Break-in overhauled engine
 

Hi guys,

Tomorrow is the day!! Finally my car is finished, engine is rebuild and put back into the car again and tomorrow I can pick it up!!! Hope that the weather stays as fine as it is at the moment here in Holland! (anything but rain will do!).

Only thing is that I have to break in the engine for some 3000 ~ 5000 km's. Can anybody give me some advise on how to break in an engine?

THanks a bunch!

Oh by the way this is my engine just before it goes into the car!
http://www.pelicanparts.com/ultimate...sm_1_small.JPG




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Joris
75 911S
http://www.angelfire.com/bc3/joogie/index.htm

why don't you put some high temp paint on the muffler before you put the engine back in?

oh, maybe you can't it would get too hot?

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Daryl Planter 91C2
Targa

[This message has been edited by Sportsman (edited 10-18-2001).]

The basic thing to remember in breaking in an engine is that high piston pressure is worse than high rpms. In other words, worrying about keeping the car under 2,500 or 3,000 while accelerating with strong throttle pressure is worse than winding the engine to 4,000 or 4,500 while driving as though you're stepping on a raw egg. It's also worse to over-baby an engine during break-in; you need to vary engine speed and throttle opening. If you drive for 1,000 miles at 2,500 rpm without ever accelerating moderately, your engine will never break in. Basically, you need to go through a program of starting out the break-in mileage relatively gently but soon start making the engine do a little work, then a little more work, making it go through various regimes of rpms and throttle pressure, fairly frequently varying them. And above all, worry about flooring the throttle, not about whether you tak ethe engine to 5,000. After all, one of teh first things you need to do is set up the distributor timing, and on my engine, this required me to run it at 6,000 rpm for a few moments before the car was ever on the road. Didn't hurt it a bit.

Oh, and consider a couple of early oil changes. I changed my oil and filter after the first 20 minutes of running (on jackstands at about 2,500 rpms, as I remember, to break in the cams) and then again at 500 miles and 1,500 miles, examining the filter at each change.

Stephan

Many years ago, a local engine builder/tuner said he drove the cars down to San Diego varying the RPMS on the freeway to break-in his motors. What a job eh?

This was from LA to San Diego and back again.
~ 400 miles I think. He said the break should be around 500 - 1000 miles, with NO hard acceleration.

Have fun

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Nick Hromyak
'85 Carrera 7 & 9 Fuchs
Havin' Fun in Sacramento

Looks good Joris!!

BTW do you have a pop-off valve in the airbox?

Joris,

Take a look at the following thread for berak-in info:

http://www.pelicanparts.com/ultimate/Forum3/HTML/013347.html

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Warren Hall
1973 911S Targa
1992 Dodge Dakota 5.2 4X4 parts hauler

Thanks guys for the info,

Just got called by the workshop,... my 911 is waiting for it's owner to take it home!! And that after 2 months. God, I can't wait, have to wait until 13.00 hours and have decided to definately take the afternoon of to drive the car!!!

No popup valve installed, talked to the guys at the workshop and they gave me a kind of empty look, even had to explain the pop-up valve theory. Of course they had seen some broken airboxes, but gave me the answer that if the car is properly setup it doesn't have to happen! Well I don't know and I don't wanna think about it, gonna drive it!!
http://www.pelicanparts.com/support/smileys/happy.gif


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Joris
75 911S
http://www.angelfire.com/bc3/joogie/index.htm

[This message has been edited by jorisg (edited 10-19-2001).]

Oh by the way....

It's back and I love it!!

http://www.pelicanparts.com/ultimate...backsmall2.JPG
Just picked up my 911 this afternoon and am thrilled, engine feels absolutely very nice and smooth. Can't really do anything of course since I am still breaking the engine in (and will do that for quite some time).

Any way it is good to have her back in the garage!

Oh and they even put the engine back in!!

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Joris
75 911S
http://www.angelfire.com/bc3/joogie/index.htm

[This message has been edited by jorisg (edited 10-19-2001).]