Fine tune your engine according to weather and nitro changes
Here is a guide to fine tune your engine according to weather and nitro changes
http://www.myrcbox.com/?p=3899 |
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Thank You.
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Hmmm... If I go to a higher oil content the fuel will be thicker so I have to richen the main needle.....
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Originally Posted by Roelof
(Post 7614178)
Hmmm... If I go to a higher oil content the fuel will be thicker so I have to richen the main needle.....
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Originally Posted by Roelof
(Post 7614178)
Hmmm... If I go to a higher oil content the fuel will be thicker so I have to richen the main needle.....
30% nitro + 10% oil + 60% alcohol = 100% 30% nitro + 12% oil + 58% alcohol = 100% in the above example the 12% oil mixture would have approx. 3% less alcohol. Your engine would run leaner. (because of the reduction in alcohol) |
Nitro and methanol are like water, they have a very low viscocity. Oil has compared with nitro and methanol a very high viscocity and is determing the viscocity of the fuel.
Going from 10% to 12% oil contant is a change of 20%, going down from 60% to 58% is just a 3% change. Believe me, more oil content (taken from the same brand/type fuel) will raise the viscocity and a richer setting is needed to get the same strengt of flow with the fuel. Beside that, tuning an engine must always be done on a feeling regarding the temperature, smoke, sound and visable performance. For starters it is wrong to show such a list, they just do what the list says but can not messure/feel all factors shown in the list so they can go to lean.... |
Originally Posted by motomatt
(Post 7614913)
It isn't really because your fuel is thicker................it's because if you increase the percentage of oil content, you must reduce the percentage of something else in your "fuel". Alcohol is the actual fuel in your "fuel".
30% nitro + 10% oil + 60% alcohol = 100% 30% nitro + 12% oil + 58% alcohol = 100% in the above example the 12% oil mixture would have approx. 3% less alcohol. Your engine would run leaner. (because of the reduction in alcohol)
Originally Posted by Roelof
(Post 7615313)
Nitro and methanol are like water, they have a very low viscocity. Oil has compared with nitro and methanol a very high viscocity and is determing the viscocity of the fuel.
Going from 10% to 12% oil contant is a change of 20%, going down from 60% to 58% is just a 3% change. Believe me, more oil content (taken from the same brand/type fuel) will raise the viscocity and a richer setting is needed to get the same strengt of flow with the fuel. Beside that, tuning an engine must always be done on a feeling regarding the temperature, smoke, sound and visable performance. For starters it is wrong to show such a list, they just do what the list says but can not messure/feel all factors shown in the list so they can go to lean.... 1. because there's less fuel % you need to richen it up to get the same fuel/air mixture 2. because the fuel is thicker its harder to pump the fuel through the motor. |
Originally Posted by Roelof
(Post 7615313)
Going from 10% to 12% oil contant is a change of 20%, going down from 60% to 58% is just a 3% change.
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Originally Posted by razo125
(Post 7615667)
I was following you until this point. Isn't going from a 10% to 12% oil a 2% change?
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just turn the needles until it runs good and temps are reasonable......... eeeeeeeeeeeeasyyyyyyyyyyyy :nod::nod::nod::smile::smile::smile:
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bookmarked
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I have contacted few engines gurus and manufacturers and they have told me that when we use higher oil percentage, we should RICHEN UP the settings a little bit. I have corrected the post.
Sorry for the inconvenience it may have caused :) |
Originally Posted by Sylvain
(Post 7616118)
I have contacted few engines gurus and manufacturers and they have told me that when we use higher oil percentage, we should RICHEN UP the settings a little bit. I have corrected the post.
Sorry for the inconvenience it may have caused :) Regards, Ron |
Originally Posted by Werks
(Post 7616953)
Yep, that is correct. The issue is the higher oil content reduces the amount of methanol in the fuel. Methanol vaporizes in the combustion chamber at a relatively low temperature and when it does so it has a heat wicking effect which cools the combustion chamber. This means that the operating temperature of the engine is reduced so you can lean the engine out for additional power/run time. An additional benefit of the increase in methanol content (in addition to the reduction in combustion chamber temperature mentioned above) that is not often talked about is that methanol has a really high effective octane rating or anti knock index give you the ability to safely run a lower deck height hence increasing your engines compression ratio with less likelyhood of pre-detonation.
Regards, Ron Thanks for the explanations... :) |
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