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  #51  
Old 08-03-2010, 09:34 AM
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Wow that camera does thake some nice pics. The colors are so vivid in them.
Awesome video as well. Jamiriquoi (sp) very nice choice for the footage!!
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  #52  
Old 08-03-2010, 09:45 AM
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Originally Posted by MDH33 View Post
A great hypothesis was brought up regarding why so many rigs vapor locked. Could it be the high Ethanol content of the fuel we have today? Possible, I think. Probably vaporizes at a lower temp than "real" fuel would.
First Martin, thank you for posting those photos!

Second, I decided to do a little investigating about the EtOH theory. Turns out that the hypothesis is supported by the chemistry. From Wiki, here is a graph of EtOH vapor pressure versus temperature. Remember, that the definition of boiling is when the vapor pressure of a liquid is equal to the ambient pressure.



From that graph, we can see that the temperature at which the vapor pressure equals one atmosphere (760 mmHg, or nominal sea level), is about 75C. Obviously, we were much higher than that, I would guess around 500 mmHg. For reference, the atmospheric pressure in Denver is about 620 mmHg.

Heptane is a component of gasoline so I looked it up. It is a much larger molecule, and thus has a much lower vapor pressure. At sea level it boils at a little over 98C.

Here is a good link to the Wiki page on vapor lock. The explanation is spot-on.
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  #53  
Old 08-03-2010, 10:20 AM
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Dude you just locked up my brain........
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  #54  
Old 08-03-2010, 10:27 AM
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Could be. On the other hand it was a relatively cool day, especially on top of the passes it was down right cold. We were all pretty much using the same type of fuel, why then did many of the mechnically pumped, carbbed vehicles never skip a beat?

Several of the "vapor lock" issues I saw appeared to actually be engines loading up from being too rich. That could be due to a carb needing rebuilt, floats too high, sea level jets at high elevation, ignition timing not set for high elevation, etc. All of those things are amplified at elevation and we were running between 11,000 and 12,600 most of the day.
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  #55  
Old 08-03-2010, 10:36 AM
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Quote:
Originally Posted by TonkaToy View Post
Wow that camera does thake some nice pics. The colors are so vivid in them.
Yeah, I was going to ask about the settings on the camera to get so much color saturation. I might want to try that.
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  #56  
Old 08-03-2010, 11:51 AM
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Yeah, I was going to ask about the settings on the camera to get so much color saturation. I might want to try that.
Post-processing?
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  #57  
Old 08-03-2010, 12:15 PM
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Quote:
Originally Posted by Air Randy View Post
We were all pretty much using the same type of fuel, why then did many of the mechnically pumped, carbbed vehicles never skip a beat?
Makes you wonder though? Are all gases really the same, or might you get a better quality gas from somewhere like Conoco as opposed to the Loaf -n- Jug? Mike and I were chatting about the 10% ethanol thing in the back of the line (which I think is a good theory), but maybe some cheaper gas has a higher concentration than 10%?

Quote:
Originally Posted by Air Randy View Post
Several of the "vapor lock" issues I saw appeared to actually be engines loading up from being too rich. That could be due to a carb needing rebuilt, floats too high, sea level jets at high elevation, ignition timing not set for high elevation, etc. All of those things are amplified at elevation and we were running between 11,000 and 12,600 most of the day.
In the case of the two brothers in the blue FJ40 (sorry - I've already forgotten their names), they had ongoing problems with idling, but their truck did really well maintaining RPMs and climbing. But another data point is that these guys were on the same run a year ago and no issues at all. Only difference is that it was much colder last year (which may be all that truck needed?).
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  #58  
Old 08-03-2010, 12:26 PM
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Quote:
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Post-processing?
It could be, but it also might be a setting in the camera menu. Most cameras have these kind of settings. I'd love to hear from the photographer as to how he is achieving this level of color.
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  #59  
Old 08-03-2010, 01:10 PM
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So I have to ask....Would you all be willing to park in a row at the Rally this weekend???

These pictures are so cool, it would be awesome to reproduce a line up like this, so we could take more pics of these rigs...

Just a thought.
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  #60  
Old 08-03-2010, 01:20 PM
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Default Perry and I have an idea cookin'

Great minds think alike, Chris. Perry and I are cookin' up an idea along these lines. I'll be at a wedding on Saturday, or else I'd be there in my 40, too.
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