I'll go with what the MANUFACTURE says, tyvm.
This is a discussion on New engine break-in technique within the Dodge Dart General Discussion forums, part of the Dodge Dart Forum - Dodge Dart Discussion category; Feel free to yell at me if there is a specific thread about this, I could not find one with searches - just related posts. ...
Feel free to yell at me if there is a specific thread about this, I could not find one with searches - just related posts.
What is everyone's opinion regarding breaking in new engines. Follow the book (gentle), or the rough way (high-revving city driving)? An example of the latter. This guys theory seems to be quite popular as a quick google search on the topic will show you. I would still be scared to do it . What do you think?
I am doing this now. From the manual:
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 detri- mental and should be avoided.
Brief full-throttle is fun......
The link you've provided is the EXACT method I've used in the past on a motor I've built. After breaking in that engine it had 207psi across the board on its compression numbers. Brand new factory spec compression on that motor was 195psi. It took close to 2000 miles to reach full compression.
I'll be using the same break in method on the Dart when I finally take delivery of it.
Here is what I typically do with my cars, especially ones where I have built the motor and it works out great.
1. Like the manual says, no hard launches for the first 500 miles. Please let your car warm up to operating temp first before going out to do this.
2. During the first 500 miles, take it on the highway and from 3rd gear do WOT runs to the posted speed limit(your on your own if you want to go past that) and let off the throttle and coast until you drop back down into 3rd gear and do it over again. The more you do this during the first 500 miles the better the rings will seat. (You want to downshift to take advantage of engine braking)
3. Drive normally around town during the first 500 miles, dont stoplight race or do low speed WOT runs.
4. After 500 miles or so, drive how ever you want(legally).
I just drive it like I stole it off the lot...it has a warranty!
Moparian is dead on.
But to be truthful your engine is as broke in as it needs to be as soon as it hits the dealer lot. At the factory they idle a few min for inspection then its a WOT shot down the line and parked. Then your dealer for inspection does a WOT pull. I prefer that live or die method. One heat cycle. Then a few wot pulls. Live or die. Its how we break in our race engines.