05-19-2016, 03:50 PM | #16 | |
Join Date: Jan 2015
Location: England
Posts: 382
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Quote:
regarding fitting a bypass , I was thinking a similar thing and perhaps having an inline tap in the bypass tube to gain some control of the flow. There could be a problem though, the ECU relies heavily on the temp sensor in the thermostat housing. by introducing a small bypass it could upset the balance between actual engine temp and recorded temp from the sensor in the housing. this is just guess work on my part I'm still tempted to have a play with this though |
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05-19-2016, 05:17 PM | #17 |
Join Date: Feb 2016
Location: Portsmouth, Virginia, USA
Posts: 632
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Well, I was thinking that if the bypass were close to the thermostat (and sensors) it would be a moot point or maybe actually get the true engine temp to the sensor sooner. As it is, the temp sensor works off the coolant that is trapped in the thermostat housing. Except for the small bleed hole on the thermostat, the housing is a dead end for coolant flow until the thermostat opens. The temp sensor actually lags behind the actual temp during warm-up. If I had that housing I'd want to see if I could drill and tap for a bypass spigot. At the same time I'd like to see if a different thermostat would fit (what Spud mentioned).
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05-19-2016, 05:49 PM | #18 | |
Join Date: Jan 2015
Location: England
Posts: 382
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Quote:
Think I might have to purchase a spare thermostat housing to play with |
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05-19-2016, 09:12 PM | #19 |
Join Date: Sep 2014
Location: Arvada, CO
Posts: 1,004
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I'm very interested in this mod but have almost nothing to add to this thread except a link to the Thermo-bob page:
http://shop.watt-man.com/Thermo-Bobs_c4.htm FAQ - http://www.watt-man.com/Information__Articles.html
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Red 5 standing by! 2015 CSC red RX3 with 19" front wheel, Shinko 804/805, skid plate, tall seat, 13T/45T sprockets, progressive shock, Winyoochanok windshield, GENSSI LED headlight, SW-Motech tankbag, Shorai Lithium battery 2014 Ural Patrol |
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05-19-2016, 09:26 PM | #20 |
Join Date: Sep 2015
Location: East Central Hellinois
Posts: 1,344
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Good thread and very interesting mod. If the ECU is receiving more accurate information might that better affect the mixtures and partially clear up the OCS issue? ? ?
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05-20-2016, 12:21 AM | #21 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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After doing a bit of research, I see the stock thermostat in the KLR650 is removed during the installation of the Thermo-Bob. The Thermo-Bob bypass includes an automotive thermostat set for a higher temperature. The Thermo-Bob allows coolant to circulate bypassing the radiators before its thermostat opens. The early flow of coolant in the Thermo-Bob bypass is designed to allow the engine to reach ideal operating temperature more quickly, and to prevent the coolant from forming hot spots in the cylinder.
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Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 Last edited by SpudRider; 05-20-2016 at 10:40 AM. |
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05-20-2016, 01:32 AM | #22 |
Join Date: Sep 2014
Location: Arvada, CO
Posts: 1,004
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They make a 3rd gen Thermo-bob for the Ninja 250 that might work for the RX3. It looks like it connects inline instead of bolting on, but I could be misunderstanding the diagrams.
http://shop.watt-man.com/Thermo-Bob-...-YEARS-TBN.htm Spud, I think that's how it works. When the engine is cold, the bypass allows warm coolant to warm the engine faster. The second thermostat in the Thermo-bob closes the bypass at 195 degrees, so the radiators can do their job. This keeps the engine at a steady 185-195 degrees F, so water and fuel can vaporize and exit the crankcase.
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Red 5 standing by! 2015 CSC red RX3 with 19" front wheel, Shinko 804/805, skid plate, tall seat, 13T/45T sprockets, progressive shock, Winyoochanok windshield, GENSSI LED headlight, SW-Motech tankbag, Shorai Lithium battery 2014 Ural Patrol |
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05-20-2016, 11:02 AM | #23 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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As usual, thanks for posting the great information, amigo.
I found the following webpage which describes the operation and design of the Thermo-Bob. This webpage duplicates your information, but adds the missing piece of information I was seeking. http://www.watt-man.com/uploads/TB_Testing.pdf The bypass line does not contain a thermostat. The original thermostat is removed, and an automotive thermostat, with a higher opening temperature, is contained within the Thermo-Bob. The bypass line is located upstream of the thermostat in the Thermo-Bob. This bypass line is always open, since it does not contain a thermostat. However, the bypass line is much smaller in diameter than the main radiator line. Therefore, the bypass line is more restrictive, and is mostly bypassed after the thermostat in the Thermo-Bob itself opens.
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Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 |
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05-20-2016, 11:06 AM | #24 |
Join Date: Jan 2015
Location: England
Posts: 382
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Thanks detours, excellent info
I will definitely be taking a closer look at the thermobob. I wonder if the hose size connections are the same as the RX3. I think we would have to remove the thermostat from our RX3 thermostat housing and then connect it somewhere between the cylinder head and the thermobob. By doing this our temp sensors will then be before the thermostat, where they need to be |
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05-20-2016, 11:08 AM | #25 | ||
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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Quote:
Quote:
1. The stock thermostat housing needs to be able to accommodate a fitting for the bypass hose. 2. The short hose with the tight bend, which connects the radiator to the inlet of the water pump, also needs to be able to accommodate a fitting for the bypass hose. Ideally, we should also find a thermostat with a higher operating temperature (195 degree Fahrenheit), which fits inside the stock thermostat housing. However, the bypass itself would still be an improvement, even with the stock thermostat.
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Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 |
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05-20-2016, 11:15 AM | #26 |
Join Date: Jan 2015
Location: England
Posts: 382
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I have been having a look at a home made bypass solution based on peters excellent idea.
By removing one of our temp sensors from the thermostat housing it maybe possible to screw in a bypass connection in its place. Then refit the temp sensor in the boss of a connector. One problem is that the parts to make this might not be a lot cheaper than just buying the thermobob. |
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05-20-2016, 11:19 AM | #27 | |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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Quote:
We could remove the stock thermostat, and relocate the stock thermostat housing closer to the outlet from the cylinder head. Then we could place the Thermo-Bob downstream from the stock thermostat housing, somewhere near the original location of the stock thermostat housing. Of course, we do need to contact Watt-man, and see if any of his different Thermo-Bob kits will fit the hoses of the RX3.
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Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 |
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05-20-2016, 11:27 AM | #28 | |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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Quote:
Even if we relocate the stock thermostat housing, and install a Thermo-Bob downstream from it, I think we would still need to fit some type of adapter to accommodate the short hose with the tight bend which connects the right radiator to the water pump housing.
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Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 |
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05-20-2016, 11:48 AM | #29 | |
Join Date: Jan 2015
Location: England
Posts: 382
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Quote:
Its going to take a bit of faffing, possibly with adapters, to get all to fit nicely |
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05-20-2016, 12:02 PM | #30 |
Join Date: Jan 2015
Location: England
Posts: 382
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Here's a link to a pdf giving, amongst other things, the hose size for the thermobob 3.
http://www.watt-man.com/uploads/What...ent_Thermo.pdf It says that there is a 5/8 inch and 3/4 inch available. 1/ what's this " old money "stuff, where's the metric 2/ I've no idea what the internal diameter of our hoses are |
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