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Originally Posted by suspectnumber961
In this general area about all gas comes from the same refinery...except for the additives that might be different? I have tested gas for ethanol content by adding some water and shaking a graduated cylinder to get it "dissolved" into the water....works...crudely. Can't find non-ethanol laced gas near here though.
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Since I have the means to measure gasoline characteristics, I've given up on discussions of gasoline sources other than the specific station and pump. I always use the Shell station, 11900 Memorial Parkway, Huntsville, AL. During my hill-climb studies, I used different brand name stations but always the same station since the local tanks would have unique batch history ... the combination of fills. Beyond that, speculation is not as useful as metrics. <grins>
A couple of years ago, I bought a hydrometer and graduated cylinder to measure gasoline density but I could not find a correlation with energy content from the hill-climb data. The hill-climb data was repeatable over different samples from different stations.
Quote:
Originally Posted by suspectnumber961
Rereading the instructions...I guess they do say that a max of 1K miles is needed to bond the boron...though it sort of goes against the grain to change it again after 1K miles. But if it does loosen up some gunk...probably a good idea to get it out.
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That is what attracted me to this particular additive, the chemical bonding to the metal surface. This also explains why more of the varnish and gunk would go into suspension. We're doin' chemistry in the engine.
In contrast, the other additives require either pre-treatment before assembly, use during assembly or some non-trivial percentage within the oil. Change the oil and the additive is diluted to non-existence. Each change requires more additive.
Quote:
Originally Posted by suspectnumber961
With that sort of accurate and detailed testing...I think you should test some fuel additives? I had good luck recently using Techron....but only saw an mpg gain using about 1/2 to 1/4 the concentration they call for...after using the higher concentration though. Would be interesting to see if Techron or other additives are adding "energy content". Hard to distinguish between "increased energy content" and "increased lubricity" and "decreased gunk drag" (new term  ) in some cases?
Gasohol vs straight gasoline...regular vs premuim?
Or better yet...the MS fuel system additive. Easy for me to say....  |
In testing, we like to hold as many variables constant and have only one change. That is why finding the 'notch and plateau' when the thermostat opens has been such a lucky find.
BTW, I did a Shell ethanol test against straight gas last year, Pure, both 93 and 87 octane, and the Shell 87 came out better. This is not surprising as two years ago, Shell, Chevron and Exxon 87 tested better than Citgo, Texaco and BP and Shell and Texaco. I also tested 91/93 octane and found a measurable effect at high power settings, as would be expected. But the increase in spark advance did not equal what the higher energy, 87 octane gas was doing.
Bob Wilson