Engine "Run" in Disaster
#1
Engine "Run" in Disaster
I had a shocker today. Before I start I have broken in about 10 .21 engines and never have had this problem or any other problem.
1. Started to run in my new sirio. Heated it up to 120c with a heat gun. Started it up it was having trouble idling. Had a look inside engine and noticed a big chunk broken from piston.
2. After some cursing I took out a new nova rossi that I had spare in a box. The run in process wet o.k. Ran about 750 ml of fuel with no problems. Took the back plate off to put some after run oil on the rear bearing and again in the same spot a huge chunk of piston was stuck by oil on the backplate. Strange thing is that the engine was great during the run in process. Hotest the engine got was 113c. It remained steady between 90 and 113c during the run in process.
I use the method outlined in the run in bible in international rctech offroad forum. I have always used this process with great success.
Question would these issues be due to lack of lubrication in the fuel?
1. Started to run in my new sirio. Heated it up to 120c with a heat gun. Started it up it was having trouble idling. Had a look inside engine and noticed a big chunk broken from piston.
2. After some cursing I took out a new nova rossi that I had spare in a box. The run in process wet o.k. Ran about 750 ml of fuel with no problems. Took the back plate off to put some after run oil on the rear bearing and again in the same spot a huge chunk of piston was stuck by oil on the backplate. Strange thing is that the engine was great during the run in process. Hotest the engine got was 113c. It remained steady between 90 and 113c during the run in process.
I use the method outlined in the run in bible in international rctech offroad forum. I have always used this process with great success.
Question would these issues be due to lack of lubrication in the fuel?
#3
I was putting the heat on the top of the heatsink
#4
they were both never taken apart prior to starting?
#6
with the nova i only noticed it when I took the backplate off? Not sure if it was due to this. I did not know that you can chip the piston doing this. Can you still run a motor with a chiped piston?
#7
#8
Thats why they have a groove at the top of the back plate as the bottom of the piston goes into the top of the back plate so you must make sure the piston is at top before you take this back plate off...surely you knew this??didnt you say you have run in about 10x motors as its rule number 1 really
if this is not what caused it it sounds like you may have heated the head up to much..hard to say but 120c I presume is very warm for a new motor..
if this is not what caused it it sounds like you may have heated the head up to much..hard to say but 120c I presume is very warm for a new motor..
#9
you should try and heat all of the engine...not just the head..only takes about 40 seconds with a heat gun
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