First-timer question on my experiences breaking in engine
09-25-2006 | 06:20 PM
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From: , MD
First-timer question on my experiences breaking in engine
I have tried several times unsuccessfully to break in my engine. I think the model is something similar to TTR40 Thunder Tiger 40 RC Engine...
Basically, what happens is that even though I follow the instructions, the engine always seems to instantly rev up so high that it sounds like it is going to explode. I always end up getting scared and turn it off prematurely. I obviously don't have much experience with R/C stuff, but I have seen others flying their airplanes so I think I know when an engine sounds liek it is revving at normal levels versus when it is too high. Anyone have any idea what I'm talking about?
Thanks in advance!
Basically, what happens is that even though I follow the instructions, the engine always seems to instantly rev up so high that it sounds like it is going to explode. I always end up getting scared and turn it off prematurely. I obviously don't have much experience with R/C stuff, but I have seen others flying their airplanes so I think I know when an engine sounds liek it is revving at normal levels versus when it is too high. Anyone have any idea what I'm talking about?
Thanks in advance!
09-25-2006 | 06:37 PM
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From: salisbury,
MA
RE: First-timer question on my experiences breaking in engine
you should get a rpm tach so you will know exactly what the numbers are and look in your manual to get an idea of what the max should be before you start the engine again.... 2 strokes sound loud(to me anyway) and rotate very vast so you should get used to it
09-25-2006 | 06:43 PM
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From: Decatur,
GA
RE: First-timer question on my experiences breaking in engine
Make sure you have the recommended propeller size too. A prop that's to small will make it rev scary fast.
09-25-2006 | 07:09 PM
#4
RE: First-timer question on my experiences breaking in engine
Agreed, make sure you have the right size prop to begin with. The instructions should tell you what's suitable but a 10x6 or 11x4 would be fine and then there's no way it can rev too high. It also seems you may be starting it at full throttle which is quite ok to do but it can give a bit of a fright until you're used to them. Is the muffler fitted? An open exhaust is very loud and that can make the engine sound like it's running too fast as well.
09-25-2006 | 07:32 PM
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From: , MD
RE: First-timer question on my experiences breaking in engine
Thanks, I will double check the muffler fitting and prop size and buy a tachometer. I was actually hoping I could try breaking it in without a prop (for safety reasons), but I guess thats out of the question.
09-25-2006 | 08:21 PM
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From: , MD
RE: First-timer question on my experiences breaking in engine
maaaybe
but I also ran it with the prop and it seemed just as loud and fast... Did I hurt the engine?
but I also ran it with the prop and it seemed just as loud and fast... Did I hurt the engine?
ORIGINAL: skiman762
Did you run it without a prop ?
Did you run it without a prop ?
09-25-2006 | 09:08 PM
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From: salisbury,
MA
RE: First-timer question on my experiences breaking in engine
how long did you run it without a prop?.... it's hard to say if any damage was done since noone is there to check it out, do you have someone in your club that can help break it in with you?
also did you have the muffler on it?
also did you have the muffler on it?
09-25-2006 | 10:22 PM
#9
RE: First-timer question on my experiences breaking in engine
There's no excuse for that. [:@]
All the information you need is here in this forum. Use the search function and look for engine break in. There is a decent thread on tapered bore break in by Dar. Read it.
If you had done a little homework and did some reading before you started the engine--you would have known that you NEVER run an engine without a prop. NEVER.
Stop what your doing and get some help from a guy at the local flying site or do a search here on RCU and do some reading. There's no excuse for doing what you did to that motor. Too much information and help available to go off and do something like that. Do some homework before you wreck it and cost yourself $100.
Now go tell your engine that your sorry and don't do it again.
All the information you need is here in this forum. Use the search function and look for engine break in. There is a decent thread on tapered bore break in by Dar. Read it.
If you had done a little homework and did some reading before you started the engine--you would have known that you NEVER run an engine without a prop. NEVER.
