oil bypass spring M695

[cencalal]

I'm adding an oil cooler to my M695 - I'm new to Ducati, so excuse me if this question is...etc.
Do I really need the bypass spring?  Where I live the temp rarely drops into the twenties, and I never ride if it's below about 50º, so will the engine warm up be affected all that much if I don't install the spring? I'll be using 10/40 synthetic oil, which doesn't really change viscosity when cold...

Thanks
Alan

[BK_856er]

I'm adding an oil cooler to my M695 - I'm new to Ducati, so excuse me if this question is...etc.
Do I really need the bypass spring?  Where I live the temp rarely drops into the twenties, and I never ride if it's below about 50º, so will the engine warm up be affected all that much if I don't install the spring? I'll be using 10/40 synthetic oil, which doesn't really change viscosity when cold...

Thanks
Alan

It's not a thermostat, it's a bypass.  You need it when retrofitting an oil cooler to a bike that didn't come with one from the factory.  Adding a cooler will help with those temp spikes you might get when stopping at a light, and it'll cool faster when you get going again and have some air flowing, but the average running temp won't change all that much.

BK

[Speeddog]

The bypass spring allows oil to continue to circulate even if the oil cooler gets clogged, or a line gets pinched closed.

[ducpainter]

<snip> but the average running temp won't change all that much.

BK

That hasn't been my experience with my M900. In cold weather... ~40F... the bike will never come up to temp or get hot enough to boil the moisture out of the oil. In cold temps we usually cover the cooler to reach a reasonable operating temp.

[cencalal]

I see - thanks for the quick responses.  I have the part - just was wondering about another thread that talked about the oil being too thick from cold being diverted from the cooler.

[Speeddog]

Further detail, it 'closes off' the port that normally feeds oil straight from the oil pump to the filter.

So if you don't fit it when you put the cooler on, very little oil will go through the cooler.

[BK_856er]

That hasn't been my experience with my M900. In cold weather... ~40F... the bike will never come up to temp or get hot enough to boil the moisture out of the oil. In cold temps we usually cover the cooler to reach a reasonable operating temp.

Point well taken.  Sometimes I forget not everyone lives in California.  

BK

[bshinn]

Listen to Speeddog!