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Project OJ - Losi 5 build

Seandonato73

Well-Known Member
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2,488
Was gonna go on a big rant about how over embellished brake in procedures have become. But I'll give the short version. It's either gonna work or not. You stand a better chance of glazing a cylinder babying it for long periods of time. Do a tank and have at it. Checking the head torque is a good idea, but not totally necessary. The only time I've done that is if specified by the mfg.
 

Seandonato73

Well-Known Member
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2,488
In layman's terms, your polishing the cylinder with the ring. Its referred to as "glazing the cylinder" it what happens when the ring doesn't seat to the cylinder properly. The polished serface doesn't allow the ring to form a good seal. You can rev an engine to the moon. Without a proper load you not forcing the ring to work right. More load causes the engine to work harder which in turn forces the ring tighter against the cylinder wall. The whole break in process just knocks off the microscopic peaks on the cylinder. Thus mating the ring to the cylinder. Clear as mud?
 

Z.hb71

Well-Known Member
Messages
6,978
In layman's terms, your polishing the cylinder with the ring. Its referred to as "glazing the cylinder" it what happens when the ring doesn't seat to the cylinder properly. The polished serface doesn't allow the ring to form a good seal. You can rev an engine to the moon. Without a proper load you not forcing the ring to work right. More load causes the engine to work harder which in turn forces the ring tighter against the cylinder wall. The whole break in process just knocks off the microscopic peaks on the cylinder. Thus mating the ring to the cylinder. Clear as mud?
Ahh that makes alot of sense. And if your bassically polishing the cylinder, wouldn't that effect the cross hatching and the cylinder wouldn't hold oil as well as it should/at all? I'd think so.
 

Seandonato73

Well-Known Member
Messages
2,488
Actually the opposite it true. It's from too much oil being present on the cylinder walls filling the valleys and getting "caked on" when the ring isnt forced out from loading the engine it doesn't do near as good of a job wiping the oil off the cylinder. Essentially acting like a build up or varnish of sorts. Theres a fine line of enough oil to lubricate and seal and too much or too little. Conversely if you burnish a cylinder it's from not enough oil being retained on the cylinder walls. Instead of looking like a mirror finish it's more of a black grey color to the cylinder. Basically same symptoms for either,(no power and smoking) although in 2 strokes it's more likely to glaze as most people are prudent in making sure the right oil mix is used. (Or too much oil) basically you just want to get the engine up to normal temp and get a load on it.
Sorry for the crappy explanation im.not a very good teacher
 

cbaker65

Well-Known Member
Messages
968
Actually the opposite it true. It's from too much oil being present on the cylinder walls filling the valleys and getting "caked on" when the ring isnt forced out from loading the engine it doesn't do near as good of a job wiping the oil off the cylinder. Essentially acting like a build up or varnish of sorts. Theres a fine line of enough oil to lubricate and seal and too much or too little. Conversely if you burnish a cylinder it's from not enough oil being retained on the cylinder walls. Instead of looking like a mirror finish it's more of a black grey color to the cylinder. Basically same symptoms for either,(no power and smoking) although in 2 strokes it's more likely to glaze as most people are prudent in making sure the right oil mix is used. (Or too much oil) basically you just want to get the engine up to normal temp and get a load on it.
Sorry for the crappy explanation im.not a very good teacher
Usually ,too much oil ,or the oil not burning off ,will fowl the spark plug or cake up at the exhaust port ,the exhaust port is the
most important to keep in check ,you don't want the crap to fall back into the cylinder an scar it!

I run different types of 2 stroke oil's ,an I always have to keep the exhaust port clean!
 

Seandonato73

Well-Known Member
Messages
2,488
This is specifically to break in. Not once the ring has set. After that it's another set of issues.
 
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