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If bashing around with 15% nitro fuel and 18% oil??

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If bashing around with 15% nitro fuel and 18% oil??

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Old 04-13-2018, 09:51 AM
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Default If bashing around with 15% nitro fuel and 18% oil??

When it comes to nitro rc world im a complete newb, my lhs has heli nitro fuel with 15% nitro and 18% oil (that has 20% castor and 80% synthetic).... this seems to me a great bashing high protection fuel, "seems" being the key word since im a newb.

But seems to take longer to clear out? Is that expected? The previous fuel i was using was byron race 2 with 20% nitro and 12% oil (not sure the oil mix) so obviously it had more punch and didnt seem to take much to clear out.
This experience is after retuning for the diff fuel. Both hsn and lsn had to be richened, if i lean the lsn any further i get a lean bog... although i rather have a lean bog then an added 5sec clearing out

Trying hotter plug didnt get me any benificial results, using OS 8. Have hobao #3 and odonnel 77 was afraid of advancing timming too much and detonation, so went back to OS08

Please advise!...
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Old 04-13-2018, 10:09 AM
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Too much oil for regular running. You will see hotter temps, harder needle setting, and overall sluggish performance. Stick with 10-12% oil - 15% Nitro is fine if thatís what you can get, but I like 20% as an all around good number for bashing. Castor/synthetic blend oil packages are usually the best bet for ABC engines.

20/12 fuel and a medium heat long reach plug is good. MC8s might be too hot for some
higher strung engines.
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Old 04-13-2018, 10:40 AM
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my recommendation is to run the nitro percentage that your engine manufacturer recommends and since you're bashing, go with a slightly higher oil content like 10-12%.
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Old 04-13-2018, 01:15 PM
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A bit more sluggish i can deal with, tougher needle settings is also okay... but is it normal to take longer to clearout?
Maybe a clearer question is, is it normal to take longer to clear out the older the motor gets? This is my 5th gallon, and the pinch is very faint if that has any indication of current compression. My idle has to be somewhat high
Manufacture recommend 20% nitro thats all they mention... nothing about oil...

Oh btw, i hope this doesnt turn yall furious, the 20/12 byron here sells for $60/ gallon, the VPracing 15/18 sells for $40

As far as costly goes i rather mix the two if i have to rather than go on paying $20 extra per gallon
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Old 04-13-2018, 01:32 PM
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Too much oil will cause your carb settings to not be right and it will have a hard time clearing out. The engine was designed for car fuels with 8-12% oil. The sluggishness and slow cleanout is because there’s so much more oil (that doesn’t burn) displacing what fuel component would be present to burn and actually make power. A lot of times, guys will run airplane fuel and end up running too lean because the fuel is so hard to get the engine to run smooth on. I guarantee if you ran both fuels side by side - tuning the carb each time, you would see a marked difference.
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Old 04-13-2018, 10:57 PM
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with the 20/12 my base tune is hsn 4 turns out lsn 1.5 turns out
with the 15/18 my base tune is hsn 4.5 turns out lsn 2 and 1/4 turns out

even though the rule of thumb ia less nitro leaner setting AND higher oil content leaner settings...

i had to go complete opposite..
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Old 04-13-2018, 11:52 PM
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why did you have to richen it up? if its not clearing out and sluggish you should have went the other way temps be damned
also if the motor has five gallons on it and wont idle without the idle being quite high it may be just about worn out
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Old 04-14-2018, 12:16 AM
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Oil is making the viscocity of the fuel, with more oil the fuel is thicker so it needs a more open needle to give a same fuel flow.
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Old 04-14-2018, 02:21 AM
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Exactly what Roelof said, and it will be very difficult to get the engine to clear good with that much oil.
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Old 04-14-2018, 02:45 AM
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Valid, logical, and great points !! Thanks, it all makes sense, gotta know when enough is too much.

Actually my very first gallon breaking in the motor was with this fuel, i just dont recall how long clearing out took, maybe i was just used to it and didnt notice till after using the 20/12 fuel. Or was too envolved with tuning so it was relativly much better running than with factory rich needle settings!

So either i have to live with excessive clearing out time or have to sweat out $20 extra for the 20/12 PER GALLON. Not a simple choice to make for bashing purposes... thats why i mentioned i rather mix both gallons, that way i get 17.5% nitro and 15%oil :-D that would cost me $100 for 2 gallons
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Old 04-14-2018, 09:19 AM
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Note that the very first take off is after sitting idling for 15 or 20 seconds!
Here is a running video showing my base tune of this fuel after about half a tank. Idle is fine , top speed is fine but the take off is "so-so"

https://youtu.be/7QGrNSbH5Ps

I think for saving $20 per gallon it aint bad , what yall think?
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Old 04-14-2018, 10:20 AM
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Well, that Was sluggish! What you can accept is up to you, but I would change.
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Old 04-14-2018, 10:30 AM
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Have you checked the prices to get a case (4 or 6 gallons) of fuel shipped to you? The VP fuel cases are 6 gallons and price per gallon is awesome.
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Old 04-14-2018, 10:58 AM
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I mean dont judge the very first take off, that was over 15sec idle probably 20, see the other take offs, i know it isnt comparable to using another fuel, i just wondering that all things concidered dont you think its fine?

My ONLY options in my country for fuels is :
byron or odonnel 20% nitro $60 ,
morgan cool power heli 30% nitro 23% synthetic oil $50,
vp racing 15% nitro 18% oil $40,
and chinese 16% nitro god knows what oil % hardly any smoke was being released and the entire combustion chamber turned black, so for $25 i chose not to use it anymore

This is prices per GALLON, so i repeat all things concidered, what yall think?
Im sure probably some.of you will wonder why not lose the nitro and switch electric. Well iv got electric and im enjoying the change. For the time being.
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Old 04-14-2018, 12:06 PM
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I didn't mean the first takeoff, it seems to be held back. How it compares to another fuel, I have no idea as I have nothing to compare it to.
In the end it's kind of like asking if a rose is red enough, it's kind of up to the beholder... If you're happy, run with it!
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