View Full Version : Engine temperatures

07-01-2007, 06:21 PM
Do all engines run about the same temperatures? I have an 800cc buggy that I've just installed
some gauges. The fan turns on about 185ish then cools to about 175. Is that to cold or too hot?
Are there different temp fan sensors?

Thanks Joe

07-01-2007, 06:48 PM
Thats probbaly optimal temp for a 4 stroke, My fan comes on about 195 and off at 180, today in my 10 laps i seen temps running 205, I may have cooling issues, only time will tell....

07-01-2007, 07:09 PM
What are you riding?

07-01-2007, 07:13 PM
Its in the project section, 2002 gsxr 600, 880 lb car....

07-01-2007, 07:31 PM
I saw your buggy your working on. Awesome ride. How much is left to finish?

07-01-2007, 07:33 PM
My 2003 CBR600 fan kicks on at 220. *Off at 200.

07-01-2007, 08:25 PM
My thermo switch is in the return line or hot line of my oil cooler, It is set at 185 on 170 off, according to the dash it turns on at 195 and off at 180...

I ran 10 laps with it today, besides making it look pretty it is running...

07-01-2007, 09:57 PM
Congratulations bug, you got it done. Did it do alright, what are you gonna do now? May or may not be running hot. Keep on checking, then keep on racing.

07-01-2007, 10:08 PM
I've noticed in my buggy when the engine runs over 190 it seems to run better. How can I keep it closer to 200 than 180 ?

07-02-2007, 10:15 AM
Get a new fans switch that turns on at a higher temp.

07-02-2007, 04:14 PM
And maybe a thermostat....Jegs sells thermoswitches..

07-02-2007, 05:06 PM
I would advise finding what the coolant temps for your engine are from the manufacturer - as in go find a service manual, look up the cooling section and see where they say things should work.

Then, I'd use the OEM sensor/thermostat or an equivalent to the OEM unit to keep the engine in that range.

We can all guess back and forth where it's supposed to run, but unless you have the info from the manual, it's all just guessing. * It's easy enough to get the correct answer if you really want it. *[smilie=biggrin.gif]

Still, just to throw out some more (useless?) info, the fan on my street bike (VFR800) doesn't come on until it hits 220, turns off at 200.

07-02-2007, 05:24 PM
Thanks for the info. I am wondering also why the fan fuse holder keeps melting .Not the fuse burning. One of our last rides, I wound up hard wiring the connection, *the temp. and fan ran more consistant, is a fuse necessary? The wiring does seem very thin for the fan.

Thanks Joe

07-02-2007, 05:48 PM
what size wiring?
My fan draws 9.8 amps. thats like 12 ga minimum...

07-02-2007, 06:24 PM
Mine draws around 9-10amps. also and the wireing from the alt. is about 18-20 gauge. The entire buggy wireing is half ass done anyways . The lighting also melts the fuse holders and that is very thin. Looks like I'll be an electrician this weekend.

07-02-2007, 06:29 PM
you should have your fan running on a relay, Supply to the fan 10 ga, supply to the relay from battery with inline fuse or circuit breaker 10 ga, supply to trigger relay about 14 ga...IMO, As kfab pointed out "useless" info, All tho most info on this site is "useless" to someone....And oem is not always best to go by IMO....

07-02-2007, 06:46 PM
Any info is better than none. It helps the trial and error asspect. I can't get rid of the urge
to make it work better when something so little holds you back. thanks for the info.

10-05-2007, 06:31 PM
Just for reference, my service manual says the thermostat opens at 186.5 and the fan turns on at 220 and off at 212!!

10-05-2007, 06:35 PM
oh, looked at it again. opens at 180, has atleast .31 inches of lift of 203 degrees if that means anything.