Piston rings

[hillbilly944]

Hey,

Looking to buy a set of piston rings, and found a set for 4 pistons on ebay (WD Express Brand) for a real good price, is this brand any good? Anyone used these with good results?
Sound to good to be true. Thanks
Link below

Engine Piston Ring Set Goetze WD Express Fits 83 88 Porsche 944 2 5L L4 | eBay

[Jrboulder]

1. Be damn sure you know how to work with alusil

2. That looks like it's priced per cylinder

[hillbilly944]

Originally Posted by Jrboulder

1. Be damn sure you know how to work with alusil

2. That looks like it's priced per cylinder

Hey,

Thanks it is for one piston, sorry.

My bores are clean and dull, engine had good compression. Rebuilding because of a rod bearing, so the cylinders should not need any honing. What is the best way to break in the new rings in alusil?

Thanks!

[Jrboulder]

I'd just reuse the old rings

[hillbilly944]

Originally Posted by Jrboulder

I'd just reuse the old rings

180,000 miles, I would like to replace them?

Thanks

[Lapkritis]

You can check the rings to see if they need replacement. The method takes a few minutes once you have all parts including pistons spotlessly clean. Insert the ring into the bore and bring square from the top of the bore using the piston as a tool. Use a feeler gauge set to check the end gap spec (how big is the space at the gap in the ring with the ring installed squarely in the cylinder). I measure at a couple points along the bore as a double-check on the integrity of the cylinder shape. As the ring wears, the gap will open up slightly. If you're in spec, then move to the next test.

Install rings onto piston (note orientation for right side up) and check ringland/piston/ring gap and confirm to spec.

You may find with 180k that your pistons are out of spec slightly especially if things have been ridden hard. The problem this creates are evident at TDC and BDC when the piston acceleration force changes are extreme... if you have a tired piston then the ring can slap around when the acceleration force changes direction and crack the piston. You would notice this as burning oil, sluggish performance, increased blow-by and a crumbly piston on the next dis-assembly.

If everything is good then you're fine to use the rings - sometimes you'll be surprised that they are in spec and do not require replacement. This is one of the times when I would be more prone to use a confirmed in spec, OEM part rather than a new aftermarket.

[9FF]

Quote de Jrboulder

I'd just reuse the old rings

180,000 miles, I would like to replace them?



Thanks

I agree with jrboulder, stick with your old rings. You say your compression numbers are good, from experience they won't be as good with new rings.

[CHICKS]

+1, keep the old rings, don't even pull the pistons.