Technical > Spud Miller's Cave

measuring nitro percentage

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wideopen231:
 First hundered percent agree hydrometer best way to measure nitro. I kind of stumbled onto another hydrometer that seems to give same answer w/o much work. I have a proofing hydrometer for  liquor  and seems a 30% load reads 70% or 140 proof alcohol. I tried it on cpl different mixtures and it read same all 3 times. Now how mcu effect a big temp swing would have I do not know,maybe Spud will chime in on this.

Not to insult anyone. the 30% NITRO WOULD LEAVE 70% methanol. I tested 25% and 15% loads.

msundstrom:
Are they percentages verified by a hydrometer? Is there something to compensate for temperature on the proofing hydrometer?

dusterdave173:
Spud at FIE has a great kit to do this with--it comes with all important temp chart--15% at 68 is not 15% at 85 degrees
If you consider that you are mixing bomb making materials in the pits with the public standing right there then you need to be very careful about what you are doing--
It is especially important to Know what you are doing when starting the engine --one wrong move then all the "I am sorry" in the world will not fix a problem
We started and warmed on alky in pits--drained tank added nitro mixture--then when we started in staging we were starting on alky in the pump and lines--Much safer than firing up with nitro in there IMO
When I was a kid I got hit by a piece of exploding engine in just such a pit accident--made an impression

You have to be educated and Know what you are doing or you could kill someone

It was fun to fire up idle and then wait for the nitro to enter the stream--wow! If you have never run nitro do it while you can--the memory will last forever!! It is Real drag racing but remember it is pretty easy to hurt  yourself or others with it

sknopp:
Hey Chris, like Dave said go to Spud's FIE website.  In the "nitro notes" section he has charts that show percentages for a given specific gravity at a specified temperature.  Steve K. 

wideopen231:
I have full set of hydrometers for nitro and one for alky. That is how I know they read same.The nitro set I have electric thermometer also. After reading hydrometer,reading temp and going to chart I found out it was 40$ the proofing hydrometer read 70& alcohol, meaning 30% nitro. I did this with three different mixtures and all checked the same.   Never said it was 100% replacement. It is a quick check

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