FC3S Murray's never ending build.

WE3RX7 · 08-11-2009, 10:15 AM

My breakin period was always just keep it out of boost up to 4K RPM for the first 100 miles, varying the engine speed (no highways, all back roads, stop and go). Pretty boring part. Then same procedure but revving to 6K until 500 miles (it would sometimes hit small amounts of boost, less than 2psi). After 500 miles I let it boost 6-8psi to 6K RPM. Then from 500 to 1000 miles I keep the boost at 6-8 but take it to 8K RPM... after that its fair game.

Proceding all of that though I would typically have already let the engine run/stop about 4 or 5 times. The initial startup I let it run for a min of 30 minutes provided no issues come up (fuel leaks, coolant leaks, vac leaks etc)...

So my procedure is a little more "risky" I suppose... but then again, I know guys who slap motors together and beat the snot out of them within the first 100 miles, so who knows... it all depends I guess.

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08-11-2009, 10:15 AM	#11
WE3RX7 RCC Addict Join Date: Feb 2008 Location: VA Posts: 1,812 Rep Power: 19	My breakin period was always just keep it out of boost up to 4K RPM for the first 100 miles, varying the engine speed (no highways, all back roads, stop and go). Pretty boring part. Then same procedure but revving to 6K until 500 miles (it would sometimes hit small amounts of boost, less than 2psi). After 500 miles I let it boost 6-8psi to 6K RPM. Then from 500 to 1000 miles I keep the boost at 6-8 but take it to 8K RPM... after that its fair game. Proceding all of that though I would typically have already let the engine run/stop about 4 or 5 times. The initial startup I let it run for a min of 30 minutes provided no issues come up (fuel leaks, coolant leaks, vac leaks etc)... So my procedure is a little more "risky" I suppose... but then again, I know guys who slap motors together and beat the snot out of them within the first 100 miles, so who knows... it all depends I guess.