Stop what your doing and get some help from a guy at the local flying site or do a search here on RCU and do some reading. There's no excuse for doing what you did to that motor. Too much information and help available to go off and do something like that. Do some homework before you wreck it and cost yourself $100.
Now go tell your engine that your sorry and don't do it again.
09-26-2006 | 12:01 AM
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RE: First-timer question on my experiences breaking in engine
Well, I have to agree with the general population here. You better find somebody to help you out of your going to get yourself hurt or somebody else. There is a good chance you "killed" the engine running it without a prop. I would like to know how you got it started in the first place.
09-26-2006 | 02:30 AM
#11
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RE: First-timer question on my experiences breaking in engine
ORIGINAL: jdbeast00
I have tried several times unsuccessfully to break in my engine. I think the model is something similar to TTR40 Thunder Tiger 40 RC Engine...
Basically, what happens is that even though I follow the instructions, the engine always seems to instantly rev up so high that it sounds like it is going to explode. I always end up getting scared and turn it off prematurely. I obviously don't have much experience with R/C stuff, but I have seen others flying their airplanes so I think I know when an engine sounds like it is revving at normal levels versus when it is too high. Anyone have any idea what I'm talking about?
Thanks in advance!
I have tried several times unsuccessfully to break in my engine. I think the model is something similar to TTR40 Thunder Tiger 40 RC Engine...
Basically, what happens is that even though I follow the instructions, the engine always seems to instantly rev up so high that it sounds like it is going to explode. I always end up getting scared and turn it off prematurely. I obviously don't have much experience with R/C stuff, but I have seen others flying their airplanes so I think I know when an engine sounds like it is revving at normal levels versus when it is too high. Anyone have any idea what I'm talking about?
Thanks in advance!
Your engine is an ABC/ABN, tapered-bore type.
The definitive break-in method is described [link=http://www.rcuniverse.com/forum/m_1850473/tm.htm]here[/link].
It must rev pretty high and no damage will result, if you use a properly sized prop (10x6, 9.5x6, 9x6).
09-26-2006 | 06:42 AM
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From: , MD
RE: First-timer question on my experiences breaking in engine
I pushed an electric starter against the cone on the front. It took a lot of pushing and spinning for it to start up...
ORIGINAL: Cyclic Hardover
Well, I have to agree with the general population here. You better find somebody to help you out of your going to get yourself hurt or somebody else. There is a good chance you "killed" the engine running it without a prop. I would like to know how you got it started in the first place.
Well, I have to agree with the general population here. You better find somebody to help you out of your going to get yourself hurt or somebody else. There is a good chance you "killed" the engine running it without a prop. I would like to know how you got it started in the first place.
09-26-2006 | 06:46 AM
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From: , MD
RE: First-timer question on my experiences breaking in engine
ORIGINAL: tukkus
how long did you run it without a prop?
how long did you run it without a prop?
.... it's hard to say if any damage was done since noone is there to check it out, do you have someone in your club that can help break it in with you?
also did you have the muffler on it?
09-26-2006 | 07:06 AM
#14
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RE: First-timer question on my experiences breaking in engine
JD, I had a Fox .74 ABC kick its prop aff and run about 10 seconds with no prop at full throttle, the engine was not damaged. It did a perfect imitation of a siren. I was experimenting with a Macs tuned pipe and a Perry pump carb, when it started to get on the pipe it went lean and shed the prop quicker than a lean fourstroke can.
09-26-2006 | 07:50 AM
#15
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RE: First-timer question on my experiences breaking in engine
"Beast",
Most two-stroke engines would usually not sustain any damage from a flurry of 'un-propped' running.
Most bearings' RPM limits are far beyond the engines' capabilities (even un-propped) and a two-stroke engine's rod is nearly always in compression, so it would not likely 'stretch'...
Check anyway!
