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Switching between different nitro%??

BladeRunner

Elite Veteran

Ontario Canada. Member of "some sort" s

I'm confused! OK, maybe that's another topic, but I thought that if you run in an engine on-lets say 15% nitro, and used that for a while then you could go to a higher %. After a conversation with a couple of gentelmen at a recent fun-fly I was told the opposite is true . My logic is that I would learn on lower % nitro( to keep costs down) and then when I move forward and need more power I would go with the higher nitro. Could someone clear this up for me please? Thanks---BladeRunner.

10-25-2001 Over year old.
volkul

Elite Veteran

Phoenix, AZ

The way I understand it...

The way I understand it is this. If you break the engine in on 15% Nitro it caused the piston and cylinder to wear a particular way because of the internal pressure on it. Now if you switch to 30% you change the pressures inside the combustion chamber and she doesn't respond as well as if you had broke it in with 30%.

Now, some people have luck some don't. I have been able to switch to 30% without much trouble and my machines responded well. I have been told that if I had broke my engines in with 30 from the start that they would most likly generate more power than one that switched from 15%. Me... I can't tell the difference between an engine broke in on 30 or 15 if they are both running 30. But I can tell you I had tons more power with 30% than I ever had with 15%. To bad 30% cost me $15 more a gallon than 15% BTW, 1 Gallon of 15% costs me $22.50 here in Germany.

Lastly, if you want to make the move to 30% but don't want to buy a new engine you could always just replace the piston and cylinder and go for it. Then save the piston and cylinder you broke in on 15% in case you ever switch back.

Ken B

10-25-2001 Over year old.
HOMEPAGE  
BladeRunner

Elite Veteran

Ontario Canada. Member of "some sort" s

Switching Nitro?

Thanks Ken, it sounds like your fuel costs about the same as here, 15% is about $23 and 30% is a whopping $45-$46. That is the reason I want to find out the difference in running either one.-------BladeRunner

10-25-2001 Over year old.
Rotorhead

Senior Heliman

Spokane, WA

I thought it was the other way!

I asked this question on RCO months ago. The response was that breaking in an engine on 30% would cause it to have less power when going back to lower nitro content. Thermal coefficients and other technobabble insued. The consensus was increasing nitro content was OK, but power potential will be reduced when moving back from a higher content than the engine was broken in with. I'm sure someone can/will enlighten us further.

10-25-2001 Over year old.
BladeRunner

Elite Veteran

Ontario Canada. Member of "some sort" s

Switching nitro?

YIKES!! ------BladeRunner

10-25-2001 Over year old.
volkul

Elite Veteran

Phoenix, AZ

OK, now I'm not sure...

I might have gotten things backwards... Unfortunatly I am NOT the expert here. I was just repeating information I had read elsewhere and a personeal experence when I made the switch.

The fact is this. Going up in Nitro isn't going to kill you or your engine. It will take some retuning of the Carb (richining) But that's about it. The school of thought is that the engine may not preform as optimally as if it had been using the High nitro to start with.

Ken B

10-26-2001 Over year old.
HOMEPAGE  
ed vega

Key Veteran

nyc, queens

when learning to hover or fly you do want to keeps costs down .. so lower nitro's will be right .. I wouldn't suggest to mix 15% and 30% with the same engine . if you do go with 30% nitro with the same engine,
then clean it out get newer rings, bearings, or sleeve upgrades to start with .. but if your just learning then why spend $20+ bucks on %30 .. it will take gallons each week to learn ..

in my case I learned on K&B %15 nitro and was using OS engines .. when I switched to YS engines I started using 30% coolpower and it was the optimum fuel for these engines . althought friends have used lower nitros with YS motors..

so what I hear is several things .. learning to fly at lower costs, switching to higher nitros .. and what fuel does my engine perform with best , whats best for the skill level you are currently at .. everyone wants a setup like the pros right ..

10-28-2001 Over year old.
MaxHeadSpeed - -

It does not matter if you go up or down in nitro content - you will lose perfomance if you change anything about the fuel. Change brands, type of oil, amount of oil, amount of nitro, anything, and the engine will not perform as well as if it had been weened on it. Performance changes will vary depending on what was changed. Changing the nitro content is probably the least intrusive change one can make in the fuel. Changing the type of oil (castor vs. synthetic) is the worst change one can make, it can make an engine very obstinate!

Steve

10-29-2001 Over year old.
  WV  EDIT
vetrider

Elite Veteran

Daleville, AL (Ft.Rucker)

In RC Cars, lots of people change there fuel and/or nitro contents sometimes 3 or more times a year. The only thing recomended is to DO another (but shorter) break-in period and HEAT cycle the engine with richer setting as if it was a New engine. About 3 to 5 tanks of fuel should do it (in cars 125cc ea.). I've done this with 2 of my engines (a OS .12 and a OFNA .21) and they run great. Nitro car engines run much higher RPMs to produce their power......29,000+ so, our heli engines should not suffer too much if at all.
HOWEVER, the one thing that is questionable is oil blends, castor vers synthetic. If you change type Oil content, then the engine should be torn down completly and cleaned with an engine cleaner (Nitro wash, etc...) and lubed with some after run oil. Kinda makes you wonder tho........IS after run oil Synthetic or regular petrolieum blend???

HECK!!! just don't run it LEAN and it will survive. Hows that!!

Just My Honest Opinion

Nolan

10-29-2001 Over year old.
BladeRunner

Elite Veteran

Ontario Canada. Member of "some sort" s

Switching Nitro % ??

Thanks vetrider, I just picked up a case of Wildcat Helimix 15%. I'm just going to run it. Down the road somewhere when my skill levels go way up?? then I'll figure out if it's worth going with the 30%. Thanks to everyone who replied, this seems to be one of those "Ford vs Chev" questions. ........BladeRunner.

11-04-2001 Over year old.
Dave_D

Key Veteran

Philippines

In my case, my OS61 was broken in on 30% and I can switch back to 15% with little fuss. I do however feel the engine bogging down during high cyclic maneuvers using lower nitro, but I think that's normal for most engines anyway. Now that I've stocked up on 30% fuel again, I just run the engine a little richer than I would at 15% since the higher nitro makes needles a little more forgiving and give the engine longer life with the extra oil for lubrication and nitro to keep the engine running cooler.

My OS32 (ABC) was broken in using semi-synthetic fuel and it too handles any change in fuel I throw at it. As long as I take the time to re adjust your needles, I don't think the average Joe can tell the difference between engines broken in with what fuel.

11-06-2001 Over year old.
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Switching between different nitro%??

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