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Old 05-07-2009, 07:21 AM   #1
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Default Nitro percentage in 16% fuel

Hi,
Just to share my findings.
I had been using a well respected brand of 16% nitro fuel. I measured it with Serpent Nitromax and in order to make it almost 16%, I had to add 100ml approximately of 99.9% pure Nitro. After adding 100ml of nitro the nitromax was falling extremely slow, meaning that the fuel was almost 16%.
Let's see some quick calculations and we get that 100ml in 2500ml is approx. 4%, meaning that the original fuel is approx. 12%, instead of 16% as it should.
Recently, I tested another well respected 16% fuel and in order to make the nitromax fall very very slowly, it took 190ml of pure nitro. With quick calculations we have that 190 in 2500ml is 7.6%, meaning that the original fuel is 8.4% instead of 16%.
All the measurements were taken in room temperature about 20 Celsius.
What is going on? Am I doing something wrong or the fuel is not really 16%?
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Old 05-07-2009, 07:40 AM   #2
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to be fair, did you try calibrating the nitromax by using your own mix of methanol and nitro?

i don't know for certain, but there might be some tolerance in the racing org's spec for 16% like 0.5 or 1.% margin? don't know but a calibration would tell you what you are measuring
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Old 05-07-2009, 08:41 AM   #3
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The fuel should have 16% nitro but other type of oils and less oil can make the fuel lighter. The nitromax is only a weightscale and not realy messuring the nitro content.

Yes, with less oil you can use more nitro to get the same weight.

Be carefull, the correct messure is at 20 degrees celcius, when it is colder your fuel could be heavyer and there are huge differences between the nitromax tools so do not find the limit with your own tool.
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Old 05-07-2009, 11:08 AM   #4
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If you want to be more accurate, you need something like this:

http://www.worldwideracingfuels.com/...categoryID=132
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Old 05-07-2009, 02:45 PM   #5
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This is the one to have:

http://www.sbsbattery.com/subpage_index.php?_subp_=91

Easy to setup and easy to use.
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Old 05-08-2009, 05:22 AM   #6
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Quote:
Originally Posted by Roelof View Post
This is the one to have:

http://www.sbsbattery.com/subpage_index.php?_subp_=91

Easy to setup and easy to use.
Still it will only give the SG of the blend. Not the nitro percentage. More elaborate tools are required for that....

Unfortunately there is no quick and simple way to check nitro percentage in a blend of substances. This will always lead to the possbility of adding nitro until you reach the max SG specified by ROAR/IFMAR end EFRA. Although they do specify a maximum nitro percentage by volume which makes all those that add nitro and go beyond the 16% by volume, cheaters.

But when the measurement doesn't say you cheat you don't....?
Only controlled fuels take this problem out of the equasion. It can add a lot of others though
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Old 05-08-2009, 07:08 AM   #7
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Quote:
Originally Posted by Julius View Post
Still it will only give the SG of the blend. Not the nitro percentage. More elaborate tools are required for that....
True!
But this device is quick and has temperature compensation so it takes away all the disadvantages of the Nitromax.

Real machines to filter out the nitro content are much more expensive, not portable and indeed it takes a lot of time to get a result.
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