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nakedwaterskier
Posts: 650
Joined: Wed Apr 28, 2004 9:32 am

thermo bob vs drilling hole in thermostat

Post by nakedwaterskier » Thu Feb 04, 2016 1:41 pm

Wouldn't just drilling a 1/8 or 3/32 hole in the thermostat accomplish most of what the thermo bob is supposed to accomplish?
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Jim Ralf
Posts: 4
Joined: Wed Nov 05, 2014 1:19 am

thermo bob vs drilling hole in thermostat

Post by Jim Ralf » Fri Feb 05, 2016 3:46 am

I have had that same thought. Years ago I had a 70' Saab with a V4 that had a drilled thermostat and a 98' BMW Kbike that had one. On Thursday, February 4, 2016 8:41 PM, "nakedwaterskier@... [DSN_KLR650]" DSN_KLR650@yahoogroups.com> wrote:   Wouldn't just drilling a 1/8 or 3/32 hole in the thermostat accomplish most of what the thermo bob is supposed to accomplish? #ygrps-yiv-323238914 #ygrps-yiv-323238914yiv3290858287 #ygrps-yiv-323238914yiv3290858287 -- #ygrps-yiv-323238914yiv3290858287ygrp-mkp { border:1px solid #d8d8d8;font-family:Arial;margin:10px 0;padding:0 10px;} #ygrps-yiv-323238914 #ygrps-yiv-323238914yiv3290858287 #ygrps-yiv-323238914yiv3290858287ygrp-mkp hr { border:1px solid #d8d8d8;} #ygrps-yiv-323238914 #ygrps-yiv-323238914yiv3290858287 #ygrps-yiv-323238914yiv3290858287ygrp-mkp #ygrps-yiv-323238914yiv3290858287hd { color:#628c2a;font-size:85%;font-weight:700;line-height:122%;margin:10px 0;} #ygrps-yiv-323238914 #ygrps-yiv-323238914yiv3290858287 #ygrps-yiv-323238914yiv3290858287ygrp-mkp #ygrps-yiv-323238914yiv3290858287ads { margin-bottom:10px;} #ygrps-yiv-323238914 #ygrps-yiv-323238914yiv3290858287 #ygrps-yiv-323238914yiv3290858287ygrp-mkp 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jeffsaline
Posts: 54
Joined: Tue Jan 16, 2007 9:37 am

thermo bob vs drilling hole in thermostat

Post by jeffsaline » Fri Feb 05, 2016 8:53 am

#ygrps-yiv-444781818 .ygrps-yiv-444781818ygrp-photo-title { OVERFLOW:hidden;FONT-SIZE:smaller;HEIGHT:15px;WIDTH:75px;TEXT-ALIGN:center;CLEAR:both;} #ygrps-yiv-444781818 DIV.ygrps-yiv-444781818ygrp-photo { BORDER-TOP:black 1px solid;HEIGHT:62px;BORDER-RIGHT:black 1px solid;WIDTH:62px;BACKGROUND-REPEAT:no-repeat;BORDER-BOTTOM:black 1px solid;BACKGROUND-POSITION:center 50%;BORDER-LEFT:black 1px solid;BACKGROUND-COLOR:white;} #ygrps-yiv-444781818 DIV.ygrps-yiv-444781818photo-title A { TEXT-DECORATION:none;} #ygrps-yiv-444781818 DIV.ygrps-yiv-444781818photo-title A:active { TEXT-DECORATION:none;} #ygrps-yiv-444781818 DIV.ygrps-yiv-444781818photo-title A:hover { TEXT-DECORATION:none;} #ygrps-yiv-444781818 DIV.ygrps-yiv-444781818photo-title A:visited { TEXT-DECORATION:none;} #ygrps-yiv-444781818 DIV.ygrps-yiv-444781818attach-table DIV.ygrps-yiv-444781818attach-row { CLEAR:both;} #ygrps-yiv-444781818 DIV.ygrps-yiv-444781818attach-table DIV.ygrps-yiv-444781818attach-row DIV { FLOAT:left;} #ygrps-yiv-444781818 P { OVERFLOW:hidden;PADDING-BOTTOM:3px;PADDING-TOP:15px;PADDING-LEFT:0px;CLEAR:both;PADDING-RIGHT:0px;} #ygrps-yiv-444781818 DIV.ygrps-yiv-444781818ygrp-file { WIDTH:30px;} #ygrps-yiv-444781818 DIV.ygrps-yiv-444781818attach-table DIV.ygrps-yiv-444781818attach-row DIV DIV A { TEXT-DECORATION:none;} #ygrps-yiv-444781818 DIV.ygrps-yiv-444781818attach-table DIV.ygrps-yiv-444781818attach-row DIV DIV SPAN { FONT-WEIGHT:normal;} #ygrps-yiv-444781818 DIV.ygrps-yiv-444781818ygrp-file-title { FONT-WEIGHT:bold;} On Fri, 5 Feb 2016 09:43:09 +0000 (UTC) "Jim Ralf jimralf@... [DSN_KLR650]" DSN_KLR650@yahoogroups.com> writes:   I have had that same thought. Years ago I had a 70' Saab with a V4 that had a drilled thermostat and a 98' BMW Kbike that had one.   On Thursday, February 4, 2016 8:41 PM, "nakedwaterskier@... [DSN_KLR650]" DSN_KLR650@yahoogroups.com> wrote:   Wouldn't just drilling a 1/8 or 3/32 hole in the thermostat accomplish most of what the thermo bob is supposed to accomplish? <><><><><><><> <><><><><><><>   Jim, nakedwaterskier,   Enlarging the hole in the stock stat would not even be close to doing what a T-Bob does.   The larger hole would allow more coolant to pass which would take longer to get the coolant (and engine) to operating temperature.  It would put more coolant directly to the radiator which would cool it and then send it back to the engine.  The effect would be exactly opposite of what most owners would like.   The T-Bob always flows a bit of coolant from the engine directly back into the engine so coolant temperature changes are less drastic.  That is the by-pass part.  When the stat does open the coolant that goes to the radiator and returns to the engine mixes with the coolant from the by-pass and again reduces dramatic temperature changes.   That is a short, simple description.  There is more to a T-Bob than meets the eye.   Best, Jeff Saline The Beautiful Black Hills of South Dakota 75 R90/6, 03 KLR650 . . . . . . .   ____________________________________________________________ [b]Protect what matters[/b] Knowing your flood risk and being prepared can help keep your family safe ... https://ad.doubleclick.net/ddm/clk/296043991;123049086;l
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nakedwaterskier
Posts: 650
Joined: Wed Apr 28, 2004 9:32 am

