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Engine building Q:
Posted 05 August 2003 - 01:18 PM
Posted 05 August 2003 - 04:17 PM
Posted 05 August 2003 - 04:20 PM
Posted 05 August 2003 - 05:16 PM
Guest_x silvershad0w x_*
Posted 05 August 2003 - 06:13 PM
Since I was doing a full teardown, I just split the case, and then removed the rods with the pistons in place.
Never install new rings without honing the cylinders first, if you've never honed before use a bottle brush hone in your drill. The three stone hones are nicer for more control, and it makes it easier to spot out of round cylinders, but this is not something to worry about on the Subaru engines as much as others. It is also very easy to take out too much material with the normal hone.
With the higher compression, and since you are just trying to reach higher HP in general, install a new oil pump if you are past 60,000mi on the old one. While to pressure may still look good, the volume i can guarantee you is down, and the bearings will be taking more of a hit with each power stroke, you want as much oil in there as possible.
Posted 06 August 2003 - 01:15 AM
Posted 06 August 2003 - 01:42 AM
Posted 06 August 2003 - 06:20 AM
If an engine has been well maintained, the crosshatch will still be visible even after over 100,000 miles. Those tiny grooves keep the cylinder lubricated, the rings do a pretty good job of scraping oil off of the cyliner walls.
If there is no crosshatch visible, then consider the cylinders worn. Maybe not so worn that a hone and re-ring wouldn't take care of it, but measureable wear nonetheless.
Posted 06 August 2003 - 06:59 AM
EA71 pistons take different rings than EA81 pistons. And if you've never pulled rings off pistons...when you do, you'll find out, you simply can't use them again.
Besides, not using new rings would make that thing smoke like a chimney, even if they would fit.
Posted 06 August 2003 - 12:09 PM
Posted 06 August 2003 - 05:35 PM
Posted 06 August 2003 - 10:17 PM
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