The coolant temp sensor is in the head.
Cooling Fan On/Off
- Thread starter XTRAWLD
- Start date
It will get hotter after it is shut off. Up to 200 degrees hotter as a matter of fact. This is heat soak and it happens to all water cooled engines. After the engine is shut off, the coolant stops circulating. This causes the already hot coolant to stay in the engine thus making the engine hotter. This is why the cooling fan will come on all by itself when the key is turned off. It's all about protecting the engine.
Yes it is in the cylinder head because that is where the most friction is thus creating the most heat. It needs to placed where it is hottest so it can protect against overheating.
However, the difference is that car engines are in a tightly enclosed compartment, along with other heat-producing compnents (AC condenser, auto trans, sometimes a catalyst in the exhaust manifold). Bike engines are better able to passvely shed heat, which is why air cooled designs are still around.
Bottom line, if your bike's not boiling over, is all good. Where's the frickin' peace, love, and happiness smiley??
Any engine does heat soak for few minutes after shut down... they all do that and it's no big deal!
The only thing that you need to let cold down is a turbo... or it will cease after a good beat up. Don't worry about your bike... it's all going to be fine...
The only thing that you need to let cold down is a turbo... or it will cease after a good beat up. Don't worry about your bike... it's all going to be fine...
Heat soak will happen no matter when you shut it off. I was comparing idling the engine to cool it down before shutting it off. The heat soak will happen after you've idled it as well, so there is no benefit to idling the engine to bring the temp down a few degrees before shutting it off.
The only way to effectively mitigate heat soak in an exposed motorcycle engine is if you have an electric water pump that will circulate the coolant while the engine isn't running and then the fan can draw air through the rad to cool the coolant, that is then circulated through the engine to cool the engine. The fan running without the coolant circulating doesn't do much, hence the reason Yamaha doesn't keep it running for a few minutes after you shut down the bike.
Point taken. Good argument though. Thanks...
Thanks for the friendly banter!Here's a noobish question along the same lines. I read the owners manual regarding the temperature display, and it says not to ride the bike if it is overheating. What temperature constitutes overheating? (Manual doesn't say). Or does the gauge go from displaying the temperature to displaying a warning and I basically don't have to worry about it unless it does that?