964 Prices
03-24-2023, 10:29 AM
#2161
Pro
03-24-2023, 11:33 AM
#2162
Rennlist Member
I have a ringless motor with a found broken stud on cylinder 3. IMO I'd rather the ringless motor as I'm still gonna use the car for the foreseeable future (obviously not beating on it), as my feelings are there's 4 studs per cylinder, this is the middle (which is also odd why middle cylinders break, maybe heat??) and worst case, if there was some movement, you don't have to worry about a ring moving and smashing things on the heads/jugs.....Though at that point I'm sure it would make some noise... It also makes me feel better until I can swallow the cost of having to build a new piece. I've already picked up some Xtreme cylinder heads, hoping to pair w/ some 3.8 pistons/jugs, and custom cams. Weird though they don't rely on a gasket at all, although it is naturally aspirated too so no real worry of lifting the heads I guess.
I had a very nice early engine that was modified heavily. They machined the heads and the tops of the cylinders to increase compression. They cut the crush rings into the cylinders and used 993TT/cup car threaded head studs. Power was better than most simple 3.8 conversions at 272hp and 269 ft pounds tq. The issue with the early heads is they would warp and that would cause the head studs to break. They changed the design to preclude this so there is no concern with the revised engines. I have seen the later engines go 300k miles without issues other than worn valves and guides.
Also Cylinder # 5 is what I find has most issues on all these engines. It is sandwiched between the others and the reason Porsche used the flat fan for the race engines is to better circulate the air. the rear mounted fan doesn't do as well cooling the inner cylinders.
The day my 928 GTS arrived it blew one of the coolant hoses. The seller, the late Michael Willhoit paid for all the coolant hoses to be replaced and sent me a check for $250 to take my wife out to dinner for the inconvenience. he also said drive it for a month and if i wasn't satisfied he would take it back just pay to have it return shipped.
A good salesman should always be willing to stand behind their product.
Last edited by cobalt; 03-24-2023 at 11:36 AM.
03-24-2023, 05:33 PM
#2163
I have never seen or heard of the later engines having broken head studs. This is a problem on the earlier engines. They redesigned the heads and changed the alloy when they improved the engines.
I had a very nice early engine that was modified heavily. They machined the heads and the tops of the cylinders to increase compression. They cut the crush rings into the cylinders and used 993TT/cup car threaded head studs. Power was better than most simple 3.8 conversions at 272hp and 269 ft pounds tq. The issue with the early heads is they would warp and that would cause the head studs to break. They changed the design to preclude this so there is no concern with the revised engines. I have seen the later engines go 300k miles without issues other than worn valves and guides.
Also Cylinder # 5 is what I find has most issues on all these engines. It is sandwiched between the others and the reason Porsche used the flat fan for the race engines is to better circulate the air. the rear mounted fan doesn't do as well cooling the inner cylinders.
The day my 928 GTS arrived it blew one of the coolant hoses. The seller, the late Michael Willhoit paid for all the coolant hoses to be replaced and sent me a check for $250 to take my wife out to dinner for the inconvenience. he also said drive it for a month and if i wasn't satisfied he would take it back just pay to have it return shipped.
A good salesman should always be willing to stand behind their product.
I had a very nice early engine that was modified heavily. They machined the heads and the tops of the cylinders to increase compression. They cut the crush rings into the cylinders and used 993TT/cup car threaded head studs. Power was better than most simple 3.8 conversions at 272hp and 269 ft pounds tq. The issue with the early heads is they would warp and that would cause the head studs to break. They changed the design to preclude this so there is no concern with the revised engines. I have seen the later engines go 300k miles without issues other than worn valves and guides.
Also Cylinder # 5 is what I find has most issues on all these engines. It is sandwiched between the others and the reason Porsche used the flat fan for the race engines is to better circulate the air. the rear mounted fan doesn't do as well cooling the inner cylinders.
The day my 928 GTS arrived it blew one of the coolant hoses. The seller, the late Michael Willhoit paid for all the coolant hoses to be replaced and sent me a check for $250 to take my wife out to dinner for the inconvenience. he also said drive it for a month and if i wasn't satisfied he would take it back just pay to have it return shipped.
A good salesman should always be willing to stand behind their product.
03-27-2023, 09:46 AM
#2164
Rennlist Member
Yep had to have known. Usually you can tell if a head stud is broken by listening for the broken part rattling around while running. I had 4 on my 90 engine. Foolishly back in 2015 they weren't worth anything and I sold a complete engine for $3k.
Today that same engine can bring $15k or more. Crazy.
03-27-2023, 09:51 AM
#2165
Yep had to have known. Usually you can tell if a head stud is broken by listening for the broken part rattling around while running. I had 4 on my 90 engine. Foolishly back in 2015 they weren't worth anything and I sold a complete engine for $3k. Today that same engine can bring $15k or more. Crazy.
Today that same engine can bring $15k or more. Crazy.
03-27-2023, 10:00 AM
#2166
Rennlist Member
03-27-2023, 01:34 PM
#2167
Rennlist Member
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03-27-2023, 05:09 PM
#2170
Rennlist Member
Wow, RNM on the white one at $135k...
03-27-2023, 05:28 PM
#2171
Rennlist Member
Wild.. I feel like that was a good price, considering it was a early model C4.
Looking through his receipts he spent 24k on that interior + those Augment wheels. Guessing he thought he would see that investment back and then some.
In reality, Cup1's would have probably been more desirable and the interior, while cool, is just way too custom and if i'm being picky I can spot some poor areas from the pics.
Looking through his receipts he spent 24k on that interior + those Augment wheels. Guessing he thought he would see that investment back and then some.
In reality, Cup1's would have probably been more desirable and the interior, while cool, is just way too custom and if i'm being picky I can spot some poor areas from the pics.
03-27-2023, 05:37 PM
#2172
Rennlist Member
I feel like $100k was too much for that car but clearly I know nothing, haha.
03-27-2023, 05:40 PM
#2173
Rennlist Member
135 was solid. The listing said he's only put 100miles since ownership, so I'm guessing he bought it and dressed it up just to flip.
he would have been better served with an OEM interior, custom recaro's and Cup1s.
03-27-2023, 06:02 PM
#2174
Rennlist Member
I've been watching the market really closely and i figured it would go in the 125-145 rage.. the main holdback being a C4 vs C2 and it hasn't had a total engine rebuild.
135 was solid. The listing said he's only put 100miles since ownership, so I'm guessing he bought it and dressed it up just to flip.
he would have been better served with an OEM interior, custom recaro's and Cup1s.
135 was solid. The listing said he's only put 100miles since ownership, so I'm guessing he bought it and dressed it up just to flip.
he would have been better served with an OEM interior, custom recaro's and Cup1s.