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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> RC Fuels >> Commercial Fuel Mixtures
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Commercial Fuel Mixtures - 4/21/2004 7:33:52 PM   
Thumper1


 

Posts: 79
Joined: 5/20/2002
From: Moxee, WA, USA
Status: offline 		Do commercial fuel manufacturers mix fuel by volume, or weight? I was told that most of them mix by weight no matter what they tell you. When you buy a gallon on 10% Nitro fuel, what you are really getting is something closer to 7%. Has anyone done any research on this? I sent an Email to Powermaster, so far, no response.
       Post #: 1

RE: Commercial Fuel Mixtures - 4/23/2004 7:13:04 AM   
downunder



Posts: 3116
Joined: 10/10/2002
From: Adelaide, AUSTRALIA
Status: offline 		Some, well one at least, mixes by weight but the important thing isn't that you're getting shortchanged on nitro but you're getting shortchanged on the oil content. Oil is roughly the same density as water (1) while methanol is about .8 so if a manufacturer mixes by weight and tells you it's got 17% oil then actually it's nearer 14%, that's BAD!

Some guys have run tests on fuels by either burning off or evaporating out the methanol/nitro and checking to see how much oil remains. One brand sold as 17% oil has only 14% (I can't remember the exact brand but it sounds something like Cruel Power ). There's a current thread on this exact same thing at http://www.clstunt.com/htdocs/dcforum/DCForumID1/8863.html

(in reply to Thumper1)
       Post #: 2

RE: Commercial Fuel Mixtures - 4/23/2004 12:45:34 PM   
Sport_Pilot



Posts: 7451
Joined: 1/21/2002
From: Acworth, GA, USA
Status: online 		You are getting shortchanged on nitro more than oil. Nitro is heavier than water!

(in reply to downunder)
       Post #: 3

RE: Commercial Fuel Mixtures - 4/24/2004 3:42:12 AM   
downunder



Posts: 3116
Joined: 10/10/2002
From: Adelaide, AUSTRALIA
Status: offline 		Sport_Pilot....granted, but try this test. Run an engine with zero nitro then run an engine with zero oil. Which ingredient is more important?

(in reply to Sport_Pilot)
       Post #: 4

RE: Commercial Fuel Mixtures - 4/25/2004 5:36:32 PM   
POWERMASTER


 

Posts: 46
Joined: 10/27/2002
From: Elgin, TX, USA
Status: offline 		Thumper1,
Can't speak for other manfacturers but Powermaster uses volumn measurment
in our fuel mixes.
Powermaster

quote:

ORIGINAL: Thumper1

Do commercial fuel manufacturers mix fuel by volume, or weight? I was told that most of them mix by weight no matter what they tell you. When you buy a gallon on 10% Nitro fuel, what you are really getting is something closer to 7%. Has anyone done any research on this? I sent an Email to Powermaster, so far, no response.

(in reply to Thumper1)
       Post #: 5

RE: Commercial Fuel Mixtures - 4/25/2004 9:18:01 PM   
Homebrewer



Posts: 1335
Joined: 12/29/2001
From: Colorado Springs, CO, USA
Status: offline 		Morgan Fuels: Volume
Wildcat: Volume
Powermaster: Volume
Sig: Volume

BYRONS: WEIGHT

(in reply to POWERMASTER)
       Post #: 6

RE: Commercial Fuel Mixtures - 4/26/2004 12:35:24 AM   
hauckf


 

Posts: 187
Joined: 3/1/2002
From: Decatur, AL, USA
Status: offline 		What Homebrewer said, plus Cooper's, S&W, and Red Max are by volume as well.

(in reply to Homebrewer)
       Post #: 7

RE: Commercial Fuel Mixtures - 4/26/2004 7:18:52 PM   
Thumper1


 

Posts: 79
Joined: 5/20/2002
From: Moxee, WA, USA
Status: offline 		I knew a guy who worked for one of the major fuel component manufacturers. He told me that there are a number of manufacturers who CLAIM that they mix by volume, but in fact, they mix by WEIGHT. (This was a few years ago) He said to put a known quantity of fuel in a shallow glass pan and let it evaporate in a well ventilated area for a few days. While this process will not tell the percentage of Nitro, it will tell you how much oil is in the fuel. For a time, I was mixing my own fuel. I used 10% Nitro, 16% Synthetic and 2% Castor oil with the balance Drag Racing grade VP Methanol. Compared to the Byron fuel I was using, I was getting a LOT more RPM, and a lot more smoke. My LHS changed ownership. The new guy dropped fuel prices along with everything else and I decided to support him. Fuel expenses is just another cost of the hobby. When you are paying for one thing, and getting something else, that's a problem.

(in reply to Thumper1)
       Post #: 8

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