Thread: 4A-GE MK1 Engine how long does it take to break in?
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Old 10-22-2008, 09:05 PM   #3 (permalink)
328FTW
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Depends on a lot of things but if you did rings and bearings I would say the equivilent of a couple longish drives would settle it down although for the engine to truely settle will take a bit longer probably a couple thousand k. It is not much of an issue as long as you give it a good run the first time to settle in the head gasket. It may smoke a little bit as the rings settle in but it goes away.

As long as the bores are honed it's all good. I took some bad advice once from an engine builder saying little jap engines don't need honing and the rings will settle in the glazed bore and I now have to tear the engine down to hone the bores cause after 2000 km it is smoking really bad and the oil is heating up from blowby gases. I think that not honing applies to wet bore engines (really hard bores) not the cast blocks that the 4age uses.
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