[xBhp Universal Thread]: Oil cooled vs Liquid cooled

[Anupam Shrivastava]

what is the difference between Oil Cooled and Liquid cooled engines? which is better and why?

[Aryan]

Topic Approved.

[Synn]

The "Oil cooled" deal is a misnomer. Basically, there is a small cooler for the engine oil to help it maintain optimal viscosity. That's about it. The engine is still air cooled.

Liquid cooled engines have a proper pump driven setup that circulates a fluid that cools the engine.

[Sandeep_K_Ram]

The standing joke on xbhp was that BAL forgot to add "is" in between "Oil Cooled" on the P200

On a BAL P200/220 the oil is being cooled to help maintain its viscosity , whereas in a real liquid cooled bike, there is a liquid that is pumped around the engine just for the sake of cooling it down.

[Mindgrinder]

ok whats the point of maintaining viscosity?

Btw if i am right liquid cool, works the same as coolant in a car or a nuclear reactor.

[BANDHAV]

Maintaining viscosity/thickness of oil is done to maintain the optimum level of lubrication of engine.

[HydBiker]

and yes. liquid cooled in cars & bikes is the same... yes similar to that used in a nuclear reactor...

Synn & Sandeep summed it up. Guess the thread can be closed!

[Anupam Shrivastava]

Thanks to each one of you for the clarification

[Praful]

Thanks to each one of you for the clarification

Quick koshun: Can someone list all the functions of an Engine Oil in our wet clutch bikes?

PS: This is not OT!

[Mindgrinder]

Quick koshun: Can someone list all the functions of an Engine Oil in our wet clutch bikes?

PS: This is not OT!

Dry clutches are used to reduce internal engine losses from friction due to oil cavitation. In a perfect world they are exposed to the air stream and are kept cool. In real life, they overheat on the grid and generally become useless after 20 seconds of 'dragged engagement'. They require frequent replacement and (as noted previously) are very noisy when disengaged.

As far as i know most MOTO GP bikes run on dry clutch

[Trigger]

^^AFAIK, cars generally use dry clutch. But they do last long.

[MavericK46]

Dry clutches are used to reduce internal engine losses from friction due to oil cavitation. In a perfect world they are exposed to the air stream and are kept cool. In real life, they overheat on the grid and generally become useless after 20 seconds of 'dragged engagement'. They require frequent replacement and (as noted previously) are very noisy when disengaged.

As far as i know most MOTO GP bikes run on dry clutch

ALL the MotoGp bikes (800cc premier class atleast) rather than MOST is the case
Wet clutches rely on the plates being bathed in the engine oil for cooling and hence im guessing aren't very weight and hence performance effecient.

P.S : OF, Akhil, Ken da, Synn saar.. Enlightenment sought !

[jayprashanth]

IIRC, the TVS Excel Sport or the TVS Champ ran a dry clutch I was quite startled to know this too. A very old supplement issue of Overdrive carried news about this.

The Hero Honda Pleasure/Honda also run Dry Centrifugal clutches, albeit in automatic guise.

Mindgrinder,

They don't need frequent replacement but yes, it seems that they make a rattle. But the fact is, they do a better job of transmitting the high power outputs to the rear wheel as there is less friction as the clutch doesn't sit in an oil bath.

[Mindgrinder]

IIRC, the TVS Excel Sport or the TVS Champ ran a dry clutch I was quite startled to know this too. A very old supplement issue of Overdrive carried news about this.

The Hero Honda Pleasure/Honda also run Dry Centrifugal clutches, albeit in automatic guise.

Mindgrinder,

They don't need frequent replacement but yes, it seems that they make a rattle. But the fact is, they do a better job of transmitting the high power outputs to the rear wheel as there is less friction as the clutch doesn't sit in an oil bath.

well one of my frnd in canada owns a duke, he told me that it still needs replacement compared to normal wet clutch, so many ppl who are enthu, try clutchless shifts at times, to avoid oil cavities. I do not know much detail though

[HydBiker]

Quick koshun: Can someone list all the functions of an Engine Oil in our wet clutch bikes?

hmm, let me try:
1) Lubrication
2) Cooling / maintain temperature
3) Cleaning

IIRC, the TVS Excel Sport or the TVS Champ ran a dry clutch I was quite startled to know this too. A very old supplement issue of Overdrive carried news about this.

TVS mopeds use a dry clutch cooled by air. I guess they are the same even now. Yes, they needed much frequent replacement than the wet clutches in the bikes.