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Breakin In New Engine

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Old Jan 26, 2010 | 11:38 AM
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Default Breakin In New Engine

Just wanted to ask if there was a proper way of breaking in a new LS3 engine? My coupe has about 300 miles currently, and is there a rpm range I should not hit...I generally shift gears at around 4000-5000 rpms. If this topic has been done to death, please disregard this e-mail as I'm still searching through the threads but didn't find anything....thanks in advance!
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Old Jan 26, 2010 | 11:47 AM
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Originally Posted by sun_bill1974
Just wanted to ask if there was a proper way of breaking in a new LS3 engine? My coupe has about 300 miles currently, and is there a rpm range I should not hit...I generally shift gears at around 4000-5000 rpms. If this topic has been done to death, please disregard this e-mail as I'm still searching through the threads but didn't find anything....thanks in advance!
I believe that the break in period is more for the clutch than the engine... I'd imagine it's already been run on an engine dyno to test it before leaving the plant. Typically I just run it up to a thousand RPM before redline and let the car go through alot of decl to seal the rings... fair amount of WOT too in single gears, just no hard gear changes.
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Old Jan 26, 2010 | 12:21 PM
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300 miles, the important part of engine break-in has past. It's the first 400 miles that are important.

Consider changing the oil to get rid of any metal filings.

The engine break is described in the manual.

a++ Cedric
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Old Jan 26, 2010 | 01:50 PM
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why do you normaly shift between 4000-5000, are you racing? would you drive a say, ford focus the same way? I believe the "owners manual" has comments about "break in procedure" does'nt it? something like.... vary rpm and speed up and down without going to fast or using to much rpm's for say the first 1000 miles or so.....

Last edited by CMY SIX; Jan 26, 2010 at 01:53 PM.
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Old Jan 26, 2010 | 03:44 PM
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I guess the question is, what's considered high rpm...but based on your response, 4-5K rpm is too high? I wasn't aware the manual explains about breaking in a new engine....I'll give it a look tonight, thanks.

Originally Posted by CMY SIX
why do you normaly shift between 4000-5000, are you racing? would you drive a say, ford focus the same way? I believe the "owners manual" has comments about "break in procedure" does'nt it? something like.... vary rpm and speed up and down without going to fast or using to much rpm's for say the first 1000 miles or so.....
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Old Jan 26, 2010 | 04:03 PM
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Originally Posted by sun_bill1974
I guess the question is, what's considered high rpm...but based on your response, 4-5K rpm is too high? I wasn't aware the manual explains about breaking in a new engine....I'll give it a look tonight, thanks.
Street driving wise, I rarely reach 2 400 rpm. 4-5k rpm is ok for a small engine because it isn't powerful.

a++ Cedric
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Old Jan 26, 2010 | 04:43 PM
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keep the revs down within reason and try and go thru alot of rpm ranges, dont set the cruise and drive 100 straight. This will help seat the rings and not groove the cylinders. But on a new ls3 its really no huge thing they are bulletproof
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