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Old 12-13-2019, 11:24 AM   #11
340Cuda
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Default Re: How Much Does Density Altitude Affect ET

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Originally Posted by Ralph A Powell View Post
Percent of oxygen changes can have a big impact and since very few measure this the basic numbers can remain the same but the percentage of oxygen can change and have a large impact!
So at the same DA the percent of oxygen can be different?

How do you measure the percent of oxygen?

Thanks
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Old 12-13-2019, 12:42 PM   #12
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Default Re: How Much Does Density Altitude Affect ET

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So at the same DA the percent of oxygen can be different?

How do you measure the percent of oxygen?

Thanks
There are many different combinations of Temperature, Relative Humidity, and Barometric Pressure that will give you the same Density Altitude, say 2500 feet. The car should perform similarly in any of those combinations that equate to a DA of 2500 feet, but it can vary depending on the exact makeup of those measures.

I'm pretty sure your weather monitor needs to have an oxygen sensor if you want that info.
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Old 12-13-2019, 12:44 PM   #13
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Default Re: How Much Does Density Altitude Affect ET

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So at the same DA the percent of oxygen can be different?

How do you measure the percent of oxygen?

Thanks
You have to have a weather station that measures the percent of oxygen. I know Altronics has them as an option.

I mostly look at the humidity and the barometer to make comparisons. The 327 engine that I am running is much more difficult to dial than the 350 that I have. Must have something to do with the shorter stroke.
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Old 12-13-2019, 01:24 PM   #14
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Default Re: How Much Does Density Altitude Affect ET

Patrick Hale's book is very helpful and has lots of information on this subject.

http://www.dragracingpro.com/site/90...ooks.html#2859
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Old 12-13-2019, 01:34 PM   #15
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Default Re: How Much Does Density Altitude Affect ET

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Patrick Hale's book is very helpful and has lots of information on this subject.

http://www.dragracingpro.com/site/90...ooks.html#2859
the link doesn't work for me ???
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Old 12-13-2019, 02:21 PM   #16
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Default Re: How Much Does Density Altitude Affect ET

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the link doesn't work for me ???
Try this one...

http://www.dragracingpro.com/Books.html
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Old 12-13-2019, 05:44 PM   #17
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Default Re: How Much Does Density Altitude Affect ET

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So at the same DA the percent of oxygen can be different?

How do you measure the percent of oxygen?

Thanks
With a oxygen meter there was a company in the Baltimore area the sold them. I will do some digging and post there name.
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Old 12-13-2019, 06:07 PM   #18
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Default Re: How Much Does Density Altitude Affect ET

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You can probably guess one of my New Year’s resolutions.
Right there with you Jimbo, I just recently came to the same conclusion!
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Old 12-13-2019, 07:42 PM   #19
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Default Re: How Much Does Density Altitude Affect ET

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thanks
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Old 12-13-2019, 07:55 PM   #20
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Default Re: How Much Does Density Altitude Affect ET

What do you use.
DA OR CF
AND WHY
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