Most two-stroke engines would usually not sustain any damage from a flurry of 'un-propped' running.
Most bearings' RPM limits are far beyond the engines' capabilities (even un-propped) and a two-stroke engine's rod is nearly always in compression, so it would not likely 'stretch'...
Check anyway!
09-26-2006 | 09:34 AM
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From: Callahan,
FL
RE: First-timer question on my experiences breaking in engine
"Beast",
Even if no damage was done to your engine this time, do not run it without a prop again. Do like everyone in this thread has been telling you and go get some help from someone at your local club or local hobby shop. If you don't know what you are doing, and you don't, you can get hurt or hurt someone else. GET SOME HELP!!!
Good luck,
Regards,
doubledee
Even if no damage was done to your engine this time, do not run it without a prop again. Do like everyone in this thread has been telling you and go get some help from someone at your local club or local hobby shop. If you don't know what you are doing, and you don't, you can get hurt or hurt someone else. GET SOME HELP!!!
Good luck,
Regards,
doubledee
09-26-2006 | 05:59 PM
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From: Sydney, AUSTRALIA
RE: First-timer question on my experiences breaking in engine
G'day JB,
Let me give you a little info the other contributers seem to assume that you already have.
1. Highest priority...join a club. This has many benefits, including a free advice source (some of it is good advice), Safety issues - it's not a good idea to fly on your own. Insurance from you membership, important in case of any mishaps.
2. Running motors without props is not a good idea (in case you hadn't already guessed). Not from the fact that the revs are much higher, more from the fact that the is NO COOLING!! Overheating you motor WILL turn it to scrap in almost no time.
Air flow over motors and correct lubrication are absolutely essential. Good advice and the companionship found in clubs makes everything much more enjoyable,
Now go and enjoy your new hobby.
Regards
Greggles
Let me give you a little info the other contributers seem to assume that you already have.
1. Highest priority...join a club. This has many benefits, including a free advice source (some of it is good advice), Safety issues - it's not a good idea to fly on your own. Insurance from you membership, important in case of any mishaps.
2. Running motors without props is not a good idea (in case you hadn't already guessed). Not from the fact that the revs are much higher, more from the fact that the is NO COOLING!! Overheating you motor WILL turn it to scrap in almost no time.
Air flow over motors and correct lubrication are absolutely essential. Good advice and the companionship found in clubs makes everything much more enjoyable,
Now go and enjoy your new hobby.
Regards
Greggles
09-26-2006 | 08:04 PM
#19
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RE: First-timer question on my experiences breaking in engine
ORIGINAL: greggles47
G'day JB,
Let me give you a little info the other contributers seem to assume that you already have.
1. Highest priority...join a club. This has many benefits, including a free advice source (some of it is good advice), Safety issues - it's not a good idea to fly on your own. Insurance from you membership, important in case of any mishaps.
2. Running motors without props is not a good idea (in case you hadn't already guessed). Not from the fact that the revs are much higher, more from the fact that the is NO COOLING!! Overheating you motor WILL turn it to scrap in almost no time.
Air flow over motors and correct lubrication are absolutely essential. Good advice and the companionship found in clubs makes everything much more enjoyable,
Now go and enjoy your new hobby.
Regards
Greggles
G'day JB,
Let me give you a little info the other contributers seem to assume that you already have.
1. Highest priority...join a club. This has many benefits, including a free advice source (some of it is good advice), Safety issues - it's not a good idea to fly on your own. Insurance from you membership, important in case of any mishaps.
2. Running motors without props is not a good idea (in case you hadn't already guessed). Not from the fact that the revs are much higher, more from the fact that the is NO COOLING!! Overheating you motor WILL turn it to scrap in almost no time.
Air flow over motors and correct lubrication are absolutely essential. Good advice and the companionship found in clubs makes everything much more enjoyable,
Now go and enjoy your new hobby.
