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02-10-2008 02:42 PM  10 years agoPost 21
Jeff polisena

rrElite Veteran

westpalmbeachflorida usa

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Most of motors come with better metals than past so you dont need break in I just like to get a lot of oil to moving parts before I lean out one I start to lean out I stop where power is good and consistent with low temps I do this and I get long life out of motor I need to only to change bearings in motor and I do fly hard 3D this is my set up OS hyper 50,MP5,TJ PRO rev max,GY 611,4 8717's(crack)with power master 30% at 1900 & 2000 head speed with V blade TST ,G Force head no worries and no in flight failures

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02-10-2008 04:33 PM  10 years agoPost 22
avatar71

rrApprentice

East Amherst, NY

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Break it in on whatever fuel you plan on running in it.
why?

Sharkbait! hoo ha ha

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02-10-2008 04:47 PM  10 years agoPost 23
Jeff polisena

rrElite Veteran

westpalmbeachflorida usa

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This used to be a norm but I think it is a myth Ive changed fuels from one tank to the next and had no issues just had to re tune

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02-10-2008 04:57 PM  10 years agoPost 24
DS 8717

rrProfessor

Here wishing i was somewhere else

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It doesn't really matter if you change nitro content with ringed engines,it does matter with nonringed engines because more nitro will cause higher temperatures and more expansion of the sleeve which will mean a looser fit. If you use lower nitro to break in the engine the linner wont expand enough and cause the piston to wear more, then switching to higher nitro will cause the engine to have less compression.

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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02-10-2008 04:59 PM  10 years agoPost 25
Jeff polisena

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westpalmbeachflorida usa

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10X Ive not seen you here that often as in past wuzup

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02-10-2008 05:14 PM  10 years agoPost 26
airdodger

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Johnston USA

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Jeff What about the short window it takes to seat the ring , you don't care or don't believe it?

Chris

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02-10-2008 05:16 PM  10 years agoPost 27
BarracudaHockey

rrMaster

Jacksonville FL

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Break it in on whatever fuel you plan on running in it.
why?
I suppose that could be taken two ways. There's no problem changing fuels, what I mean was that you dont need a special break in fuel, I've heard people talking about breaking in on low nitro and switching to high nitro thinking they are helping things out, you can break it in on whatever fuel you are planning on flying it.

The ring and the liner need to seat. The newer engines have much closer tollerences and certainly don't need a prolonged break in but I really dont believe running blubbering rich does anything but waste fuel.

Andy
AMA 77227
http://www.jaxrc.com

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02-10-2008 05:24 PM  10 years agoPost 28
avatar71

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East Amherst, NY

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correct me if I'm wrong but engine break in is essentially controlled by temp, pressure and lubrication.

Cannot an engine be overheated using 15% nitro? of course it can.

I have always been leary of comments regarding engine conditioning. Even with car engines. I remember being told that once you go to synthetic oil, you cannot go back to dino oil... I believe that to be BS! How does and engine "know" if the oil is different. Does the synth oil cause a chemical or physical reaction to the pistons...???

I believe break in to be simple, get the temp just right for a few tanks and then go fly.

UNLESS, there is some real physical or chemical justification.

Sharkbait! hoo ha ha

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02-10-2008 05:30 PM  10 years agoPost 29
Jeff polisena

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westpalmbeachflorida usa

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Its not that I dont care or believe Ive broke in many different ways and really seen no problems with the way I do it I do understand two types of metals heating to a same temp
but like I posted earlier I get a long life out of motors this way I also don't start motor on first flight of day and go into a full on high rpm 3D flight I usually do hover and orientation training to get juices flowing then I hit it hard When you break in an airplane motor you run at full throttle so rich that it is "four stroken"then you start leaning to get power every tank there after so ther are many different ways to break in ringed or non ringed motors
Also I picked this routine up from my rc car days and it stuck with me

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02-10-2008 11:09 PM  10 years agoPost 30
tommytt1

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Mercerville, NJ, USA

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Thanks for the all the great info and opinions,I enjoy reading it. Thats why I started this thread. Tom

I made a mistake once, but I was wrong?

