To Thermo-Bob or Not To - Page 10 - Kawasaki KLR 650 Forum
2008+ KLR650 Wrenching & Mod Questions For repair, maintaining or modifying discussions related to the newly updated 2008 and beyond, Generation 2 KLR650 Motorcycle.

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post #91 of 161 Old 11-28-2018, 05:00 PM
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Just a reminder; needle fluctuation or not, the stock gauge does not and cannot show you the difference between the coolant temperature entering and leaving the engine.....all it does is monitor the coolant temp at the head.

While the thermobob does lessen the temperature swings at the gauge location, the far more important thing is the lessening of the temperature difference between the coolant entering and leaving the cylinder: with a T-bob the difference is 10-15 deg......without one it's 70-100 degrees or more. The thermal stress of this difference is one of the main concerns and a primary suspect for bore distortion. The ideal condition is for the engine to be a constant temperature throughout and hot enough for the oil to work properly.

Dave
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post #92 of 161 Old 11-28-2018, 05:21 PM
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I am on board with thermo, wondering how anyone discovered the problem originally to start the studies if the stock gauge does not tell you anything. Trying to uncover signs of potential problems.

Last edited by jrdjr; 11-28-2018 at 05:26 PM.
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post #93 of 161 Old 11-28-2018, 05:44 PM
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At least one person looked at it and said "Ain't got no bypass. That ain't right. That's like the 1950s. I wonder what it's doing." The rest is history.
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post #94 of 161 Old 11-29-2018, 09:42 AM
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As I've said before, there is not and likely never will be quantifiable proof as to the extent of longevity increase or decrease in bore distortion attributed to the use of the Thermobob.....but as Voyager has said, there is enough data out there to show that it DOES provide a benefit; sprinkle a little logic and it was time to get out my credit card.

Nobody is ever going to do the testing that Damocles has laid out.....just isn't going to happen. What I can tell you is that the closest you are going to get to the proof you seek is to talk to someone that has rebuilt hundreds of KLR engines, measured the degree of bore distortion and noted which bikes had thermobobs....well, such a man exists and I've spoken to him on the subject: his name? Mike Cowlishaw aka Eaglemike and his opinion is based on observations that none of the rest of us are able to provide. Spoiler: he thinks the thermobob is a good idea. Even without all of the data provided by Bill, Mike's endorsement is enough for me.

Should you get a thermobob? I think so, but then I don't really care one way or the other.

Cheers,
Dave
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post #95 of 161 Old 11-29-2018, 10:10 AM
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Quotation From Dpelletier's post above:
Quote:
Spoiler: he thinks the thermobob is a good idea.
And . . . WHO manufactures and markets the Thermo-Bob?

I jest; AFAIK the Thermo-Bob is marketed ethically; no numeric, quantifiable claims are made for increasing reliability and durability by virtue of the device.

---------------------------------------

Discussion question # 2: After the manufacturing discontinuance of the KLR650, what will demand for Thermo-Bobs look like? (Understand they fit Versys 650s.)

Quotation rom Voyager's post above:
Quote:
I have come to the conclusion that jrdjr does not have such a background and thus is unable to understand the concepts and data behind the Thermobob. I don’t know what his background is specifically and he didn’t respond to my question asking, so I have to assume if he has an engineering degree it was a long time ago in a field such as sanitation engineering or industrial engineering where physics and thermodynamics aren’t emphasized.
Without value judgment, as I recall, jrdjr responded to your question (in his now-deleted post), disclosing his field of study was chemical engineering; that he was in a technical supervisory position, and that his duties included supervising a machine shop (whose machinists he respected). Again, FYI only, and subject to the vagaries of my flawed memory.

Last edited by Damocles; 11-29-2018 at 10:44 AM.
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post #96 of 161 Old 11-29-2018, 11:40 AM
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Quote:
Originally Posted by Damocles View Post
Quotation From Dpelletier's post above:


And . . . WHO manufactures and markets the Thermo-Bob?

I jest; AFAIK the Thermo-Bob is marketed ethically; no numeric, quantifiable claims are made for increasing reliability and durability by virtue of the device.
...I figured that might come up.....in jest or not. Remember also that Mike sells the 685 kit and would likely sell more of them if nobody installed a thermobob! ;-)

Regardless, Mike isn't getting rich off either product.....luckily he doesn't have to rely on them. IMO both Mike and Bill have proven to be a boon to the KLR community many times over.


Cheers,
Dave
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post #97 of 161 Old 11-29-2018, 11:56 AM
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A lot of talk about engineering degrees being thrown about ..

No talk of a degree in English or public relations though ... Just sayin' ...

I have no degree ... But I am samrt ... And I have a Thermobob ... It works as advertised. Will my engine last longer ? Dunno but it makes me feel GREAT !!!
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post #98 of 161 Old 11-29-2018, 12:07 PM
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The market for the Thermo-Bobs are growing with the expanding of the 'Snow-Bike' track & ski kits.

The (Kawasaki) motocross bikes which are used for the Snow-bike conversions come from the factories with NO THERMOSTATS or even provisions for one. I suspect the the other MX manufactures cooling systems are also devoid of a thermostat.
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Last edited by pdwestman; 11-29-2018 at 12:10 PM.
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post #99 of 161 Old 11-29-2018, 04:14 PM
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Geez, when did everyone get so darn cranky ?? Must be the winter ... I have to think that if everyone was out riding everyone would be less on edge. When I logged in this morning I was reading klrforum.com and now I feel like I'm in a quilting forum ...

Oh well, in the spirit of this thread Ill take the high road and not say anything controversial ..

Now pardon me while I head out to the garage to put automotive oil in my bike, tweak my thermobob, and get my GEN1 (way better than those GEN2 bikes) ready for next season.

Oh and I oil my chain with WD-40 ... Best stuff going.
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post #100 of 161 Old 11-29-2018, 07:14 PM
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Quote:
Originally Posted by pdwestman View Post
Ok, so this is the 101st posting since the resurrection of this thread, maybe it ought to be LOCKED from further input?
@pdwestman, @Voyager, @jrdjr,

I don't like locking threads because someone, in another year or so ;^), may want to revisit the topic. While they should start a new thread some people are more comfortable tagging onto an older one.

This thread is going to get cleaned up a bit. I will go remove some of the off-topic stuff. I'm not a big fan of censorship (that's what a week's trip to Banned Camp is for. Really a last resort. Prefer to let people say their pieces.) as things usually get sorted out on their own. Some of the back and forth, though, doesn't really serve any future purpose so I'll gently archive it.
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