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Old 05-23-2016, 03:22 PM   #1
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Zetec Break-in procedure

Due to a loss of oil pressure within the motor we had intended to run, we have sent out or spare block to turn into our primary. I have not seen the list of everything that has been done to the spare block but I am going to assume it is similar to what was done to the one we melted down. That list is as follows:

Block trued
Cylinders trued
New pistons, rings, bearings
New crankshaft bearings

Existing modifications:

Head shaved .030"
Crane Stg II cams
Straighterish intake.
Stock exhaust manifold into 2.5" pipe. Only resistant on pipe is a 2.5" resonator at the very end
Oil cooler

What I am after is what do we need to do to break this in so that it will last for a long as technically possible. The last motor saw nothing above 5000 RPM and ran for less than an hour before it had its oil issue. We went mild on a lot of these changes because this car is being used in endurance racing. If we make it all, we have 18 hours of track time ahead of us this weekend. I would like to be able to do as well as possible. At the same time though I want to set this thing up for the long haul.

We have 4 hours of practice on Friday so if this can be done in that amount of time and we can turn it loose for the weekend, I would very much prefer to do that. I have done some looking on here about break in and for road cars I have found varying the load and not running full out, for 500 miles. While we are likely to see that distance this weekend, and varying the load shouldn't be an issue, not running full throttle is going to get us run over.

TL;DR, is there a racetrack break in for a rebuilt Zetec engine?


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Old 05-23-2016, 10:43 PM   #2
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I think any engine builder who did your assembly should be able to recommend what they want. High zinc content break in oil, run up to temp and shut down, recheck head torque and do it again, ensure good cooling and run for 15-30 min checking a/f info, put a load on the engine. Let it cool down pull the filter and cut it open for inspection. Change oil to your builders recommend viscosity and go have fun.
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Old 05-24-2016, 10:15 AM   #3
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You would think.

Just found out they dropped one of our new cams, dented and cracked it, put it back, and didn't tell any of us. Needless to say we are never going back.

Any idea of a reputable shop, Zetec specialist or not, in the SE Michigan area? If we need any more work done I'd like to have a couple of names on hand.
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Old 05-26-2016, 09:31 AM   #4
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Loose the oil cooler , they cause more harm then good

Next thing you need is a tune

No one has rebuilt more Zetec engines then we have , let me know if I can help

Tom
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Old 05-26-2016, 10:36 AM   #5
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Everything I have read says these cars have issues with overheating the oil when run hard. Is that not the case? We endurance race this car so it runs hard for 7-14 hours at a time.
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