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Red Herring · 01-03-10, 07:58 PM

I've always been told that running in an engine gently is good for the bottom end, it allows the crankshaft journals to bed in and in the long run last longer. Problem is running in also tends to glaze the bores so the pistons don't seal as well, so potentially give less power. In the perfect world you would run it in nicely, then whip the pistons out, hone the bores and thrash it straight away. Given that as racers we don't live in the perfect world and will probably be rebuilding the engine before the journals need it anyway do what he said...thrash it straight out of the box and enjoy!

01-03-10, 07:58 PM	#3
Red Herring Member Mega Poster Join Date: Dec 2007 Posts: 2,708	Re: Running in a rebuilt engine. I've always been told that running in an engine gently is good for the bottom end, it allows the crankshaft journals to bed in and in the long run last longer. Problem is running in also tends to glaze the bores so the pistons don't seal as well, so potentially give less power. In the perfect world you would run it in nicely, then whip the pistons out, hone the bores and thrash it straight away. Given that as racers we don't live in the perfect world and will probably be rebuilding the engine before the journals need it anyway do what he said...thrash it straight out of the box and enjoy!