• 2 Stroke Husqvarna Motorcycles Made In Italy - About 1989 to 2014
     WR = 2st Enduro & CR = 2st 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 The previous version was outdated and no longer supported.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!

250-500cc WR thermostat bypass

pvduke said:
the cooler my engine runs the longer it lasts. there is less than zero chance of my engine running too cold where i ride.
Click to expand...

As a general rule, I don't think this is fair. Lots of the clearances in engines are specifically designed for a certain operating temp.

That being said, eliminating a unit that may be prone to failure (with pretty bad consequences if it does) seems like a fair play.
 
most of my rides avg 8-12,000 feet of climbing slow, steep pitches, loose or snotty stuff, 75-100* temps. i want max flow and zero restriction w/ preimum coolant. imo this type of cooling system is too small and my demands too great for a t-stat.

my bikes get pretty warm but i rarely have an o/h episode that forces me to stop. none of my bikes have had a t-stat before this and this model didnt have one previously. and in the event of an overheat episode its way easier to top it all off in one shot w/o a t-stat in the way.

if the cooling system had a much, much larger volume, the speeds were up and the loads were way, way less? then yes, i can totally see the benefit of controling the flow outweighing the restriction for a more blanced opperating temp.

a t-stat wont stop your hard-enduro bike from overheating and that's not it's intended use, quite the contrary. under slow speeds/heavy loads, once all the coolant's temp reaches the t-stat's opening threshold it'll stay open and then it's just a restriction and it wont close again until enough air past the radiators cools off the juice and causing it to shut.

ymmv!
 
Also, note that a restriction in the flow path, while reducing flow rate, also may increase the pressure of the water in the jacket, thus increasing its boiling point and making it more resistant to local vaporization.

I understand and agree with your general thoughts that a thermostat may not be needed on these types of bikes in the types of riding many (most?) of us do!
 
Kyle Tarry said:
Also, note that a restriction in the flow path, while reducing flow rate, also may increase the pressure of the water in the jacket, thus increasing its boiling point and making it more resistant to local vaporization.

I understand and agree with your general thoughts that a thermostat may not be needed on these types of bikes in the types of riding many (most?) of us do!
Click to expand...

I was going to mention something similar to that and in addition there is more complete heat exchange from block to coolant. At least that is one school of thought.
Edit:
I see rajobigguy was posting the same thing (said better) at the same time.
 
girls girls girls....dont make me pull this car over. the job is done and it freakin' rips.

ok- back to the TOPIC at hand.....(MATT, please post this in the 2T Thread Index thingy for me so others can find it maybe huh? it has other ways to do this that are just as good and a lot thriftier!)



flow check: its MASSIVE. much better. the barrel and head are nice and hot- as the jacket ports diameter provide plenty of resitriction....hoses are warm. things are NOW working a designed. will pay to check the plug once to make sure it didnt lean it out. this is at idle. in case yer blind or your monitor is crapola, it's a thumb thick jet of water and it's FA-LOWING:

005.JPG

looks professional. and it is! texture coated the shark-bite plug in the by-pass hose with my t-shirt, hey, it's better than a thumb print. paint was wet and i was in a hurry. i need to find a black hose clamp. shark-bite has the funky spring clips but, i dont trust those here. there are no clearance issues with tank etc... the hoses will rot and blow away before these fittings leak. they are light, reuseable a gajillion times, and, they are easy to get in and out of the hoses. and made is USA!

001.JPG



before:

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after:


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what would you rather have on a long crappy ride? yeh right! lol.
 
top view. dont laugh at my tank cushion. i kept losing the black one. this one's easy to find. :

003.JPG


the doctor is pleased****************************************....the patient? not so much. kinda skeered, ready to go home now....

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that's all for today. keep the ideas coming. you guys inspired me on this one. and kyle and rajo? just wait til yer father gets home!
 
pvduke,
Since the 09 didn't have a thermostat, what parts are different? (besides the obvious hoses) My 09 looks pretty neat and clean, which parts would you have to use from an 09 to accomplish what you did with the fittings?
 
pvduke said:
or- remove blockages and restrictions from the system.

the system in question was never designed for a thermostat. im trying to get that point accross. its not working and some of you just arent getting it. this thread is turning into a lesson in thermo-dynamics that doesn't even apply here.
i started this thread as an easy, cheap and professional looking way to get rid of the thermostat, which, BTW every serious hard enduro rider like knight and taddy rip right off their bikes first thing, right off the floor, and which BTW, two euro compaines make silicone hose kits for this very purpose. but what do i know.

somewhere, somehow this whole thing turned into a science guy diploma waiving pissing match.

matt- go ahead an delete this whole thread please im freakin' done with this place.
Click to expand...

Yeah guys, lets try and keep this thing on track. PVDuke had come up with a clean viable solution to his overheating problems. The problem is specific to his particular make and model and what he came up works so lets leave it at that. This might not be the right solution for everyhting and everyone but in this case it accomplished what he after so thanks for coming up with a nice alternative for those that having the same issue.:thumbsup:

I will be eliminating any posts about themodynamics as they do not belong in this thread. If you feel a need to debate the science behind Bernulies principals, prictional equivilents or velocity vs flow then start antother thread.
 
sorry- miss-typed. meant this "thread". got some personal stuff im dealing with here at home, really distracted. my bad. :( i like this thread. it covers both ends of the mod spectrum. wana see more ideas too.

dougy- from the asking around i did, if the rads are the same the 09-10 hoses should fit right up.
 
Love the AN fittings, they look awesome! Let us know how the new coolant works, I'm sure it's headache solved. :)
 
lankydoug said:
pvduke,
Since the 09 didn't have a thermostat, what parts are different? (besides the obvious hoses) My 09 looks pretty neat and clean, which parts would you have to use from an 09 to accomplish what you did with the fittings?
Click to expand...

i just rant the p#'s...the '09 and '12 pump covers are the same. so- to make the hose swap from '12 to '09'ish you need the (2) top head to radiator hoses (easy to make from bulk!) and the single two-spigot bottom hose from radiators to the pump cover (easy to make too from bulk hose and a "T").

matter of fact, it's prolly easier to do that than what i did...meh. i got no life so...what the heck! check out the parts manuals for some good shots of it all.
 
A rose bud?

This:
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Or this?
F100_F-15_engine.JPG
 
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