Originally posted by NitroOB4You
I appreciate the input, but Im not really looking to start a "Is this engine better than the rest" type thread. Id really be interested in your break in procedures. I have gotten some response in another thread, and if Im understanding this correctly, this guy removed all head shims and ran it in with 25 % and a high oil content fuel. Just wondering if others have similar history or if there's other suggestions.
NOOOO!!!!!!
Remember that you mainly want to heat cycle the motor and let the components settle to the running conditions. What this means is run the motor in with the same fuel you intend to run the motor on. Run it very rich for about a minute, then stop the motor and let it cool completely, do this for 2 tanks, stopping the motor after a minute and letting it cool completely. Then run it a little leaner, the same way you did previously. You may want to run the motor in the car on a bench with a fan, letting the motor idle. After you have leaned the motor on the 3rd and 4th tanks, Lean it to slightly rich, then run the 5th and 6th tanks. now the car is nearly ready, take the car and run it at MAX 1/2 throttle, but cycle the speed up and down, but stop every minute and let it coll completely, do this for one tank. Once this is complete, with the motor rich, run it to full throttle and down to 1/4 throttle, cycle this for a minute, try to get at least ten cycles in the minute, stop and let it cool, do this for a tank. You can now set the car up to race tuning and run it as you need.
You dont necessarily need to follow this, but I can tell you the you will get many great hours out of your motor. AND your motor will be easier to tune, and will make BIG power.
Regards...
Let me know how it runs.
This procedure will also work on a bench with a prop, in fact it is better on a bench, but break-in benches are in excess of $100.