• 4 Stroke Husqvarna Motorcycles Made In Italy - About 1989 to 2014
     TE = 4st Enduro & TC = 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 The previous version was outdated and no longer supported.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!

TXC449 Oil cooler?

Is speedbrain referring to the standard dry sump located internally on the engine or did they create a new one ? I truly like the idea of having the oil cooler but if there are going to be negative trade offs then they might not be worth it for us....... Every dry sump I have ever seen until our bikes came along have the sump in the frame below and behind the stem, a great place and good 2" by 2" unrestricted reservoir for the oil to stabilize , cool and feed the engine and it draws from the sump what it likes. Our engines are only going to handle a certain amount of oil internally , everything else is going to be forced out the breathers or get locked up and blow seals. I'm sure we can successfully increasee the capacity with out loosing flow efficiencies but our bikes don't have practical room like the rally bikes. I like your ideas a-lot so don't get me wrong please , you are a pioneer and I like that . I think the skid plate reservoir would have the best overall benifits, everytime you splash threw a creek instant cool down , long desert sand washes it would have a huge surface area to cool..... Back to the speedbrain bike, the exhaust is heating the engine up alot more than ours so oil cooler helps offset some of that and that bike stays moving at good speeds most of the time to force a lot of air to the coolers. I think your on a good track for finding a solution to the long distance racers problem. Our bikes have the perfect exhaust setup for Enduro as the heat comming of it doesn't go into the bike. Also , to me that bike doesn't resemble any similarities as ours , only the name. I would prefer the heat of the oil to not go into the head of the engine but go somewhere else for trail riding applications where our fans seem to be running all the time as it is. :)
 
It's a hybrid sump, oil is stored in the back and back right of the engine case. Heat does not transfer through the cases to cool like it does on real dry sumps. Therefor the only way the oil is cooled is through the water jacket. It's like circulating water in the water jacket without radiators, there is no where for the heat to go, so the oil burns and vaporizes out the breather. The hybrid sump can hold a lot more oil than suggested as I have found in testing up to 1400cc of oil. With an oil cooler I am sure to get the capacity to 1900cc which equates to 2 quarts.

I am looking at a total weight increase with the cooler kit (adapter + exchanger) to be under 10 ounces which has been an argument for having one. Of course the oil heat exchanger will add more heat to the cooling system, that is actually the whole point, to remove heat from the oil and allow the coolant to dissipate it. The use of standard toxic coolants will probably no longer be applicable with this system, I'm not sure they are a good idea anyway with the corrosion and having to run a 1.8bar cap just to keep them from over boiling on these hot engines.
 
Just tigging some aluminum tubbing to the skid plate and circulating oil threw it would make a huge difference .
 
I did call Dudadiesel and their smallest cooler is about 1.75lbs. I should be able to make a heat exchanger which weights much less.
 
Tinken said:
Ah yes, an excellent question. In testing the 449 platform, Ty Davis of Zip-Ty racing found the oil temperatures to be between 320 to 350°F (normal temps being closer to 300°). This is caused by an unusual alloy combination in the making of the Kymco engine in that the lower cases are poor conductors of heat and tend to hold their heat in.
Click to expand...
I'm taking my heat gun this weekend and shooting the filter cover with it , I just don't believe the oil gets that hot. If it does then I need to get me one of those heat exchanger thingymajiggs. That's allmost as hot as the heads on a air cooled HD.
 
Yes, one of my first tests with the new adapter is to test oil pressure and temperature. You can't accurately test oil from outside the case. Maybe you can check at the fill point?
 
Tinken said:
Yes, one of my first tests with the new adapter is to test oil pressure and temperature. You can't accurately test oil from outside the case. Maybe you can check at the fill point?
Click to expand...
I would imagine the engine oil allways stays a few degrees hotter than the engines internals.... Even if the oil is 50 degrees hotter than the internals I would bet the oil isn't close to 350
 
Rearwheeling wrote "Our bikes have the perfect exhaust setup for Enduro as the heat comming of it doesn't go into the bike."

Your right, it goes right into my F'N new Klims!:lol:
 
I suppose you could, but I was talking about the header... Although, in the summer you could weld a stainless steel spike onto the header and cook hot dogs on it.

HotDogCooker.jpg
 
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