Oil themostat-engine temp

[greenmonster]

Thinking bout the issue of engine temp in colder places,
many thermostats are fully open at around +80C.
Why not just above 100, as this is closer to ideal engine temp , evaporates water from oil etc?
Some offer above 100 but standard seems to be around 80.

[ducpainter]

Are you referring to water thermostats, or oil?

In the US, everything is now built to run at 195⁰F water temp.

I think the manufacturers of the thermostats are concerned about oil flow/volume.

[greenmonster]

Oil thermostat.
195, enough to get rid of water?

[ducpainter]

Seems to be.

No idea what the oil temp might be at 195 water temp.

[Howie]

Oil thermostat.
195, enough to get rid of water?

195 will get rid of water, though slowly as compared to 212 and up.  The thermostat is controlling minimum temperature once the oil is warm, like high speed on a cold, moist day when the the cooler might be working too well.  I'll use my car as an example, though it does not have an oil thermostat.  The system in my car uses coolant to both heat and cool the oil.  During warm up oil temperature lags behind.  After driving for a while the oil tends to be hotter than the coolant.  On a day like today typical numbers would be 195 for the coolant, 217 for the oil.

[Speeddog]

That adds a bit of extra sense for a coolant/oil Hx that I hadn't seen.

[stopintime]

I installed one from Pegasus racing a few years ago. It was a small one (the smallest?), but still let way too much oil through the bypass canal. That would have resulted in a situation with NO oil, cold or hot, ever reaching the cooler.

I'm not sure if there is a thermostat out there which will flow the correct amount of oil, low rev pressure/high rev pressure, all the time...

I solved my temperature issues by de-tuning my engine - Power Commander deliver more fuel at max throttle and high revs (=top speed and/or racing), but had a plan to install a manual bypass valve.

[greenmonster]

"I installed one from Pegasus racing a few years ago. It was a small one (the smallest?), but still let way too much oil through the bypass canal. That would have resulted in a situation with NO oil, cold or hot, ever reaching the cooler."

When oil reached like 80 degrees, didn`t the bypass shut? If not, it did not work properly.
Or am I missing something?

[stopintime]

.....
When oil reached like 80 degrees, didn`t the bypass shut? If not, it did not work properly.
Or am I missing something?

The main valve was closed and only opened at high temperatures (tested), but the bypass remains open. I'm guessing it has to have a bypass canal so the oil flow isn't ever blocked. If so, we need quite specific canals to allow enough oil to always pass, but not so much that it chooses that direction instead of via the cooler.

[greenmonster]

"As oil warms to 180 degrees (200 in high
temp versions) the operating "waxstat" closes the
bypass permitting full flow to cooler"
http://50.62.235.225/files/thermos$.pdf , page 5, Mocal thermostats.

http://derale.com/products/fluid-coolers/thermostats-1/fluid-control-thermostats/13011-detail , check video.

https://www.pegasusautoracing.com/pdfs/1226OilThermostat.pdf , Pegasus seems also to be a standard wax stat.

Starting to examine engine temp, seems like (IF the instrument panel gives correct reading...) oil cooling systems on many
2V works fine in +30C, too low in most normal climates...
A thermostat
1. to lower warmup cycle time
2. to give engine always optimum engine working temp
seems like an idea.

[stopintime]

https://www.pegasusautoracing.com/productselection.asp?Product=1228

This is what I had ^

This is probably what happened. Not a problem for most applications, but it didn't work on my bike.

When the valve is closed, it has a slight relief to make up for restrictions elsewhere in the system; such as a stacked
plate coil, a coil that is too small or small restrictive oil lines.

[greenmonster]

"A correctly designed thermostat will never be fully open or fully closed while the engine is operating normally, or overheating or overcooling would occur."

Says Wikipedia.

Wonder what the reasons are why few Ducs have this mod?
Do 2V racers do this?
When you look at this faq, seems pretty safe:
 http://oilthermostats.com/faqs/
 

[stopintime]

I can't remember the name, but quite a few Monsters had a thermostat when a well functioning was for sale.

German engine builder Kämna (and probably more) make a special cooling system for race bikes. The oil flow is rerouted so the warmest places gets the coolest oil. 

[Speeddog]

"A correctly designed thermostat will never be fully open or fully closed while the engine is operating normally, or overheating or overcooling would occur."

Says Wikipedia.

Eahhh, yeah, technically correct, but IMO only achievable in real life with a relatively narrow environmental window in an application with large cooling 'supply'.

My S4 will control the coolant temp with the thermostat, up to 180degF (or whatever the stat full-open temp is).
Beyond that, it's only controlled by air temp and air flow.
Small radiator and tiny fans do not make a wide-range cooling system.
It likely is using a bit less fuel to go the same speed, but my S4 radiator is ~25% the size of the one in my Saturn.

Even tinier oil cooler, and no fans.... even though the heat load is less from the oil, still, the cooling power is small, and very small when the bike is stationary.

I'd put a thermostat between the 2 ports, on the back side of the oil cooler.

Wonder what the reasons are why few Ducs have this mod?
Do 2V racers do this?
When you look at this faq, seems pretty safe:
 http://oilthermostats.com/faqs/
 

[PA DL]

What do yo think optimal oil temp should be?