Max rpm during break-in?
 

Break-in duration:Book says 1000, dealer said 500, who's right?


CZ


2003 C230K Sport Sedan

I don't know what book you're reading, but my operator's manual says that max rpm's during break in is 4000 rpm.

1000??? that's barely accelerating... my manual says 4000 also

I think he means break-in miles not rpm.

I'd go with the manual (1000 miles and 4000 rpm).

Cheers, BT

hehe, I meant miles
 

I'll got with 1K

Thanks guys

ok that makes more sense :D... I was about to say... 1000 rpm doh!!

My dealer in San Antonio told me to not eve wory about breaking it in. I completely ignored that and waited till I hit 1000 miles to take it past 4000rpm. In the long run it's better for you, or whoever ends up with your car. Enjoy!

Break in sets up the wear pattern for the engine. If you only go to 4000rpm then you are going to not get max power out of the last 2000 rpm due to established wear patterns. Rev the engine over the entire rev band but never floor it or 'lug' the engine for the first 1k miles. Do not drive at a constant speed either, move up and down the rev band. This ensures your car will be optimal across the entire range. I have seen the benifits of this on many engines I've had and/or built over the years. Try it, you'll like it!

That's pretty much exactly what I was told by my buddy who's been an MB mechanic for over 20 years....

I take his word over any book or sales guy.

Yup,

When I bought my coupe it had 42 miles on it. When I drove off the lot it was instantly taken to redline in 1st, 2nd, and 3rd, on its way to a lovely speed of 120 on the interstate. Never a problem yet out of the engine.

Yes the important thing is not driving at a constant speed... vary it up and push the car through the whole rev band... just don't floor it...

what the heck just floor it!
 

unless you want to keep the car past your the waranty period then be a little cautious.

Okay whats your VIN#? I'll be sure to let ppl. know NOT to buy that particular coupe :D :D :D seriously its not really got to push the engine with 42miles. The best RPM to be in during break in period is 3259rpm and 678 miles.....why? b/c i said so :p :p :p go with the guy with all range all speed "nicely" deal...

I believe in a semi-hard brake in, I have done it on plenty of motors with good results. I can explain if you want.

Do tell.:)

http://www.mototuneusa.com/break_in_secrets.htm

IT is easier to just read the linked page. I do not follow it 100%. I just get on it everyonce in a while, you know, like every day punch it, blow out the cobwebs. I think this works best for longevity and loosening things up when it is new.

Among other things, that page says

"If you think about it, the ring exerts maybe 5-10 lbs of spring tension against the cylinder wall ...
How can that small amount of spring tension seal against thousands of pounds of
combustion pressure on the way down ??
Of course it can't. "

This guy's conclusions might be correct, but if so, he arrived at them by chance, not by reason. His understanding of physics is clearly faulty: in this case he is trying to compare two vector forces operating at right angles to each other by simply comparing magnitude of force.

I'm hesitant to believe him.