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Old 11-21-2010, 09:52 PM
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What is your opinion on MotoMan's Break In Procedure?

It's almost time to break in my new Hemi & instead of the "easy" break in I did with my 2005 Hemi (which has 257,000 miles), I'm thinking about following MotoMan's "secrets" which are basically "Run it Hard".

I tend to think the owners manual break in procedure was written by lawyers who need to protect the manufacturer. If MotoMan "secrets" are true the manufacturer can't tell us that..

What do you think? Run it hard (while keeping engine temp. normal) or Run it easy and keep it under 55 while varying the speed?

http://www.mototuneusa.com/break_in_secrets.htm
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Old 11-21-2010, 10:12 PM
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Re: What is your opinion on MotoMan's Break In Procedure?

I've always said "run em in hard and they run long and strong".

With a couple of proviso's;

1. No bashing the rev limiter
2. No sustained period at constant throttle or constant RPM
3. No high load or hard running when cold (that goes for any engine anytime though!)

Enjoy!
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Old 11-21-2010, 10:14 PM
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Re: What is your opinion on MotoMan's Break In Procedure?

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Originally Posted by Marlin View Post
I've always said "run em in hard and they run long and strong".

With a couple of proviso's;

1. No bashing the rev limiter
2. No sustained period at constant throttle or constant RPM
3. No high load or hard running when cold (that goes for any engine anytime though!)

Enjoy!
That's what I wanted to hear! Thanks!
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Old 11-22-2010, 08:30 AM
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Re: What is your opinion on MotoMan's Break In Procedure?

Break it in the way you plan to drive it long term heeding Marlin's suggestions.
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Old 11-22-2010, 10:15 AM
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Re: What is your opinion on MotoMan's Break In Procedure?

That's how I break in all engines. Never had a problem.
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Old 12-09-2010, 09:41 AM
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Re: What is your opinion on MotoMan's Break In Procedure?

On initial startup check for leaks... insure transmission fluid is at correct level... once engine reaches operational temperature... take it out on the road and RUN IT WOT 1st 2nd & 3rd then let off and throw it into neutral... bring it to a stop and run it again WOT 1st 2nd & 3rd and repeat 4-5 times... after that just run it normal.

It’s important you make all this happen within the first 20 minutes...

Why.... PISTON RING SEAL! Your hone marks on your cylinders act as a file on your rings. Under light loads the rings do not pressurize against the inner bore enough to take advantage of the hone marks. The only way to get those rings seated perfectly is to run it at WOT UNDER LOAD...this forces the rings to press up against the inner bore hone marks and file them to a perfect match/seal. In a short period of time the hone marks will lose their sharp edges and their ability to file.... The window is small but very important to the future of that engine. The reason I say let off and throw it into nutral is that the rolling load does not help sealing the cylinders.... You want WOT load for the first few runs...

Engines that are run hard during beak in will ALWAYS run faster burn less oil and be more fuel efficient than those that were broken in lightly. So run it like you stole it for a long happy engine life.

SPEED SAFE, NICK
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Old 12-12-2010, 02:48 PM
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Re: What is your opinion on MotoMan's Break In Procedure?

Quote:
Originally Posted by AIR_RAM View Post
On initial startup check for leaks... insure transmission fluid is at correct level... once engine reaches operational temperature... take it out on the road and RUN IT WOT 1st 2nd & 3rd then let off and throw it into neutral... bring it to a stop and run it again WOT 1st 2nd & 3rd and repeat 4-5 times... after that just run it normal.

Its important you make all this happen within the first 20 minutes...

Why.... PISTON RING SEAL! Your hone marks on your cylinders act as a file on your rings. Under light loads the rings do not pressurize against the inner bore enough to take advantage of the hone marks. The only way to get those rings seated perfectly is to run it at WOT UNDER LOAD...this forces the rings to press up against the inner bore hone marks and file them to a perfect match/seal. In a short period of time the hone marks will lose their sharp edges and their ability to file.... The window is small but very important to the future of that engine. The reason I say let off and throw it into nutral is that the rolling load does not help sealing the cylinders.... You want WOT load for the first few runs...

Engines that are run hard during beak in will ALWAYS run faster burn less oil and be more fuel efficient than those that were broken in lightly. So run it like you stole it for a long happy engine life.

SPEED SAFE, NICK
+1 good info. Thanks!
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Old 12-12-2010, 03:45 PM
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Re: What is your opinion on MotoMan's Break In Procedure?

What happens if you get the truck with 20 or so mi on it? should you still do a hard break in or is it too late?
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Old 12-16-2010, 12:56 PM
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Re: What is your opinion on MotoMan's Break In Procedure?

The ridges of a crosshatch in the cylinder are microscopic and are very necessary to exist or oil does not get distributed well and rubbing occurs as well as poor sealing. The oil also must prevent the crosshatching from being worn down. Trying to use the crosshatching as a file and saying after a few miles its worn down is a bit much...

Also the idea of cylinder pressures being "thousands of psi" is absurd
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Old 12-17-2010, 06:46 AM
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Re: What is your opinion on MotoMan's Break In Procedure?

Spring for that lifetime warranty from Chrysler and then drive it like you stole it... All the time
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Old 12-17-2010, 08:36 AM
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Re: What is your opinion on MotoMan's Break In Procedure?

I completely agree on breaking in the vehicle like you would drive it normally, varied speeds and cool down cycles all help everything seat the way it should.

I do have a couple concerns about the take it out and run it a WOT the first time you drive it method though. Firstly, modern ring technology has allowed for rings that seat within the first strokes of engine turn over, so long before you ever get your car the rings are already well on their way to being seated.
Secondly, running at WOT before a proper tranny/transfer case/rear end warm up will damage other components in the drive train. I built a monster motor for my Z06 and put a brand new DTE rear diff in the car then immediately ran it on the dyno, the rear end completely disintegrated...
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Old 01-05-2011, 11:54 AM
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Re: What is your opinion on MotoMan's Break In Procedure?

I have broken every engine in hard. I have always had strong running engines that never burned oil. Even some engines (like my R6) seemed to be more powerful than other similar R6's. The only thing I attribute to being faster was the hard break in.

I have ALWAYS, with EVERYTHING:

Take it out, 1st gear, WOT to 4-5000 rpms, let off leaving the transmission in gear, I always felt/read this will help get the small metal shaving of the rings sealing out the piston/exhaust better. Do this a couple time, change the oil early (500-1000 miles) and then drive normal.
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