fan
Posted: Mon Jun 20, 2011 9:40 pm
Watt-Man's own charts show a 15 degree increase in oil temp on mild highway driving. If you're flogging it like a rented pony, this will be even more severe.
Talk to any engineer, you know - the kinds with degrees and stuff, and they will be the first to tell you that heat (especially in the oil) is the enemy.
If you live in Icybunghole, Alaska I MIGHT see the use for one. Down here in the lower 48, I think it could do more harm than good.
-Jeff Khoury
From: "Jeff Saline"
To: speedway@...
Cc: "DSN KLR650" DSN_KLR650@yahoogroups.com>
Sent: Monday, June 20, 2011 7:23:36 PM
Subject: Re: [DSN_KLR650] Fan
On Mon, 20 Jun 2011 14:56:11 -0000 "speedwaytravelincom"
< speedway@... > writes:
<><><><><><> <><><><><><> speedwaytravelincom, I don't know about the 2008 and later models (version II) but the version I (1987-2007) fan switch should turn on at 201 degrees F and turn off at 196 degrees F. Might be helpful to remember the fan switch is located at the bottom or coolest part of the radiator and the temperature sender is located in the head. So the temp on the temp gauge won't be the same as the temp at the fan switch. It'll be significantly warmer. Now just a quick comment about the T-Bob. Up front it might be helpful to know I think it's a good thing for anyone that rides at temps below 70 degrees F. If you always ride in warmer temps I think it's can be helpful. The stock KLR650 cooling system has two issues. It comes with a stat that is 160 degrees with no by-pass so the engine doesn't warm up very fast or to what many experienced techs might consider a good temperature. The cooling system is also limited in its ability to cool by the size of the radiator and capacity of the system. Once the stat is fully opened from the engine reaching that temp the stat no longer is involved in regulating the system temperature. The radiator is now controlling the temp based on air temperature and flow over/through it. The T-Bob addresses the first issue by using a 195 degree F stat and a by-pass system. The 195 degree stat brings the temp higher than the stock stat by 35 degrees F. The by-pass speeds up the heating of the engine by by-passing the radiator about 100% when the stat is closed and maybe by about 15% of the coolant flow (if I recall correctly) when the stat is fully open. So the engine gets hotter faster and then the change in coolant temperature at the engine when cooler coolant from the radiator is introduced when the stat opens is reduced. I think the stock system has a fluctuation of about 80 degrees F with the stat opening and closing. The T-Bob has a change of about 10-15 degrees F. I think Wattman told me the T-Bob might have an engine in hot weather running up to 3 degrees F hotter than a stock system. That's not enough to be concerned about in reality. Best, Jeff Saline ABC # 4412 South Dakota Airmarshal Airheads Beemer Club www.airheads.org The Beautiful Black Hills of South Dakota 75 R90/6, 03 KLR650, 79 R100RT . . __________________________________________________________ Groupon™ Official Site 1 ridiculously huge coupon a day. Get 50-90% off your city's best! http://thirdpartyoffers.juno.com/TGL3141/4e00011646f3af3427st06vuc [Non-text portions of this message have been removed]> When should the fan start running? At the half way mark, three > quarters or hoter?