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02-11-2008 01:51 PM  10 years agoPost 31
jadams

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East coast USA

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It would be nice to have a race car engine builder explain how and why you break in an engine....bottom line is if you don't heat and load the engine you will never seat the ring.

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02-11-2008 03:25 PM  10 years agoPost 32
BarracudaHockey

rrMaster

Jacksonville FL

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When you break in an airplane motor you run at full throttle so rich that it is "four stroken"
Thats just plankers wasting fuel and making a racket in the pits.

Lets ask the experts...

From the hyper manual
All internal combustion engine benefit, to some degree, from extra care whey they are run for the first few times-known as running-in or breaking-in.
This allows the working parts to mate together under load at operating temperature.
However, because O.S. engines are made with the aid of the finest modern precision machinely and from the best and most suitabler materrials, only a very short and simple running-in procedure is required and can be carried out with the engine installled in the modle. For the first few flights with a new engine i.e. while the engine is being run-in set the needle-valve for a slightly rich mixture not excessively rich as this may result in poor throttle response and cause the engine to stope. About 1.5 turn open from the normal setting will normally siffice.
Word for word, poor grammar and spelling included.

Just for fun I reviewed a few different plank engine manuals for 2 and 4 strokes and they advocate heat cycleing for a tank or two between full power and breaking between 2 and 4 stroke with the throttle at WOT and using the needle valve to adjust the speed.

Andy
AMA 77227
http://www.jaxrc.com

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02-11-2008 03:44 PM  10 years agoPost 33
Pinecone

rrKey Veteran

Maryalnd

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I race cars.

Current race car break in, easy warm up and let cool down. Warm up then do runs using full throttle (need to get cylinder pressures up) starting with a mid range red line, and moving the red line up over time until you are full normal red line. Go race.

Rings don't seat without cylinder pressure. The cylinder pressure leaks down behind the ring and actually pushes it out to seat it.

And actually for a lot of engine builds these days, they pre break in the engine. You will love this one. They run it without oil. Yeap, they oil the bearings as they assemble it, then fire it up without oil and the rings seat just about instantly. BMW does this with their car engines. The break in period is for the tranny and diff more than the engine.

Terry
Blade CP Trex 450 SE
QJ EP8v2 EX Gaui Hurricane 550
Vibe 50 Bergen Intrepid Gasser

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02-11-2008 04:28 PM  10 years agoPost 34
airdodger

rrElite Veteran

Johnston USA

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http://www.mototuneusa.com/break_in_secrets.htm You can also go to Total Seal rings and see what they say about rings, the importance of the correct honing and seating the ring.

Chris

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02-11-2008 04:34 PM  10 years agoPost 35
Jay1

rrVeteran

Colorado Springs

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Nice info on the whole race car and BMW engine break in procedures. Now does the translate over to our little nitro engines? I wonder if the piston ring and liner is of the same material as the race cars or BMW's metal composition?

Jay
Sooner or later, Gravity will win!

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02-11-2008 04:45 PM  10 years agoPost 36
Raffy

rrElite Veteran

Chicago, Illinois

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This is not about engine break in! It's all about someone's ego break in procedure!

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02-11-2008 04:49 PM  10 years agoPost 37
airdodger

rrElite Veteran

Johnston USA

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The materials are probably different given the amount of 100's of millons of dollars they spend. The techniques remain the same for ringed internal combustion engines as do the working principals and the laws of physics they use.

Chris

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07-27-2008 08:32 AM  10 years agoPost 38
Pinecone

rrKey Veteran

Maryalnd

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Car engines are aluminum (sometimes with a high silicon alloy to provide lower wear) or cast iron cylinder, with steel or cast iron rings, that MAY be chrome plated or have a moly filled groove in them.

Pretty much similar to many model aircraft engines.

Terry
Blade CP Trex 450 SE
QJ EP8v2 EX Gaui Hurricane 550
Vibe 50 Bergen Intrepid Gasser

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