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Old 05-03-2009, 07:32 PM   #1
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Default 16% for .21 engines?

hi,
seems like nobody uses 16%nitro for their .21 engines? any reasons?
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Old 05-03-2009, 08:04 PM   #2
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hi,
seems like nobody uses 16%nitro for their .21 engines? any reasons?
Less power. The only time I see people in the USA running that low of a nitro content is to improve runtime.
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Old 05-03-2009, 08:08 PM   #3
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16% is great if you need more runtime. You may not see the average dude using it since it's easier to make runtime when you're 1-2 laps off the pace but many pros use it on runtime sensitive tracks.
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Old 05-03-2009, 08:51 PM   #4
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if engine is shimmed for 25%, to use 16% i just need to remove 0.1mm shim right?

wouldn't that compensate for the power loss and thus actually be similar to 25% power?
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Old 05-04-2009, 08:10 AM   #5
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if engine is shimmed for 25%, to use 16% i just need to remove 0.1mm shim right?

wouldn't that compensate for the power loss and thus actually be similar to 25% power?
But it would run hotter with %16...
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Old 05-04-2009, 07:45 PM   #6
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It will run hotter. Also if shimmed correctly it will still be fast, just a little less torque. I recommend using a hotter than normal plug if you do this.

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Old 05-04-2009, 09:38 PM   #7
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We used 16% with the JP Black Mod Eagle 9S at 301 Raceway and it worked great. Vincent Jackson TQ'd using that combo. We left the head clearance the same/normal so that we could run a little leaner without detonation. Performance was great and fuel consumption increased +1 lap from 20% and +2 laps from 25%. IMO it's the best way to improve runtime with the super hot mod motors.
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Old 05-05-2009, 03:44 AM   #8
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But it would run hotter with %16...
running 16% on .12 engines also likewise hotter?
generally hotter by how much?
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Old 05-05-2009, 05:22 AM   #9
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I think it depends but it can be around 20celcius...
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Old 05-05-2009, 06:33 AM   #10
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I think it depends but it can be around 20celcius...
20 celcious if you go from 25% to 16%?
naaaa i don't think so!
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Old 05-06-2009, 01:45 AM   #11
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20degC hotter if from 25% to 16% is alot!
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Old 05-06-2009, 07:30 AM   #12
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Quote:
Originally Posted by dj apolaro View Post
It will run hotter. Also if shimmed correctly it will still be fast, just a little less torque. I recommend using a hotter than normal plug if you do this.

DJ Apolaro
I currently run a cold plug with 25%. I'm switching to 16%. Should I move to medium plug? This will be for Novarossi .12 3sct
And I should expect my engine to run a little warmer when running 16% vice 25%?
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Old 05-06-2009, 10:33 AM   #13
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ok ok I admit that I exaggerated
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Old 05-09-2009, 01:42 AM   #14
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Originally Posted by keavze View Post
20degC hotter if from 25% to 16% is alot!
for my case, when i use 16% on my engine that is tuned for 25% and shim for 25%, the temp goes lower and i need to lean the high end to get the power. the temp diff range is like 10-15 degree c! this is for my .21 off road engine!
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Old 05-09-2009, 04:27 AM   #15
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Quote:
Originally Posted by lil-bump View Post
I currently run a cold plug with 25%. I'm switching to 16%. Should I move to medium plug? This will be for Novarossi .12 3sct
And I should expect my engine to run a little warmer when running 16% vice 25%?
well if you shim the engine on 16% then yes it should run hotter than with the 25%...
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