Originally Posted by
sammies
hmmmm...
to break in the engine, i idled it on the box for 3 tanks. then on track for a further 3 tanks, and leaning top end thereafter.
Race tuning only started about the 10th tank or so.
I was using Mecca fuel with 25% nitro content. it does not state the % of castor, but some pple who also uses it at my local track rates the castor % at approxiamtely 12%.
The worst thing you can do to a new engine is to let it idle like that during the break in process. The rod was put under enormous stress when the engine was run too cold. You must make sure you get the engine up to temperature as soon possible and maintain that temp. I would advice you do a search on heat cycling during the break-in process. When running a new engine in, more damage is done when the engine is below 80 degrees then if it was running at 130 degrees plus. After breaking in an engine, I would replace the original rod after no more then 3 litres.