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Old 04-27-2001, 07:45 AM   #1
bryanw
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Member#: 807
Join Date: Jan 2000
Location: Greenville, SC
Vehicle:
2002 WRX Wagon
Black

Post Factory worn engine?

I just read the good explanation about how and why an engine breaks in: http://www.i-club.com/ubb-files/Foru.../022071-2.html

I'm wondering why if every engine has to go through this break-in period where you have to drive it softly and everything, why the manufacturer just doesn't make that part of the production process? Why can't they just run the engines hot in the factory for 500 miles and break them in perfectly (I'm sure they could figure out the best way to do it), then drop them in the cars and ship them out?

It just doesn't make any sense to send out a product that's really partially complete, giving the consumer the chance to mess it up in the final stage of production (break-in).
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Old 04-27-2001, 07:51 AM   #2
ColinL
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Member#: 114
Join Date: Jul 1999
Chapter/Region: MWSOC
Location: Wichita, KS and Whoring, OT
Vehicle:
'03 Evo, Rice White
'01 Erion CBR 929

Post

Um, cost. That was easy... next?
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Old 04-27-2001, 07:57 AM   #3
Poseidon
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Member#: 4864
Join Date: Mar 2001
Location: North Bend, WA USA
Vehicle:
2004 WRX
Silver

Wink

Ever wonder why a Porsche costs so much?

Jordan
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Old 04-27-2001, 07:02 PM   #4
pottsie350
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Member#: 6110
Join Date: Apr 2001
Location: Lonaconing, MD USA
Vehicle:
98 Impreza L
Red

Default

Good explanation.. Garsh.. Thanks

Cost is definitly a reason. Does porsche break in their engines? That's cool if they do, I wasn't aware of that.

One thing I have read about is that since people have different driving habits the engines will wear specifically to the way the engine is driven. I'm not sure about the technical details, since I've never experienced poor engine break in, (knock on wood) but I've read examples of people who have bought cars from gentle drivers, you know... people who never aproach redline, (makes me shiver just thinking about it), and they immediately pop in a big cam, huge carb, big blower, etc. Well once they do that the thing doesn't run with near the potential that it should.

They are baffled, and upon tearing the engine apart to see what is wrong they find the rings aren't even scuffed in. The engine ran fine for the gentle driver, because the rings were worn sufficiently during break in to handle the mild pressure, but once joe motor head gets it and tries to put the squeeze on it they just blow all kinds of exhaust gas by.

I've always condoned the use of full throttle during breakin.. but only for very short bursts. Especially during the first 200 miles. Very gentle for the first 100, then varying 5 to 20 second full throttle bursts to about 4 grand till 200 miles, add another 5 to 20 seconds for every hundred miles after that till you reach a thousand miles. Then it's a free for all... wooo hooo.. don't forget to change your oil after 1500 miles to get rid of all those microspic chunks of metal.

By the way my wifes Legacy just passed 1000 miles.. It feels GOOD to wind it up now. Gotta get some AGXs and a rear sway bar for it soon.
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