tinken said:
I suspect the reason behind the heat change in some instances is because of cavitation. This is a huge problem when cooling at high rates speed. XF2 has very little cavitation due to its very little water content.

Thermostats are used based upon water which has a higher specific heat. It takes longer to heat water up. XF2 is different in that it heats very rapidly and it can release that heat energy very fast. So even an aluminum engine with XF2 will heat very rapidly and maintain a constant temperature for light or heavy loads.
Click to expand...

It does make sense however if XF2 is able to absorb heat quicker there can be faster flow, more heat release in the radiators and better cooling.
 
Picking up my FE 350 on the 17th of March. Lots of good info in this thread. Going to get the dealer to load the euro map. Have any of you guys had this done? What are the benefits?
Thanks
 
Had halls do it to my 501. Bike runs smoother and cooler. Don't hesitate to have it done. I also run the trailtech switch to cycle between 3 maps. Once the ecu is unlocked and the euro map is installed it allows you to change maps on the fly.
 
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