Napa filter and high Intake air temps? - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 32 (permalink) Old 06-26-2010, 02:17 PM Thread Starter
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Napa filter and high Intake air temps?

I know this filter flows more air but being a open element under the hood it takes the hot air from under the hood. I was towing this weekend and it was 80 deg out side temp the air intake sensor was reading 96deg and it traffic it was over 110deg. Is this killing power because the intake charge is hot air. I know my gas truck suffered when the intake air got to hot. In the winter months this is not a big deal but summer its getting pretty hot.

What do you think?
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post #2 of 32 (permalink) Old 06-26-2010, 02:31 PM
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Re: Napa filter and high Intake air temps?

Not hurting it at all.




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post #3 of 32 (permalink) Old 06-26-2010, 03:34 PM
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Re: Napa filter and high Intake air temps?

To help promote more cool(ambient) air flow directed right at the filter you can do the zoodad mod(I think it's called that) and use the tube from the stock airbox to shoot outside air right at the filter while you're driving. I think that gains will be minimal though and as Andy stated, the temps you are seeing are not hurting anything at all.

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post #4 of 32 (permalink) Old 06-26-2010, 04:01 PM
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Re: Napa filter and high Intake air temps?

Quote:
Originally Posted by Duanesz View Post
I know this filter flows more air but being a open element under the hood it takes the hot air from under the hood. I was towing this weekend and it was 80 deg out side temp the air intake sensor was reading 96deg and it traffic it was over 110deg. Is this killing power because the intake charge is hot air. I know my gas truck suffered when the intake air got to hot. In the winter months this is not a big deal but summer its getting pretty hot.

What do you think?
Just watch your EGTs. If the IAT is too high, EGTs will follow.

Part of the reason the gas vehicle suffered from less power is that when the air heated up, it expanded. So less mass for the same volume. But, carburetors and FI systems meter the fuel according to air mass, not air volume. So, less air mass, less fuel.
In the diesel, the FI system meters the fuel in accordance to the pedal, and the air is just along for the ride, so to speak. when the air gets thinner, the turbo will partially make up for that by itself because it will spin faster, pushing a higher volume of air into the engine, attempting to reach the necessary air mass flow rate. Since the turbo is driven by exhaust gasses, the higher the amount of fuel, the more gas is available to the turbo. So, while fuel efficiency would go down, power really is not affected as much.
But for 20-30 degrees, you're not going to notice the difference in fuel efficiency.

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post #5 of 32 (permalink) Old 06-26-2010, 10:07 PM
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Re: Napa filter and high Intake air temps?

Excellent explanation Dan!
Best,
Jim

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post #6 of 32 (permalink) Old 06-27-2010, 02:20 AM
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Re: Napa filter and high Intake air temps?

well at least it made sense to someone. I had to rewrite it three times before I thought it was reasonably clear.

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post #7 of 32 (permalink) Old 06-27-2010, 03:35 AM
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Re: Napa filter and high Intake air temps?

My explanation was the Cliff Notes version. But I agree, nice job.




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post #8 of 32 (permalink) Old 06-27-2010, 05:01 AM Thread Starter
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Re: Napa filter and high Intake air temps?

Allright it makes sense now thanks for the input. I still think I will do the zoodad mod to help with intake temps.
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post #9 of 32 (permalink) Old 06-27-2010, 10:22 AM
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Re: Napa filter and high Intake air temps?

Quote:
Originally Posted by cowboy_dan View Post
Just watch your EGTs. If the IAT is too high, EGTs will follow.

Part of the reason the gas vehicle suffered from less power is that when the air heated up, it expanded. So less mass for the same volume. But, carburetors and FI systems meter the fuel according to air mass, not air volume. So, less air mass, less fuel.
In the diesel, the FI system meters the fuel in accordance to the pedal, and the air is just along for the ride, so to speak. when the air gets thinner, the turbo will partially make up for that by itself because it will spin faster, pushing a higher volume of air into the engine, attempting to reach the necessary air mass flow rate. Since the turbo is driven by exhaust gasses, the higher the amount of fuel, the more gas is available to the turbo. So, while fuel efficiency would go down, power really is not affected as much.
But for 20-30 degrees, you're not going to notice the difference in fuel efficiency.
Wouldn't the trip through the CAC cool it some?

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post #10 of 32 (permalink) Old 06-27-2010, 11:07 AM
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Re: Napa filter and high Intake air temps?

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Originally Posted by Fddriver2 View Post
Wouldn't the trip through the CAC cool it some?
It would cool it some. But, you never are able to remove as much heat as you put in. So if IAT pre-turbo goes up 20 degrees, the post turbo, pre-cac will go up a little more than 20 degrees (little like 20.005), and the post-cac will go up less than 20 degrees. The post-cac would go up something around 5-15 degrees, depending on air flow in the cac, and outside the cac. The more (mass) airflow you have IN the cac (going into the engine), the more (mass) airflow you need on the OUTSIDE of the cac to maintain close to the same cac outlet temp.

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