thermo bob vs drilling hole in thermostat

Post by nakedwaterskier » Fri Feb 05, 2016 10:10 am

a little flow or a little more flow...i haven't had to look at the stock thermostat ever...would  take a hair longer to warm up but keep the rush of cold water hitting a hot block
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nakedwaterskier
Posts: 650
Joined: Wed Apr 28, 2004 9:32 am

thermo bob vs drilling hole in thermostat

Post by nakedwaterskier » Fri Feb 05, 2016 10:14 am

a little flow or a little more flow...i haven't had to look at the stock thermostat ever...would  take a hair longer to warm up but keep the rush of cold water FROM hitting a hot block on warmup...if you figured out the right size hole...many cars do this with a whole and or little 1 way valve in the thermostat
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nakedwaterskier
Posts: 650
Joined: Wed Apr 28, 2004 9:32 am

thermo bob vs drilling hole in thermostat

Post by nakedwaterskier » Fri Feb 05, 2016 10:26 am

There is no rush of cold water into a hot block if you allow a little coolant solution to continuously flow?
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jeffsaline
Posts: 54
Joined: Tue Jan 16, 2007 9:37 am

thermo bob vs drilling hole in thermostat

Post by jeffsaline » Fri Feb 05, 2016 11:28 am

#ygrps-yiv-1310864994 .ygrps-yiv-1310864994ygrp-photo-title { OVERFLOW:hidden;FONT-SIZE:smaller;HEIGHT:15px;WIDTH:75px;TEXT-ALIGN:center;CLEAR:both;} #ygrps-yiv-1310864994 DIV.ygrps-yiv-1310864994ygrp-photo { BORDER-TOP:black 1px solid;HEIGHT:62px;BORDER-RIGHT:black 1px solid;WIDTH:62px;BACKGROUND-REPEAT:no-repeat;BORDER-BOTTOM:black 1px solid;BACKGROUND-POSITION:center 50%;BORDER-LEFT:black 1px solid;BACKGROUND-COLOR:white;} #ygrps-yiv-1310864994 DIV.ygrps-yiv-1310864994photo-title A { TEXT-DECORATION:none;} #ygrps-yiv-1310864994 DIV.ygrps-yiv-1310864994photo-title A:active { TEXT-DECORATION:none;} #ygrps-yiv-1310864994 DIV.ygrps-yiv-1310864994photo-title A:hover { TEXT-DECORATION:none;} #ygrps-yiv-1310864994 DIV.ygrps-yiv-1310864994photo-title A:visited { TEXT-DECORATION:none;} #ygrps-yiv-1310864994 DIV.ygrps-yiv-1310864994attach-table DIV.ygrps-yiv-1310864994attach-row { CLEAR:both;} #ygrps-yiv-1310864994 DIV.ygrps-yiv-1310864994attach-table DIV.ygrps-yiv-1310864994attach-row DIV { FLOAT:left;} #ygrps-yiv-1310864994 P { OVERFLOW:hidden;PADDING-BOTTOM:3px;PADDING-TOP:15px;PADDING-LEFT:0px;CLEAR:both;PADDING-RIGHT:0px;} #ygrps-yiv-1310864994 DIV.ygrps-yiv-1310864994ygrp-file { WIDTH:30px;} #ygrps-yiv-1310864994 DIV.ygrps-yiv-1310864994attach-table DIV.ygrps-yiv-1310864994attach-row DIV DIV A { TEXT-DECORATION:none;} #ygrps-yiv-1310864994 DIV.ygrps-yiv-1310864994attach-table DIV.ygrps-yiv-1310864994attach-row DIV DIV SPAN { FONT-WEIGHT:normal;} #ygrps-yiv-1310864994 DIV.ygrps-yiv-1310864994ygrp-file-title { FONT-WEIGHT:bold;} #ygrps-yiv-1310864994 #ygrps-yiv-1310864994ygrp-mkp { BORDER-TOP:#d8d8d8 1px solid;FONT-FAMILY:Arial;BORDER-RIGHT:#d8d8d8 1px solid;BORDER-BOTTOM:#d8d8d8 1px solid;PADDING-BOTTOM:0px;PADDING-TOP:0px;PADDING-LEFT:10px;MARGIN:10px 0px;BORDER-LEFT:#d8d8d8 1px solid;PADDING-RIGHT:10px;} #ygrps-yiv-1310864994 #ygrps-yiv-1310864994ygrp-mkp HR { BORDER-TOP:#d8d8d8 1px solid;BORDER-RIGHT:#d8d8d8 1px solid;BORDER-BOTTOM:#d8d8d8 1px solid;BORDER-LEFT:#d8d8d8 1px solid;} #ygrps-yiv-1310864994 #ygrps-yiv-1310864994ygrp-mkp #ygrps-yiv-1310864994hd { FONT-SIZE:85%;FONT-WEIGHT:700;COLOR:#628c2a;MARGIN:10px 0px;LINE-HEIGHT:122%;} #ygrps-yiv-1310864994 #ygrps-yiv-1310864994ygrp-mkp #ygrps-yiv-1310864994ads { MARGIN-BOTTOM:10px;} #ygrps-yiv-1310864994 #ygrps-yiv-1310864994ygrp-mkp .ygrps-yiv-1310864994ad { PADDING-BOTTOM:0px;PADDING-TOP:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;} #ygrps-yiv-1310864994 #ygrps-yiv-1310864994ygrp-mkp .ygrps-yiv-1310864994ad P { MARGIN:0px;} #ygrps-yiv-1310864994 #ygrps-yiv-1310864994ygrp-mkp .ygrps-yiv-1310864994ad A { TEXT-DECORATION:none;COLOR:#0000ff;} On 05 Feb 2016 08:26:49 -0800 "nakedwaterskier@... [DSN_KLR650]" DSN_KLR650@yahoogroups.com> writes: There is no rush of cold water into a hot block if you allow a little coolant solution to continuously flow?   <><><><><><><><> <><><><><><><><>   Not sure if you are asking a question or making a statement.   There is a rush of cooler coolant into the engine everytime the stat opens.  I'm just going from memory here but I kind of recall with the stock system the difference is about 80 degrees and with the T-Bob it is about 15 degrees.   Another huge difference between the stock stat and the stat in the T-Bob is about 30 degrees.  Stock stat is 162 if I recall correctly and the T-Bob stat is 195 last time I checked.   In hot conditions with the stat open all the time there is pretty much no difference in the cooling affect between stock and T-Bob systems.  The limiting factor when the stat is open all the time is the ability of the radiator to shed heat.   My opinion is the T-Bob is not needed on a bike that is never ridden in ambient temperatures below 70 degrees.  The key word there is never.   Best, Jeff Saline The Beautiful Black Hills of South Dakota 75 R90/6, 03 KLR650     . . . . . . .   ____________________________________________________________ [b]Citi ThankYou Preferred[/b] Earn 20,000 bonus ThankYou Points https://ad.atdmt.com/c/go;p=11042209007773;a=11042209015555;ev.a=1;idfa=;idfa_lat=;aaid=;aaid_lat=;cache=
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nakedwaterskier
Posts: 650
Joined: Wed Apr 28, 2004 9:32 am

