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Breaking in a fresly rebuilt engine on a track car?

Old 04-27-07, 01:50 PM
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Breaking in a fresly rebuilt engine on a track car?

What is the established way to break in a newly rebuilt 13B-REW on a non-road-legal car?

I'm getting more and more info together on my race car for this summers work on it, and one thing that is bothering me is that I can't take the car on the road to break it in.

I could probobly get some time on a track or large parking lot and run it arround there for a while, but there is a limit on how many miles I could get in without being able to take it on a long straight stretch and let it run 70.

What are people doing for their race motors?
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Old 04-27-07, 01:55 PM
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fist, when breakign in an engine you dont want to run a constant speed for long. If you do itl be broke in for that speed and may not seat properly for the rest of the rpm range. For that reason your parking lot or track time is actaully a good idea.
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Old 04-27-07, 02:39 PM
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Assuming this old-bearing break-in schedule
http://www.mazdamotorsports.com/weba...1&subject=misc .
If you have access to a track that has open-track sessions, you can get it done in 4 20-minute sessions.
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Old 04-27-07, 03:02 PM
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That page is awesome info, thanks for the link!

I don't know about open track days on a road course, but I am staff with the local drift assosciation, so I'll have to see about running their cone course one evening before an event for a few hours. Between me and my partner we ought to be able to put some miles on the car that way.

It would be rather "hick" but we also have access to a lot of farmers dirt roads and pastures out at my partner's grandparent's ranch, so we could break it in running it arround out there. It would have to be before the new suspension was installed though :p I think I would prefer to run it at the track.
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Old 04-27-07, 08:13 PM
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most all raod courses have test-n-tune nights. It will be between $50-100 and depending how they organize it and how many people show up you could potentially run all night (hours) just doing cold laps. That is what I would do personally.
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Old 04-29-07, 01:26 PM
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back in the old pro7 days we used to put em in the parking lot @fast idle for 45minutes to an hour with a big fan in front of em.

with the its car, we'd idle it for a while, and then take it out in group1, for a few easy laps
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Old 04-30-07, 11:00 AM
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Talking

What I have done with my last 2 race motors is rent a local oval track for an afternoon. Local to me is a 3rd mile oval where I can get up to about 80 mph on the straights and carry about 45 - 50 through the turns. I start out lapping using the Mazda speed rpm and load recommendations. It is very hard initially to not go toooo fast..... Later I pick up RPM and drop down gears. Final session is usually in 2nd gear winding the poop out of the car to get up to 7500+ RPM.

It works great as there is only momentary or short duration loads on the car. If you have any issues you can quickly pull into your pit area. There are usually no noise issues. Your crew can watch the car for any leaks or other problems. One issue is with engine temps in the final section as you are using high rpm without a lot of track speed (we were using second gear). I needed to run with my electric fan on.

I spoke very nicely to the track owner on the phone and presented ourselves as a responsible team. So we showed up with the whole set-up (truck/ trailer/ support setup and crew) acted responsibly and he was great with us. He let us in to the trackwatched for a while then went for lunch. Later in the day when we were finished he even ended up coming over and looked the car over. The whole track rental was $100.00 Cdn. Great guy and a very good solution.

Best thing was when he came over he said we were turning Late Model times and would we be interested in trying to organise a race day at the oval for our series.

Just an idea that many people don't think of.

Eric
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