Regards
Greggles
-------------------
Running it without a prop will ruin the engine, in most, but not all, instances.
As Hobbsy pointed out, his Fox .74 was okay, but the Fox .74 is a very robust engine. Most less robust engines will suffer some kind of damage, usually to the crankpin or connecting rod.
Never try to run any engine without some kind of load on the crankshaft, such as a flywheel or a prop. As Greggles mentioned, the engine needs to be cooled properly too. A prop does this adequately, in most instances.
Welcome to modeling and don't let a few mistakes shake you from pursueing the hobby. It is loads of fun and you will make lots of friends. Join a club, as was previously mentioned.
09-27-2006 | 10:13 AM
#20
RE: First-timer question on my experiences breaking in engine
ORIGINAL: Artisan
Never try to run any engine without some kind of load on the crankshaft, such as a flywheel or a prop.
Never try to run any engine without some kind of load on the crankshaft, such as a flywheel or a prop.
).
09-27-2006 | 11:10 AM
#21
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RE: First-timer question on my experiences breaking in engine
ORIGINAL: downunder
A flywheel isn't really a load on the engine except when it's accelerating because the flywheel's inertia will slow down the rate of acceleration. It'll still peak out like a shaft run (which will loosen the screws holding the front end and split the disc valve on an old K&B 40 pylon engine....ask me how I know ).
ORIGINAL: Artisan
Never try to run any engine without some kind of load on the crankshaft, such as a flywheel or a prop.
Never try to run any engine without some kind of load on the crankshaft, such as a flywheel or a prop.
).
------------
You are absolutely right. Thanks for the correction.
I was thinking of utility two-strokes (gas/petrol) with cooling fins on the flywheel and a shroud, or boats in the water and forgot about not having a prop in the water available when running just a flywheel.
09-27-2006 | 12:10 PM
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From: Harker Heights,
TX
RE: First-timer question on my experiences breaking in engine
I just got through reading this post and I got to say I'm totally flabbergasted_____ This is the 1st time I've ever heard of someone even a noob ever doing this_____ WOW!!!!!!!!
I just got off the Thunder Tiger website and it clearly says to mount a prop for break-in...... So once again.....
WOW!!!!!!!!!!!!
I just got off the Thunder Tiger website and it clearly says to mount a prop for break-in...... So once again.....
WOW!!!!!!!!!!!!
09-27-2006 | 07:13 PM
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From: germantown,
TN
RE: First-timer question on my experiences breaking in engine
OK, everyone. I think poor JD gets the idea by now.[
]
However, those suggesting you get some help, JD, are correct. I'm sure your local flying field has many people more than willing to help you.
Good luck,
Tony
]However, those suggesting you get some help, JD, are correct. I'm sure your local flying field has many people more than willing to help you.
Good luck,
Tony
09-27-2006 | 07:39 PM
#24
RE: First-timer question on my experiences breaking in engine
There's a reference to this thread over in the beginners section and the point is that he is a beginner and we all had to start somewhere. There are some things (like using a prop) that are so obvious even if you've only ever run an engine once that we just don't think about it. But if you've never run an engine and don't know the first thing about them....
I've just bought my first electric model and I'm totally out of my depth trying to understand what the heck they're talking about. Believe me, I know what it feels like to be a newbie now
because who'd have believed they run in a brushed motor (how do they work without brushes?) by giving them a shaft run in a glass of water?
I've just bought my first electric model and I'm totally out of my depth trying to understand what the heck they're talking about. Believe me, I know what it feels like to be a newbie now
because who'd have believed they run in a brushed motor (how do they work without brushes?) by giving them a shaft run in a glass of water?
09-27-2006 | 07:39 PM
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From: , MD
RE: First-timer question on my experiences breaking in engine
Wow...I can tell you guys are pretty serious about your hobby
I will join a club and do things the right way from now on. Thanks everyone!
I will join a club and do things the right way from now on. Thanks everyone!