thermo bob vs drilling hole in thermostat

Post by nakedwaterskier » Fri Feb 05, 2016 11:35 am

The temperature differential between the hot block and the cold coolant solution would be reduced with the proper sized hole in the thermostat; especially in SoCal where I live...and where a Thermo Bob has much less utility.
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jeffsaline
Posts: 54
Joined: Tue Jan 16, 2007 9:37 am

thermo bob vs drilling hole in thermostat

Post by jeffsaline » Fri Feb 05, 2016 11:52 am

#ygrps-yiv-995521734 .ygrps-yiv-995521734ygrp-photo-title { OVERFLOW:hidden;FONT-SIZE:smaller;HEIGHT:15px;WIDTH:75px;TEXT-ALIGN:center;CLEAR:both;} #ygrps-yiv-995521734 DIV.ygrps-yiv-995521734ygrp-photo { BORDER-TOP:black 1px solid;HEIGHT:62px;BORDER-RIGHT:black 1px solid;WIDTH:62px;BACKGROUND-REPEAT:no-repeat;BORDER-BOTTOM:black 1px solid;BACKGROUND-POSITION:center 50%;BORDER-LEFT:black 1px solid;BACKGROUND-COLOR:white;} #ygrps-yiv-995521734 DIV.ygrps-yiv-995521734photo-title A { TEXT-DECORATION:none;} #ygrps-yiv-995521734 DIV.ygrps-yiv-995521734photo-title A:active { TEXT-DECORATION:none;} #ygrps-yiv-995521734 DIV.ygrps-yiv-995521734photo-title A:hover { TEXT-DECORATION:none;} #ygrps-yiv-995521734 DIV.ygrps-yiv-995521734photo-title A:visited { TEXT-DECORATION:none;} #ygrps-yiv-995521734 DIV.ygrps-yiv-995521734attach-table DIV.ygrps-yiv-995521734attach-row { CLEAR:both;} #ygrps-yiv-995521734 DIV.ygrps-yiv-995521734attach-table DIV.ygrps-yiv-995521734attach-row DIV { FLOAT:left;} #ygrps-yiv-995521734 P { OVERFLOW:hidden;PADDING-BOTTOM:3px;PADDING-TOP:15px;PADDING-LEFT:0px;CLEAR:both;PADDING-RIGHT:0px;} #ygrps-yiv-995521734 DIV.ygrps-yiv-995521734ygrp-file { WIDTH:30px;} #ygrps-yiv-995521734 DIV.ygrps-yiv-995521734attach-table DIV.ygrps-yiv-995521734attach-row DIV DIV A { TEXT-DECORATION:none;} #ygrps-yiv-995521734 DIV.ygrps-yiv-995521734attach-table DIV.ygrps-yiv-995521734attach-row DIV DIV SPAN { FONT-WEIGHT:normal;} #ygrps-yiv-995521734 DIV.ygrps-yiv-995521734ygrp-file-title { FONT-WEIGHT:bold;} #ygrps-yiv-995521734 #ygrps-yiv-995521734ygrp-mkp { BORDER-TOP:#d8d8d8 1px solid;FONT-FAMILY:Arial;BORDER-RIGHT:#d8d8d8 1px solid;BORDER-BOTTOM:#d8d8d8 1px solid;PADDING-BOTTOM:0px;PADDING-TOP:0px;PADDING-LEFT:10px;MARGIN:10px 0px;BORDER-LEFT:#d8d8d8 1px solid;PADDING-RIGHT:10px;} #ygrps-yiv-995521734 #ygrps-yiv-995521734ygrp-mkp HR { BORDER-TOP:#d8d8d8 1px solid;BORDER-RIGHT:#d8d8d8 1px solid;BORDER-BOTTOM:#d8d8d8 1px solid;BORDER-LEFT:#d8d8d8 1px solid;} #ygrps-yiv-995521734 #ygrps-yiv-995521734ygrp-mkp #ygrps-yiv-995521734hd { FONT-SIZE:85%;FONT-WEIGHT:700;COLOR:#628c2a;MARGIN:10px 0px;LINE-HEIGHT:122%;} #ygrps-yiv-995521734 #ygrps-yiv-995521734ygrp-mkp #ygrps-yiv-995521734ads { MARGIN-BOTTOM:10px;} #ygrps-yiv-995521734 #ygrps-yiv-995521734ygrp-mkp .ygrps-yiv-995521734ad { PADDING-BOTTOM:0px;PADDING-TOP:0px;PADDING-LEFT:0px;PADDING-RIGHT:0px;} #ygrps-yiv-995521734 #ygrps-yiv-995521734ygrp-mkp .ygrps-yiv-995521734ad P { MARGIN:0px;} #ygrps-yiv-995521734 #ygrps-yiv-995521734ygrp-mkp .ygrps-yiv-995521734ad A { TEXT-DECORATION:none;COLOR:#0000ff;} On 05 Feb 2016 09:35:46 -0800 "nakedwaterskier@... [DSN_KLR650]" DSN_KLR650@yahoogroups.com> writes: The temperature differential between the hot block and the cold coolant solution would be reduced with the proper sized hole in the thermostat; especially in SoCal where I live...and where a Thermo Bob has much less utility.   <><><><><><><><> <><><><><><><><>   Every owner gets to decide what is right for their machine(s).   I'm guessing that you are guessing about temperature differential data for your situation.  It might be worth your time to take a look at Wattman's website and read/study some of the data he presents there.  He is not guessing.  He uses hightech data collection systems and understands the data he collects.  He developed the T-Bob back in about 2005/6 and there was much discussion on this site about it.  He also shared (on this site) a lot of data from his research.  He lives in AZ and rides year round.  Last thing I heard (within the last 6 months or so) he has over 130,000 smiles on his Gen I KLR and has never been into the top end of the engine.  I'll suggest that is the exception and not the rule but in my opinion it does speak well of the T-Bob.   There is no way I can fathom drilling a hole in a KLR stat would be an improvement of any sort.   Best, Jeff Saline The Beautiful Black Hills of South Dakota 75 R90/6, 03 KLR650 . . . . . . . . . . ..     ____________________________________________________________ [b]Ally Bank, Member FDIC[/b] Consistently competitive rates, 24/7 customer care, Member FDIC https://ad.doubleclick.net/ddm/clk/299707993;126233653;v
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Norm Keller
Posts: 712
Joined: Thu Apr 01, 2004 7:48 am

