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Old 06-08-2004 | 11:49 AM
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DarZeelon
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From: Rosh-HaAyin, ISRAEL
Default RE: Tapered-Bore Engine Break-in - Upgraded

Hi Lior,

After writing the original article in '2fly.co.il' as well as the original thread in this forum, I was convinced that the multiple 10-60 second cycles will do no damage, but will not be better for the engine than just doing several small tanks, 5 minutes each, with cooling in between them.

The 'heat cycling' is imperative for lapped, meehanite (cast iron) piston engines, like some still offered by Fox and by Enya.

But in the high silicon aluminium piston in ABC, AAC, ABN and Plasma Ceramic engines, the heat cycling will achieve very little.
It will do no harm, however, as you noticed in your Rossi.

Even with tapered-bore engines, I do a couple of short runs, before extending the cycles to 5 minutes.