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Yeah, that's a bit of a tough sell given the TSB about replacing 1R rods with 2R rods, but OTOH there are plenty of '93 and early '94 GTSs that have been running around with 1R rods without ill effect for 25+ years. But those owners don't need replacement rods either....
Yeah, that's a bit of a tough sell given the TSB about replacing 1R rods with 2R rods, but OTOH there are plenty of '93 and early '94 GTSs that have been running around with 1R rods without ill effect for 25+ years. But those owners don't need replacement rods either....
I don't have the TSB, but my recollection was it was if you already have the engine apart you should replace the the connecting rods or words to that effect. There was no recall to replace them.
my recollection was it was if you already have the engine apart you should replace the the connecting rods or words to that effect. There was no recall to replace them.
Correct, here's the TSB for posterity. No recall, that would involve Porsche admitting a mistake.
Do we know of any actual failures? Bent rods, etc.
I ask only because the first 93 GTS I owned was 'poorly' supercharged. The PO had shipped the GTS to be supercharged by Munck. The story I got was he over-pressurized the cylinders. Owner had to buy a replacement engine (A/T) from Mark.
Had DR restore it stock back in 2004 after picking it up on I40 and driving it up to Spruce Pine.
What I heard was that the cylinders were ovaled. There was no mention of bent rods. I know less about supercharging than I know about stroking.
But, if what I is told was correct wouldn't you expect the rods to bend before the cylinder would be misshapen?
While I am no expert on TSB's or the various connecting rods I think that the important phrase in the TSB is that the rods should be replaced one the rod nuts have been loosened.
While there are many GTS's running around without issue and having these rods in place perhaps the problem with them only occurs once they have been re-used. (Rod nuts loosened).
Pure speculation, but perhaps Porsche was seeing failures in engines that had remedial works to try to deal with excessive oil consumption involving piston / rod removal.
^^^^^^^^^^That was my '93 GTS motor that did have 1R rods. But if you look at the rod bolt threads you'll note they're intact (though rolled over a bit...). Which means that the rod nuts backed off, either from being undertorqued or re-used. I don't think 2R rods would have been any different in this situation.
Not to jinx myself but I have 179,000 miles on my early '93 GTS. I replaced the rod bearings with new ones at about 120,000 miles and used new nuts. So far so good...
07-08-2022, 02:53 PM
FS: GTS Connecting Rods R1
