Adding castor to full synthetic fuel  
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> RC Fuels >> Adding castor to full synthetic fuel
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Adding castor to full synthetic fuel - 7/6/2008 12:50:05 PM   
OldScaleGuy



Posts: 772
Joined: 12/19/2005
From: Seymour, IN, USA
Status: offline 		Hey fella's. I have several gallons of Wildcat 2 & 4 cycle 15% fuel. It contains 18% total synthetic oil. I would like to add some castor to the blend. If I add 5 ounces of castor to a full gallon it will increase the oil content to 20%. What will the effect be or will it even be noticable in the way the motors run?

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RE: Adding castor to full synthetic fuel - 7/6/2008 2:07:19 PM   
adetoyinbo2


 

Posts: 23
Joined: 4/4/2005
From: upper marlboro, MD, USA
Status: offline 		hi

yes it will.also depend upon what you intend to use it for.if for brakingin an engine fine.


jimmy

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RE: Adding castor to full synthetic fuel - 7/6/2008 2:08:26 PM   
carrellh



Posts: 3529
Joined: 3/30/2003
From: Garland, TX, USA
Status: online 		Adding oil very slightly decreases your methanol and nitromethane percentages. So, you might get slightly less power than you'd get running the fuel with nothing added. Also, adding 5 ounces will give over 21% total oil.

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RE: Adding castor to full synthetic fuel - 7/6/2008 3:10:19 PM   
OldScaleGuy



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quote:

ORIGINAL: carrellh

Adding oil very slightly decreases your methanol and nitromethane percentages. So, you might get slightly less power than you'd get running the fuel with nothing added. Also, adding 5 ounces will give over 21% total oil.


So, based on what you are saying, it would be more appropriate to add 3.5 ounces. Right?
Nice chart by the way. Thank you.

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RE: Adding castor to full synthetic fuel - 7/6/2008 4:04:57 PM   
carrellh



Posts: 3529
Joined: 3/30/2003
From: Garland, TX, USA
Status: online 		If you want 20% oil, yes. I just bought 8 gallons of the same fuel and will be using it with nothing added.

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RE: Adding castor to full synthetic fuel - 7/6/2008 4:13:52 PM   
OldScaleGuy



Posts: 772
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From: Seymour, IN, USA
Status: offline 		It is not neccesarily the 20% factor that i am after, i just prefer to have a little castor mixed in. Old school maybe ...

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RE: Adding castor to full synthetic fuel - 7/7/2008 4:03:23 AM   
Flyboy Dave



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From: San Bernardino County, CA, USA
Status: offline 		....5 ozs. castor will be fine....no worries.

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RE: Adding castor to full synthetic fuel - 7/7/2008 6:47:18 AM   
downunder



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Joined: 10/10/2002
From: Adelaide, AUSTRALIA
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quote:

ORIGINAL: carrellh
Adding oil very slightly decreases your methanol and nitromethane percentages.

It doesn't really but it seems to because of the way percentages are worked out using the total mix of oil/methanol/nitro. If you look at that table where 5% oil gets added there's 67% methanol and 15% nitro so they're in a ratio of 4.47:1 (which is what the needle valve is tuned to) and after adding extra oil the table says there's 64.48% methanol and 14.44% nitro which is still a ratio of 4.47:1 and all that's needed is a slight "richening" of the needle to account for the extra volume of oil.

An easier way to think about it is if there was a 50/50 mix of methanol and nitro. No matter how much oil you add there's always still a 50/50 mix. Even easier is a fuel with no nitro. With any amount of oil you still tune just for the methanol going into the engine.

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