Idle Cool Down

[JMod45]

The H2SXSE is my first vehicle to have any type of forced air intake. A few months ago I bought a turbo diesel truck, and been researching modifications, maintenance, etc. for it.

Something I came across says that you should let the truck sit at idle until the temperatures drop, to prevent anything from overheating. In this case, I believe that is due to the turbo being liquid cooled, and if you shut the engine off, the fluid quits flowing, and can become burned if it stops against a hot turbo.

I realize that a supercharger doesn't get anywhere near the temps of the turbo, but since it does heat up while under load, wouldn't it be a good idea to let the bike idle for a minute or so before shutting down in order to cool everything down a bit?

[Snakes709]

If you are riding hard yes. I recently did a track day. I would do a cool down lap, circle around the pits and let it idle for a minute or so to let things circulate. If you are just casually riding on the street, no need. Chance are you are going to increase temps by just idling and not riding.

[Reciprocal]

I do this.

[steadly2004]

I think just idling keeps the oil very hot. Not sure if it would be hotter than the supercharger or not. But maybe just some slow riding, like mentioned above would cool it better. On hot days the bike heats up at stops with idling when compared to moving.

Also like you mentioned a cool down isn't as necessary with superchargers in general. Usually the aftermarket parts is named a turbo timer, since the exhaust is MUCH hotter than intake.

I personally don't think it's necessary. But I also haven't the skill to push the bike to the point of being VERY hot either.

[danham]

Turbos require this; superchargers do not (though after very hard riding cool-down is good for the whole engine, but not by idling). The turbo keeps spinning when you shut the key off -- as fast as 100,000 RPM if you have been hammering it -- and when the crankshaft stops, so does oil flow and the turbo can cook its bearings. The supercharger is tied to the crank by a chain (and planetary gears), so it stops when the engine stops.

-dan