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Old 05-10-2006, 05:55 AM
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tex1
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Post Engine method

I discussed this with a college professor that supervises a formula type race team.
He said break-in only has a few key elements.
1. Do not idle the engine. Get it rolling soon. Just putt around and don't load the motor.
NOTE - You need to have the idle set correctly. Most engines come way rich. Use the top needle to get to temp. Keep in mind the piston and the sleeve are different materials and will not expand correctly until they have reached a certain temperature.
Get to 200 degrees as fast as possible and keep it there. Run the car for 3 or so tanks to allow the parts to lap in. Keep the motor running for this entire process using very short blips of the throttle. Don't turn the motor off and don't get on the gas hard.

2. After a cool down (10 minutes after the motor temps less than 90 degrees) run the car using 1/2 second throttle inputs. The motor should not be comming up on the pipe. Keep the motor between 200 and 230 degrees using the top needle only. Turn the motor off after each tank and let it cool using the rule from above. Repeat this until you have run at least 3 tanks this way.

3. Change the motor input to 3/4 second throttle inputs following the same guidelines for step 2. Make sure the car is smoking properly and only use the high needle.

After step three is completed you should have at least nine tanks on your motor and you are ready for an idle setup and tune. You should be ready to get the motor up on the pipe now.

Hope this helps,
TEX
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