break-in (roderen)
Geplaatst: do 07 jul, 2005 13:44
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Break-In Procedure
Manufacturer's all have different breakin procedures.
And they should be followed - for the most part.
But, lets talk for a minute about them, since they may not be specific enough to answer your questions.
~ Is is not good to underrev any engine a lot. Due the dynamics of crank,
rod and piston motion,
the piston can create undesireable wear patterns in the cynlinder
if run too slow. During break in, it is especially important not to underrev.
Underreving is turning it at too slow of an rpm.
Too slow varies from engine to engine.
~ It is not good to run an engine a long time at a single RPM
during break in if possible. Use different speeds and or gears.
~ The reason some manufacturers require 15 to 30 minutes of running
with no load at 2000 RPM or so is due to break in some types of camshafts and lifters.
If your machine's manual doesn't say to do this, don't do it.
~ There is reduced lubrication on the cylinder and piston when cold.
While it is always bad to run full throttle when the engine is cold
due to cold oil, it is much worse to do it during breakin.
~ Rings generate extra heat during break in.
If the oil on the cylinder walls gets too hot, it can break down
and glaze the cylinder wall before the rings seat.
This will basically ruin the engine since without seated rings,
the engine will have excessive blow by and/or oil consumption
at an earlier than expected life. Therefore if the manufacturer
specifies a max RPM, or a MAX throttle opening, it should be followed.
~ Not running the engine hard enough can also be detreimental too.
The manufacturer's recommendations should be followed
(unless you are positively sure they are wrong),
since the manufacturer knows the materials used,
the hardness of the rings and cylinder, and the ring configuration.
It all plays into how an engine should be broken in.
~ Some engines are recommended to be broken in at full thottle,
but they are usually kept at the operating RPM's somewhere near
peak torue (usually mid RPM) and nowhere near peak horsepower.
Higher RPM's generate more ring heat, but without
as much ring pressure and is not only less effective but could be harmful.
~ Rings and cylinders are usually your principal concern.
However, some engines need head bolt retightening,
others need additional attention. Follow the manufacturer's instructions.
Summary: Follow instructions, avoid under revving,
avoid a single rpm, don't stomp on it cold, don't over rev,
and you need to make it work hard enough to seat the rings.
Break-In Procedure
Manufacturer's all have different breakin procedures.
And they should be followed - for the most part.
But, lets talk for a minute about them, since they may not be specific enough to answer your questions.
~ Is is not good to underrev any engine a lot. Due the dynamics of crank,
rod and piston motion,
the piston can create undesireable wear patterns in the cynlinder
if run too slow. During break in, it is especially important not to underrev.
Underreving is turning it at too slow of an rpm.
Too slow varies from engine to engine.
~ It is not good to run an engine a long time at a single RPM
during break in if possible. Use different speeds and or gears.
~ The reason some manufacturers require 15 to 30 minutes of running
with no load at 2000 RPM or so is due to break in some types of camshafts and lifters.
If your machine's manual doesn't say to do this, don't do it.
~ There is reduced lubrication on the cylinder and piston when cold.
While it is always bad to run full throttle when the engine is cold
due to cold oil, it is much worse to do it during breakin.
~ Rings generate extra heat during break in.
If the oil on the cylinder walls gets too hot, it can break down
and glaze the cylinder wall before the rings seat.
This will basically ruin the engine since without seated rings,
the engine will have excessive blow by and/or oil consumption
at an earlier than expected life. Therefore if the manufacturer
specifies a max RPM, or a MAX throttle opening, it should be followed.
~ Not running the engine hard enough can also be detreimental too.
The manufacturer's recommendations should be followed
(unless you are positively sure they are wrong),
since the manufacturer knows the materials used,
the hardness of the rings and cylinder, and the ring configuration.
It all plays into how an engine should be broken in.
~ Some engines are recommended to be broken in at full thottle,
but they are usually kept at the operating RPM's somewhere near
peak torue (usually mid RPM) and nowhere near peak horsepower.
Higher RPM's generate more ring heat, but without
as much ring pressure and is not only less effective but could be harmful.
~ Rings and cylinders are usually your principal concern.
However, some engines need head bolt retightening,
others need additional attention. Follow the manufacturer's instructions.
Summary: Follow instructions, avoid under revving,
avoid a single rpm, don't stomp on it cold, don't over rev,
and you need to make it work hard enough to seat the rings.