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  #13  
Old 03-27-2011, 12:26 PM
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Re: What's The Best Way To Break-In the Hemi ??

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Originally Posted by Dan JGC View Post
Doesn't the manual say use 89, but 87 is "acceptable". It says nothing about 91.

Then it probably says nothing either about the 93, which is offerred in many states like Michigan. Premium fuel is totally fine for the HEMI motor and in the case of power, better.
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Old 03-27-2011, 12:35 PM
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Re: What's The Best Way To Break-In the Hemi ??

Use regular gasoline, don't let it go below half tank, push the engine to the max every time you can, change oil (synthetic) every 2K for the first 6K then, you'll have a sweet ride.
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Old 03-27-2011, 12:47 PM
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Re: What's The Best Way To Break-In the Hemi ??

Like this:

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Old 03-27-2011, 01:17 PM
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Re: What's The Best Way To Break-In the Hemi ??

^^^ That's a great photo!

My dealer....for what it is worth...said no fuel above 89 (at least as it applies to Florida) since it burns hotter and is harder on the engine. Sounds reasonable and the manual doesn't day 91 is OK or should be used to 89 it is for me.

I def need to cruise it to Key West someday.....the ride is smooth...enjoying every minute of it. Will try and vary the RPM's some more.
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Old 03-27-2011, 02:10 PM
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Re: What's The Best Way To Break-In the Hemi ??

Quote:
Originally Posted by Dan JGC View Post
^^^ That's a great photo!

My dealer....for what it is worth...said no fuel above 89 (at least as it applies to Florida) since it burns hotter and is harder on the engine. Sounds reasonable and the manual doesn't day 91 is OK or should be used to 89 it is for me.

I def need to cruise it to Key West someday.....the ride is smooth...enjoying every minute of it. Will try and vary the RPM's some more.

Do what your dealer said... but premium gasoline will not damage a HEMI motor and in fact runs cleaner. GM recommends premium for their 6L motors. The only pump gas that could remotely cause engine damage is 87 octane or a lower octane gas that could detonate before the spark ignites it.
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Old 03-27-2011, 02:31 PM
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Re: What's The Best Way To Break-In the Hemi ??

Now you guys have me nervous. I did about a 80 mile drive at a constant 65-75 on the expressway home from the dealer. Picked it up with 4 miles on the odometer. Poop.
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Old 03-27-2011, 02:35 PM
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Re: What's The Best Way To Break-In the Hemi ??

ENGINE BREAK-IN RECOMMENDATIONS
A long break-in period is not required for the engine and
drivetrain (transmission and axle) in your vehicle.
Drive moderately during the first 300 miles (500 km).
After the initial 60 miles (100 km), speeds up to 50 or
55 mph (80 or 90 km/h) are desirable.

While cruising, brief full-throttle acceleration within the
limits of local traffic laws, contributes to a good break-in.
Wide-open throttle acceleration in low gear can be detrimental
and should be avoided.

................

Either the above language from the owner's manual is complete gibberish, or my brain is full of gibberish.....regardless, someone please help clarify....

What does "drive moderately" mean? Don't accelerate, decelerate hard? Don't exceed a certain speed? Stay off the interstate?

What does "After the initial 60 miles (100 km), speeds up to 50 or
55 mph (80 or 90 km/h) are desirable" mean? After 60 miles, should I not exceed 50 or 55 mph until 300 miles? What about before 60 miles, what speed should I not exceed?

The recommendation for "full-throttle acceleration" is also unclear. Should this be accomplished between 60 and 300 miles? Should I stop accelerating at 50 or 55 mph?
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Old 03-27-2011, 02:50 PM
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Re: What's The Best Way To Break-In the Hemi ??

Quote:
Originally Posted by bobkbusch View Post
ENGINE BREAK-IN RECOMMENDATIONS
A long break-in period is not required for the engine and
drivetrain (transmission and axle) in your vehicle.
Drive moderately during the first 300 miles (500 km).
After the initial 60 miles (100 km), speeds up to 50 or
55 mph (80 or 90 km/h) are desirable.

