MotorvateDIY Video: Inside the 370z Throttle Body

[MotorvateDIY]

Have you ever wanted to see the inside of your throttle body and see how it works? You may want to watch our latest episode:

[busterbull]

Interesting! Thanks!

[Krylon]

Well done and good info! Thanks.

[dts3]

Awesome video. I always thought the coolant lines were to actually cool the TB. I learned something new today

[JARblue]

Originally Posted by video

Believe it or not, it's possible to have ice buildup inside the throttle body at temperatures as high as 21 degrees Celsius or 70 degrees Fahrenheit

It's been a few years since I took high school chemistry, but I don't believe this is true. Pretty sure water still freezes at 0C/32F despite what the fake news media outlets are saying.

Now if we're referring to a hard freeze where ice did buildup and a quick enough temperature change that the ice did not have sufficient time to melt, sure, I can see that happening. But the statement in the video is a little misleading IMNSHO.

[dts3]

Originally Posted by JARblue

It's been a few years since I took high school chemistry, but I don't believe this is true. Pretty sure water still freezes at 0C/32F despite what the fake news media outlets are saying.

Now if we're referring to a hard freeze where ice did buildup and a quick enough temperature change that the ice did not have sufficient time to melt, sure, I can see that happening. But the statement in the video is a little misleading IMNSHO.

Well... without drawing any conclusions about what is said in the video, there is a such a thing as "freezing by evaporation" (I don't know of any exact term). If you spray a can of "compressed air" upside down, the liquid section of the propellant is sprayed from the can (which was only liquid under the somewhat high pressure of the can) The act of evaporating so quickly will cool the surrounding area (why we sweat) so fast that water vapor in the atmosphere will turn directly to ice, skipping the liquid phase. I'm not saying that this is happening in the TB, but how low is the pressure in there if the air is moving very fast across the butterfly plate?

Note: Spraying compressed air upside down on your skin will cause you to have a very bad day. Don't ask me how I know.

[JARblue]

Ok I could have been more clear and qualified that I was referring to a situation in one atmosphere of pressure. I really don't think the pressures in the intake system are anywhere near those needed for phase transition. But I've been wrong before.

[dts3]

Originally Posted by JARblue

Ok I could have been more clear and qualified that I was referring to a situation in one atmosphere of pressure. I really don't think the pressures in the intake system are anywhere near those needed for phase transition. But I've been wrong before.

This is what I would also think, but I figured I'd share my bad experience with playing around with compressed air because it possibly maybe somewhat applies here, lol. It's a cool effect if you keep it away from skin that is sensitive to frostbite.

[SouthArk370Z]

There is a drop in temperature when there is a drop in pressure. The TB is a restriction which induces a pressure drop. Same basic principle as an A/C unit.

I have a hard time believing one is going to get a 40F temperature drop across a TB. But it's been a few decades since I studied such things.

[Fountainhead]

am I the only one not seeing anything in the OP but a white box?
Am I missing a setting?

[SouthArk370Z]

I'm seeing a link: http://www.youtube.com/watch?v=HLQiu1kZ354

[Rusty]

Originally Posted by SouthArk370Z

There is a drop in temperature when there is a drop in pressure. The TB is a restriction which induces a pressure drop. Same basic principle as an A/C unit.

I have a hard time believing one is going to get a 40F temperature drop across a TB. But it's been a few decades since I studied such things.

Used to see carburetors ice up a lot at high rpms. When ever you have a pressure drop. You will have a temperature drop. This is how A/C works. Freon going through an orifice.

[MotorvateDIY]

Hey everyone...

Since the butterfly valve on a carb acts the same as on a throttle body, it creates a pressure drop,
and that lowers the temperature at the point of restriction. This is also known as "Carb icing".

From Wikipedia: (https://en.wikipedia.org/wiki/Carburetor_icing)

Carburetor Icing, or carb icing, is an icing condition which can affect any carburetor under certain atmospheric conditions. The problem is most notable in certain realms of aviation.

Carburetor icing occurs when there is humid air, and the temperature drop in the venturi causes the water vapor to freeze. The venturi effect can drop the ambient air temperature by 30-40 degrees F (16.7-22.2 degrees C), therefore carburetor icing often occurs when the outside air temperature is in the 60-70 degree F (15.6-21.1 degree C) range.

In researching this episode I was also surprised to learn this.

[SouthArk370Z]

Originally Posted by MotorvateDIY

... The venturi effect can drop the ambient air temperature by 30-40 degrees F (16.7-22.2 degrees C), ...
In researching this episode I was also surprised to learn this.

Wow! Thanks for the info. Never would have thought that the ∆P would be great enough to cause much of a temperature drop.