Low temperature thermostat?

customboss · May 15, 2022

3 minutes ago, Grumpy Bear said:

Enough people believe it that marketing uses the term successfully. The rest of us know "Weight" when used like this means "Grade", An agreed viscosity spec at 100 C.

We use the terms heavy and light to describe the viscosity of a pancake batter. Sometimes stuff just sticks

Thats too grey for me, people need to get "MORE SMARTER"

Grumpy Bear · May 15, 2022

2 hours ago, customboss said:

That's too grey for me, people need to get "MORE SMARTER"

Lord man, have you met people?

:rolleyes:

Communication is nearly impossible. Everyone has their own DICTIONARY. Their own "SCIENCE". BELIEF has become a proxy for TRUTH. GOOD is BAD and BAD is GOOD. The snowflakes are so plentiful they've become all alike.

:banghead:

:rant:

customboss · May 15, 2022

2 hours ago, Grumpy Bear said:

Lord man, have you met people?

Communication is nearly impossible. Everyone has their own DICTIONARY. Their own "SCIENCE". BELIEF has become a proxy for TRUTH. GOOD is BAD and BAD is GOOD. The snowflakes are so plentiful they've become all alike.

This where Soylent Green comes into play. Or Covid. ‍

etex211 · May 17, 2022

Nascar runs electronic fuel injection now, and they routinely run their water temps at 250 degrees. If they made more power at 220 or 180, they'd let more air through to run them cooler.

It is true that closing off the nose for aerodynamic reasons is a component of this, but everything begins with the horsepower.

With the new car that was introduced this year, they are no longer allowed to put tape over the grill opening, but they still allow the engines to run hotter, certainly not at 170 or 180.

pokismoki · May 17, 2022

what fuel do they used at 250 water temp? every strategy has a reason, running 250F at extreme high loads may just be as cool as they can obtain with minimum drag.. do they even use thermostats? I wonder if they just use a flow restrictor instead?

for comparision, what temps do F1 race cars operate at?

I have a 170, stat, and it only operates in the 180-190 temp zone if i keep the throttle conservative and the loading reasonable on the motor. I hit 200 F doing 2 wot 1/4 mile passes. so i tend to think Nascar cars cannot maintain low temps under the loading they operate at.. I'm sure they would love to get them to operate cooler for durability but it may not be feasable

Edited May 17, 2022 by pokismoki

etex211 · May 17, 2022

12 hours ago, pokismoki said:

what fuel do they used at 250 water temp? every strategy has a reason, running 250F at extreme high loads may just be as cool as they can obtain with minimum drag.. do they even use thermostats? I wonder if they just use a flow restrictor instead?

for comparision, what temps do F1 race cars operate at?

I have a 170, stat, and it only operates in the 180-190 temp zone if i keep the throttle conservative and the loading reasonable on the motor. I hit 200 F doing 2 wot 1/4 mile passes. so i tend to think Nascar cars cannot maintain low temps under the loading they operate at.. I'm sure they would love to get them to operate cooler for durability but it may not be feasable

I think I can answer some of your questions...

Every Nascar national touring series runs gasoline for fuel. In fact, the gasoline is a spec item and purchased at the track.

They do not run thermostats in Nascar engines. I do not know if they restrict the water in any way or not. For about the final 15 years that I ran my short track cars, I didn't run any kind of restrictor for the water. Maximum cooling efficiency is obtained when you have maximum coolant flow.

I do not know what kind of water temps F1 cars run with. I don't pay a lot of attention to F1.

Howard Stewart used to have a great cooling guide on his water pump website. That guide continued after he sold out his business to EMP a number of years ago. I just went looking for it, and it appears that the Stewart EMP site is either down or moved somewhere else. In that guide, Stewart debunked a bunch of the old wive's tales about cooling. The old wive's tale about needing to restrict the water was one of the debunked ideas.

The fact that your engine runs hotter when you run it harder probably has a lot more to do with airflow than with coolant. 90% of all cooling problems are air flow problems. If your coolant temp is 200 when it really matters most, then your 170 thermostat doesn't appear to doing much of anything for you. If you want to run cooler, then your answer probably lies with your fan, your shroud, and the ducting in front of your radiator.

The last few years I ran my stock car on dirt, my temps never got over 180, even in the heat of the east Texas summer. I was running a Stewart water pump, no water restriction of any kind, a CV products copy of the old GM 4 blade fan, and a really good fan shroud. That motor was a flat top 400 with Vortec heads. My fuel was 20% 108 octane racing fuel and 80% 93 octane pump gas...

I forgot to mention above that the fuel also plays a huge role in cooling.

Edited May 17, 2022 by etex211

Grumpy Bear · May 17, 2022

15 hours ago, etex211 said:

Nascar runs electronic fuel injection now, and they routinely run their water temps at 250 degrees. If they made more power at 220 or 180, they'd let more air through to run them cooler.

It is true that closing off the nose for aerodynamic reasons is a component of this, but everything begins with the horsepower.

With the new car that was introduced this year, they are no longer allowed to put tape over the grill opening, but they still allow the engines to run hotter, certainly not at 170 or 180.

Entirely different world from NHRA. No one there running 5W oils...right?

etex211 · May 17, 2022

4 minutes ago, Grumpy Bear said:

Entirely different world from NHRA. No one there running 5W oils...right?

Nascar used to qualify on 0w0. I don't know what they use now. A lot of the old qualifying practices have been abolished by the sanctioning body, mostly to control expenses.