LT1-LT4 Modifications 1993-97 Gen II Small Block V8

New Engine & Clutch Break In

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Old Apr 22, 2009 | 07:01 AM
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Default New Engine & Clutch Break In

ok. my engines currently getting fully rebuilt with new everything. im also installing a new clutch at the same time. how should i break them in ? i know the clutch has to be very slow stop and go with nothing abusive. how should i break in the engine ?
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Old Apr 22, 2009 | 09:12 AM
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I broke my clutch in for a full 500 easy miles and now it drives like butter.

As for the engine, it needs a wide range of RPMs to break in properly. For example, 1000 miles of 60 MPH cruising on the highway is not a good way to break it in. Drive it around town, starting and stopping, slowly taking the RPMs up and work your way through a few thousand miles as if you were stretching out a rubber band.
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Old Apr 22, 2009 | 12:04 PM
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When you break the clutch in. just don't drive the car heavy, trust me. You'll regret it later by having to swap a PP or new disc. IIRC, I never shifted about like 2500 until a like 200 miles, and then like 3000 at 300 miles, and 3500 at 500 miles. I didn't go WOT shifting until like 1k miles. (RPMs may not be completely accurate, but you get the idea) My clutch is very smooth, unlike my first PP/Disc I was on, I gave it hell too soon and it chattered like no other..

As far as the engine break-in. You want the motor to see every range of RPMs
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Old Apr 22, 2009 | 12:20 PM
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thanks for the replys guys. so itll be ok to break in my engine with the course of breaking in my clutch ? easy driving. nothing over to high of an RPM right?
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Old Apr 22, 2009 | 12:36 PM
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Originally Posted by SoxXpupPeT
thanks for the replys guys. so itll be ok to break in my engine with the course of breaking in my clutch ? easy driving. nothing over to high of an RPM right?
I would break in the engine properly, regardless of what it does to the clutch, breaking in the engine and seating the rings is paramount.
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Old Apr 22, 2009 | 12:47 PM
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^^ agreed getting the motor broken in properly is much more important than the clutch and that can easily be replaced for fairly cheap (compared to the motor)
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Old Apr 22, 2009 | 02:54 PM
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you can do both....after you get the motor running and COMPLETELY check everything during the 1st 15 min. change oil/filter and drive at varied RPM's. Take car up to 3500-4500 RPM's in gear and let the motor brake by letting off gas. Do this accelerate/decelerate thing at varied RPM's. This will have no negative effect on clutch.

basically just don't bitch slap the car for 500 miles but do accelerate up to 5k-5500roms in the early stages.
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Old Apr 22, 2009 | 07:24 PM
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Good info, Im going to be breaking in a new motor and clutch also very soon (spun a rod bearing last year). Anyone else got any tips/tricks?
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Old Apr 22, 2009 | 07:52 PM
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The powergrip HD doesn't require any break in, and you should break in the engine however your engine builder tells you to.
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Old Apr 22, 2009 | 10:53 PM
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thanks guys. i just want afew different perspectives and thoughts about doing both at the same time like that. id perfer not to **** either of them up but if i have to **** up the clutch to save my engine i certainly will
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