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Old 08-08-2005, 04:26 PM   #1
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Default What % nitro for STS .28 engine?

I am upgrading my savy engine for an STS .28. What % nitro would be best to use? I currently use 20% on my star s-25. Should I stick to the same for the STS or Should I go higher?
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Old 08-09-2005, 10:35 AM   #2
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20% is okay. wanna more low end torque then choice more nitro.
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Old 08-09-2005, 12:26 PM   #3
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I run 20% and could not be happier. Watch out the .28 has crazy power.
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Old 08-09-2005, 02:12 PM   #4
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If I go up to 25% would the extra nitro just be compensating for the extra room for combustion, being a slightly bigger engine, or would it actually give it extra power? If any of that makes sense!....lol
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Old 08-09-2005, 11:40 PM   #5
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Quote:
Originally Posted by silacomalley
If I go up to 25% would the extra nitro just be compensating for the extra room for combustion, being a slightly bigger engine, or would it actually give it extra power? If any of that makes sense!....lol
How many % nitro...it is just like how many compression bar to a turbo engine. There are two main fuels of your engine. One is methyl alcohol another is "AIR". Higher nitro % = more air
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Old 08-20-2005, 12:15 AM   #6
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Default 30%

I am using RACE 30%.
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Old 08-20-2005, 11:57 AM   #7
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Quote:
I am using RACE 30%.
And it runs ok with 30%, right? What temp plug do you use & have you modified the engine? Or does it run just fine with no modification with 30%?
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Old 08-20-2005, 12:56 PM   #8
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So far so good. I am still breaking it in. An excerpt from the manual indicates they have planned on people using %30

FUEL
Total thickness of head shim
Under 20% Nitro
0.3 mm
25% Nitro
0.4 mm (0.1 mm)
30% Nitro
0.5 mm (0.1 mm)

It appears that it is okay to run the 30%

EDIT I am using an OS 8.. but don't follow my example. This is only my 2nd engine and my first engine, the k 4.6 lost mad power on the start of the 3rd gallon.
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