Break-in translation requested :-)
Thread Starter
Instructor
Joined: Aug 2009
Posts: 193
Likes: 0
From: Northern Alabama
Break-in translation requested :-)
Anxious for my C7 order to work its way through the system, I was browsing the owners manual I doenloaded ...
Under break-in, there is this guidance:
Do not let the engine labor. Never lug the engine. With a manual transmission, shift to the next lower gear. This rule applies at all times, not just during the break-in period.
They already said earlier not to go over 4000 revs so what is additionally meant by "Do not let the engine labor" ( ie beyond rev levels). What is "lug the engine"?
Thanks
Under break-in, there is this guidance:
Do not let the engine labor. Never lug the engine. With a manual transmission, shift to the next lower gear. This rule applies at all times, not just during the break-in period.
They already said earlier not to go over 4000 revs so what is additionally meant by "Do not let the engine labor" ( ie beyond rev levels). What is "lug the engine"?
Thanks
Le Mans Master
Joined: Dec 2013
Posts: 5,887
Likes: 1,555
From: Calgary Alberta
It means don't have the revs too low when driving. Low revs while cruising along is fine but downshift if you're going to accelerate. Some will tell you it's ok to accelerate from very low revs. It's not. Not just at break in, but at any time.
Thread Starter
Instructor
Joined: Aug 2009
Posts: 193
Likes: 0
From: Northern Alabama
E-Ray, 3LZ, ZER, LIFT
Joined: Sep 2007
Posts: 34,982
Likes: 12,383
From: NE South Carolina
Anxious for my C7 order to work its way through the system, I was browsing the owners manual I doenloaded ...
Under break-in, there is this guidance:
Do not let the engine labor. Never lug the engine. With a manual transmission, shift to the next lower gear. This rule applies at all times, not just during the break-in period.
They already said earlier not to go over 4000 revs so what is additionally meant by "Do not let the engine labor" ( ie beyond rev levels). What is "lug the engine"?
Thanks
Under break-in, there is this guidance:
Do not let the engine labor. Never lug the engine. With a manual transmission, shift to the next lower gear. This rule applies at all times, not just during the break-in period.
They already said earlier not to go over 4000 revs so what is additionally meant by "Do not let the engine labor" ( ie beyond rev levels). What is "lug the engine"?
Thanks
Last edited by JerryU; Nov 19, 2014 at 12:14 PM.
Moderator
Joined: Feb 2006
Posts: 39,115
Likes: 17,972
From: DFW Area TX
For the first 2414 km (1500 mi):
. Do not participate in track
events, sport driving schools,
or similar activities during the
first 2414 km (1500 mi).
. Check engine oil with every
refueling and add if necessary.
Oil and fuel consumption may be
higher than normal during the
first 2414 km (1500 mi).
FYI, the red-line on the tach will change once you hit 500 miles. It also is lower until the engine is sufficiently warmed up.
Safety Car
Joined: Dec 2007
Posts: 4,070
Likes: 162
From: Coralville Iowa
You'll know it if you're doing it - the car doesn't like it. You feel all kinds of nasty things in the drivetrain as it tries to "fight" its way out of the low rpm condition. VERY high loads on key parts like bearings, etc. that leads to premature wear or failure. Increased chance of pre-ignition (pinging / detonation). All bad. It's really quite easy to avoid.
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Thread Starter
Instructor
Joined: Aug 2009
Posts: 193
Likes: 0
From: Northern Alabama
Break in period is 500 miles, not 1,500. The 1,500 only applies to the following items:
For the first 2414 km (1500 mi):
. Do not participate in track
events, sport driving schools,
or similar activities during the
first 2414 km (1500 mi).
. Check engine oil with every
refueling and add if necessary.
Oil and fuel consumption may be
higher than normal during the
first 2414 km (1500 mi).
FYI, the red-line on the tach will change once you hit 500 miles. It also is lower until the engine is sufficiently warmed up.
For the first 2414 km (1500 mi):
. Do not participate in track
events, sport driving schools,
or similar activities during the
first 2414 km (1500 mi).
. Check engine oil with every
refueling and add if necessary.
Oil and fuel consumption may be
higher than normal during the
first 2414 km (1500 mi).
FYI, the red-line on the tach will change once you hit 500 miles. It also is lower until the engine is sufficiently warmed up.
My "... lots of things to think about for those first 1500 miles" comment spanned all three regimes
Thanks
Le Mans Master
Joined: Apr 2012
Posts: 7,814
Likes: 2,266
From: Brighton MI
As others have stated, lugging an engine is NEVER good, but is REALLY BAD during the break-in period.
It is important to understand that what constitutes "lugging" is not only a function of rpm but also engine load and number of cylinders. A V-8 can tolerate load at lower rpms than a 4-cyl due to twice as many power strokes per revolution of the crank. That said, ANY engine can be "lugged" given the right circumstances.
Cruising along at a steady speed on a flat road at 1000 rpm is not lugging an engine. Trying to maintain that same speed at the same rpm on a steep incline is lugging the engine. Trying to accelerate with any authority at all from that same rpm would also lug the engine.
Automatics are programmed to downshift and prevent lugging, so this is mainly a manual trans issue. If you sense the engine is laboring to accelerate or maintain speed, it's time to downshift.
It is important to understand that what constitutes "lugging" is not only a function of rpm but also engine load and number of cylinders. A V-8 can tolerate load at lower rpms than a 4-cyl due to twice as many power strokes per revolution of the crank. That said, ANY engine can be "lugged" given the right circumstances.
Cruising along at a steady speed on a flat road at 1000 rpm is not lugging an engine. Trying to maintain that same speed at the same rpm on a steep incline is lugging the engine. Trying to accelerate with any authority at all from that same rpm would also lug the engine.
Automatics are programmed to downshift and prevent lugging, so this is mainly a manual trans issue. If you sense the engine is laboring to accelerate or maintain speed, it's time to downshift.
