I am breaking in my engine right now and I have heard many opinions about how many miles or hours to put on an engine before it should see boost or high rpm.
Tell me what you think...

 

1000 miles no boost
1000-1500 miles 1/2 boost
1500-2000 slowly approach full boost
change oil at 500 and 2000 miles

 

I have been told 1000 miles without boost, then slowly to full boost after that up to 1500 miles or so...
Any other opinions?

 

Follow the engine builder's break-in schedule to keep your warranty, if you rebuilt the engine then do whatever you want. We have built race only engines that we have heat cycled a few times changed the oil and put directly on the dyno taking it to 9k rpm without any miles at all, since the car can never be taken on the street.

You already got someone that gave you a decent recommendation, what are you looking for someone to tell you it is OK to do less? That way when you blow it up it is not your fault?

Opinions differ greatly on this issue. Different apex seal manufactures suggest different lengths of break-in, based off the softness of the material used. Refer to your builder or the seal manufacturer.

 

^Ditto...if it's someone else's motor, break it in their way for the sake of both yours and their happiness.

Me, however...I drive them like I plan to always. I've always worked off the premise that if you have a good tune, it won't matter. Just follow reasonable warm-up proceedures.

 

12AllWays, please don't post and then bump you post an hour later with an exasperated line about how no one has replied. 1 hour is only 60 minutes. As surprising as it may seem, this forum is not staffed 24 hours a day with people who sit on the edge of their chair waiting for your post.

Now, about the question. Breakin is one of those things that varies between builders. You can ask 5 builders and get 6 different replies. My personal method is to drive the engine for 500 miles easily after breakin, then start beating on it and tuning in boost.

 

Wow you people need to lighten up. I was just looking for opinions, I did not ask for guidance. I rebuilt the engine myself and I will break it in however I feel nomatter what others say.
Aaron you are the last person I expected to hear **** from. I was replying to the first guy that replied to my post. But I guess thats my bad.

As stated before... Any other opinions? or experiences with breaking in one?
Keith

 

i would like to know aswell

i was told to keep it under 5000rpm for the first 1000miles
and on initial start up at least 30mins before driveing

 

Did you reuse the housings and a lot of the seals and springs? IMO the more new parts you have the quicker it will build compression and the less break-in will be needed, up to a point at least. Think about all the salesmen and mechanics who beat the **** out of your original engine back in 1987 or whenever with 20 miles on the clock.

 

for me for instince i have new housings new bearings and seals etc i thought i would expect a longer break in for the bearings.

and i am guessing these miles people talk about are city stop and go traffic as you want the motor to experince lots of rpm change..

 

I am running low mileage housings and Irons. All new seals/springs and good used rotors with good bearings not new. Hell I had 70-80 psi on all faces before initial start up. But I am still going with at least 1000 miles easy driving to be safe. I hear ya, I have seen many salesman beat the hell out of RX8's so I'm sure it was the same 20 years ago.