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New rings?

How much should it cost to have new rings installed in my '87 924S? I just got a chance to tinker after the car sat in the garage for a while, and I'm only getting 60 pounds compression. I'm going to have a leakdown test done, just to be on the safe side. As an update, I did the timing and balance belts, had the head gone over (new exhaust valves), and my timing marks and belt tension are right (Kricket gauge). I've got spark (new coil, plugs, wires, cap and rotor as well), I'm getting fuel, and it doesn't run.
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Old 01-31-2005, 03:45 PM
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EXPENSIVE!!!! You might as well rebuild the engine while you are in there. The pistons have to come out of the top of the block so you open the pan up and disconnect the rods and then take the head off and push the pistons up through the top. Replace the rings and bearings and then install is the opposite of dissassembly.
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Old 01-31-2005, 04:02 PM
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Hmm, you should get about 60psi with no rings...
I think you'll probably find leaky valves.

Even on 60psi, it should sort-of run. It should idle, but make next to no power...

FWIW, my subaru has about 40-80psi on all 4 cylinders (should be 170+), and it still runs, lol, I drive it every day.
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Old 01-31-2005, 04:08 PM
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You have to be careful re-ringing a 944 engine. You should measure the cylinders carefully to see if they are out of round, or the surface of teh cylinders is scratched or scored. (FYI a good cylinder should be a dull grey and smooth as glass - shiny spots are bad)

Based on the condition of your cylinders, then you can make an informed decision about where to go with the motor next.

Definately get a leak down test on the motor. A leakdown can frequently reveal where your problem is:

Example: Cyl #2 has excessive leakdown, 1 & 3 are fine:

Air leak heard through airbox: Problem in intake valve - fix head
Air leak heard through exhaust: Exhaust valve problem - fix head
Air Leak heard through oil filler tube and\or dipstick tube: Piston or cylinder\rings worn or damaged. Teardown engine
Air bubbles noted in coolant reservoir: Head gasket failure or cracked cylinder: Remove head and investigate further.

AFJuvat
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Old 01-31-2005, 09:17 PM
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While th head was off, I inspected the cylinders. All were satin grey, no ridges and perfectly round. I, of course, couldn't get to the very bottom of the holes, as the pistons are in the way, but everything else was perfect.
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Old 02-01-2005, 12:42 PM
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