While cruising, brief full-throttle acceleration within the
limits of local traffic laws, contributes to a good break-in.
Wide-open throttle acceleration in low gear can be detrimental
and should be avoided.

................

Either the above language from the owner's manual is complete gibberish, or my brain is full of gibberish.....regardless, someone please help clarify....

What does "drive moderately" mean? Don't accelerate, decelerate hard? Don't exceed a certain speed? Stay off the interstate?

What does "After the initial 60 miles (100 km), speeds up to 50 or
55 mph (80 or 90 km/h) are desirable" mean? After 60 miles, should I not exceed 50 or 55 mph until 300 miles? What about before 60 miles, what speed should I not exceed?

The recommendation for "full-throttle acceleration" is also unclear. Should this be accomplished between 60 and 300 miles? Should I stop accelerating at 50 or 55 mph?
I'm with you, it's all as clear as mud.
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  #21  
Old 03-27-2011, 04:03 PM
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Re: What's The Best Way To Break-In the Hemi ??

ENGINE BREAK-IN RECOMMENDATIONS
A long break-in period is not required for the engine and
drivetrain (transmission and axle) in your vehicle.

Drive moderately during the first 300 miles (500 km).
After the initial 60 miles (100 km), speeds up to 50 or
55 mph (80 or 90 km/h) are desirable.

DRIVE CALMY AND VARY YOUR SPEED AND MORE IMPORTANTLY THE REVS OF THE MOTOR FOR THE FIRST 300 MILES. DONT GO ANY FASTER THAN 55MPH.


While cruising, brief full-throttle acceleration within the
limits of local traffic laws, contributes to a good break-in.
Wide-open throttle acceleration in low gear can be detrimental
and should be avoided.


DONT FLOOR IT UNDER SAY 40MPH, THIS WILL STOP YOU FROM DROPPING
TO FIRST GEAR WHICH IS GONNA BE TOUGH ON A NEW DRIVETRAIN.


DON'T FLOOR IT UNTIL IT'S VERY WARM, AKA THE OIL IS UP TO OPERATING TEMP. SO DRIVING FOR AT LEAST 15 MINUTES.


The engine oil installed in the engine at the factory is a
high-quality energy conserving type lubricant. Oil
changes should be consistent with anticipated climate
conditions under which vehicle operations will occur. For
the recommended viscosity and quality grades refer to
“Maintenance Procedures” in “Maintaining Your Vehicle”.
NON-DETERGENT OR STRAIGHT MINERAL
OILS MUST NEVER BE USED.


A new engine may consume some oil during its first few
thousand miles (kilometers) of operation. This should be
considered a normal part of the break-in and not interpreted
as an indication of difficulty.



WITH MY "NEW" CARS/BIKES I CHANGE THE OIL/FILTER AT 250 MILES, 1000 MILES THEN 2500 MILES. FROM THERE IT'S EVERY 5000 MILES USING SYNTHETIC.


ON MY HARLEY I DID 500 MILES TOO, THERE WAS STILL METAL
SHAVINGS WHEN I CHECKED IT AT 500.

AT 1000 MILES IT WAS PRETTY CLEAN, JUST METAL PASTE ON THE MAGNETIC PLUG.


I'm not a mechanic, but i've been wrenching/restoring/building my own vehicles and bikes for 30+years.... this has worked for me.
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  #22  
Old 03-27-2011, 06:09 PM
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Re: What's The Best Way To Break-In the Hemi ??

How can you NOT go faster than 50 MPH during the first 300 miles...it's a HEMI!!! My GC wouldn't let me go slower than 50 MPH on the Interstate....heck it wanted to cruise at 80 MPH.....

What I gather is that you should make sure the RPM's vary more than usual during the first 300 miles and to do some short duration WOT on some highways too to get the full range. Right?
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  #23  
Old 03-27-2011, 06:38 PM
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Re: What's The Best Way To Break-In the Hemi ??

Yahhh its a HEMI = WOT ... Hoo Ya!
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Old 03-27-2011, 06:42 PM
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Re: What's The Best Way To Break-In the Hemi ??

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