Oil Change - why 2 drain plugs??

[Many brands]

Two plugs to do the oil change.. One is a "Sump Tank" ? And one is the "Motor Pan" ? When re-filling, the oil of course fills them both? Whey then two plugs ?

 

[BoilerAnimal]

Without two drains there would be old oil left in which ever didn't have the drain. I guess a simple way to think of it would be to think of one as a drain for a storage tank and the other as a drain for the place where the oil is used. Each has oil in it.......at least they should........and each needs to be drained separately.

 

[4 MARIE]

I won't say much, except you may want to Google "dry sump engine design"
then you will be able to sound informed.

 

[IdahoMtnSpyder]

Two plugs to do the oil change.. One is a "Sump Tank" ? And one is the "Motor Pan" ? When re-filling, the oil of course fills them both? Whey then two plugs ?

One is the sump of the motor proper. The other is in the clutch cover. It's two reservoirs of oil, one for the engine and one for the clutch. The oil circulates through both but they are not one reservoir.

 

[BajaRon]

2 oil compartments. 2 drain plugs. 1 fill point.

The Spyder uses a 'Dry Sump' oil system. This is to reduce the overall size of the engine. In a car the oil reservoir is in the pan which extends quite a ways below the engine. With the Spyder, this 'Oil Pan' is relocated remotely to a more appropriate area making the engine smaller and able to be mounted lower in the frame. This lowers the center of gravity and seat height, among other things.

 

[KX5062]

Dry sump engines also maximize horsepower and torque by reducing what is commonly called "windage loss", although that term is not technically correct. (It should be called hydrodynamic loss.) This refers to the loss of power when the crank and other moving parts in the bottom of the engine meet resistance inside the oil bath of the sump.

https://en.wikipedia.org/wiki/Windage