thermo bob vs drilling hole in thermostat

Post by Norm Keller » Fri Feb 05, 2016 12:54 pm

#ygrps-yiv-43938992 blockquote.ygrps-yiv-43938992cite {margin-left:5px;margin-right:0px;padding-left:10px;padding-right:0px;border-left:1px solid #cccccc;} #ygrps-yiv-43938992 blockquote.ygrps-yiv-43938992cite2 {margin-left:5px;margin-right:0px;padding-left:10px;padding-right:0px;border-left:1px solid #cccccc;margin-top:3px;padding-top:0px;} #ygrps-yiv-43938992 .ygrps-yiv-43938992plain pre, #ygrps-yiv-43938992 .ygrps-yiv-43938992plain tt {font-family:monospace;font-size:100%;font-weight:normal;font-style:normal;} #ygrps-yiv-43938992 a img {border:0px;}#ygrps-yiv-43938992 {font-family:Tahoma;font-size:12pt;} #ygrps-yiv-43938992 .ygrps-yiv-43938992plain pre, #ygrps-yiv-43938992 .ygrps-yiv-43938992plain tt {font-family:Tahoma;font-size:12pt;} The stock thermostat has a bleed hole to allow venting of air past the thermostat and produces a bit of recirculation. The effect is different from the thermostat bypass systems of which the Thermobobs are examples. The purpose of a thermostat bypass system is to recirculate and mix coolant within the engine in order to achieve a more uniform engine operating temperature. Bleeding coolant through the radiator simply acts to cool the engine by continuing to circulate cold coolant into the lower cylinder. I put together some information and explanation regarding bypass systems in this folder which may be useful. Please let me know if anything is unclear, appears to be incorrect, etc. Any suggestions as to how to improve the information may help someone. I'm happy to answer questions regarding cooling systems. One point which surprises many experienced technicians is that of the pressure in the cooling system. Ask anyone what is the pressure in the cooling system and they will usually respond with the value of the radiator cap pressure. This is the pressure while the thermostat is open but when the thermostat is closed, the water pump is pushing coolant into the lower engine and this pressure is applied against the thermostat. 50 PSI is not unusual while some newer Fords are reported to achieve over 100 PSI with thermostat closed. That little hole in the thermostat moves a lot of coolant and may be more responsible for the inability of the KLR to warm up under cold conditions than many believe. https://www.dropbox.com/sh/pwrq95427ptenur/AABiCBU5uMtpnilgMLael0I-a?dl=0 Here's a piece I wrote on the effects of air bubbles in the coolant which might be of interest: https://www.dropbox.com/s/kbixfk4wfaozxjs/Effects%20of%20air%20in%20coolant.doc?dl=0
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