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Tear Down almost done - pictures.
It's analysis and recommendation time.
I'll post these pictures and let them confirm the story. Dropped #1 exhaust valve. 1975 911S 991/44 engine (CA) 54K mi on car, some evidence of engine work on the way in, like sealant behind L timing chain case. I drove 80 miles with the piston like that. Felt rough but I needed to get home.... ![]() The only nugget I found in the case - lots of others at the strainer. ![]() Does this case already have timecerts? To me it looks like it - I'd be surprised. ![]() ![]() ![]() ![]() Let your opinions and suggestions fly. Particularly a good Machine shop w/i driving distance to Redding CA.
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75 911S Targa - Mine from 2001 until sold to Germany buyer 10/2016 <ALL DIY> Brakes/Wheels '01, Body/paint/restoration 7/04, Suspension 3/07 Engine rebuild - done 7/08 - added 28 tube cooler and SSIs - running strong. Ducktail painted. 2021 MachE, 2012 Outback, 2019 Crosstrek, 2018 Impreza wagon |
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MBruns for President
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Buy a 3.0
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Current Whip: - 2003 996 Twin Turbo - 39K miles - Lapis Blue/Grey Past: 1974 IROC (3.6) , 1987 Cabriolet (3.4) , 1990 C2 Targa, 1989 S2 |
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3 restos WIP = psycho
Join Date: Feb 2005
Location: North of Exit 17
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A bit glib, but this is great advice if you aren't married to the idea of a 2.7. They are perhaps the most bulletproof engine Porsche ever built and make wicked power.
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- 1965 911 - 1969 911S - 1980 911SC Targa - 1979 930 |
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Magnus 911 Silver Targa -77, 3.2 -84 with custom ITBs and EFI. 911T Coupe -69, 3.6, G50, "RSR", track day. 924 -79 Rat Rod EFI/Turbo 375whp@1.85bar. 931 -79 under total restoration. Last edited by safe; 02-18-2008 at 10:48 AM.. |
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I have almost two 2.7 engines worth of parts. One has been in the family and in the car for 33 years and only 54,000 miles. I'd rather rebuild a known engine than take my chances on what I can find on the market. I recognize the structural problems with the magnesium case which for the most part can be dealt with. A valve job will be more expensive to the tune of the valve guide replacement.
I agree that the letf crank journal in that picture looks scratched, grooved or otherwise worn. Its a good picture because my naked eye and finger didn't detect it. Maybe it will "buff out" with a polishing.... Any opinions on the head studs?? - are they timecerted already?? I did some kerosene case cleaning today so a cleaner picture can be taken.
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75 911S Targa - Mine from 2001 until sold to Germany buyer 10/2016 <ALL DIY> Brakes/Wheels '01, Body/paint/restoration 7/04, Suspension 3/07 Engine rebuild - done 7/08 - added 28 tube cooler and SSIs - running strong. Ducktail painted. 2021 MachE, 2012 Outback, 2019 Crosstrek, 2018 Impreza wagon |
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I was not clear if mine had been done either. So I had the machine shop tear it down and inspect it and it turns out that they were not previously done on my 2.7. Have you thought about sending all of the parts to a shop to have them inspected, cleaned, machined and reassembled?
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MBruns for President
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Hey I would rather rebuild my own than deal with an unknown too - but if I had a 2.7 - I'd look for a nice 3.0 or 3.2 to rebuild. By the time you do the machining - by the time you get that crank polished and magnafluxed - by the time you replace the engine oil cooler and rebuild your oil pump (or better yet, replace) you'll be in 3.X territory.
Sorry for the "glib" reply - but that's what I would do.
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Current Whip: - 2003 996 Twin Turbo - 39K miles - Lapis Blue/Grey Past: 1974 IROC (3.6) , 1987 Cabriolet (3.4) , 1990 C2 Targa, 1989 S2 |
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Capitalist and Patriot
Join Date: Sep 2006
Location: Freedomville
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PM sent "notmytarga" I'm local if you need anything shoot me an email, I've got a really good mechanic up here in our neck of the woods...
IMO i'd say compared to other pics in rebuid books it doesn't look like all the certs have been done yet... Good luck, Jason
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Former Test driver & Production Manager Singer Vehicle Design 2009 Cayenne GTS, '81 911SC RoW Targa (lot's of goodies), '86 535csi, '84 633 csi (turbo charged-sold) ![]() ![]() "Dream it, Believe it, Decide it, DO it " Last edited by 911Freak; 02-23-2008 at 11:14 AM.. Reason: (s) |
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Join Date: May 2003
Location: Winnipeg
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Just out of curiosity, how much oil was left in the engine after 80 miles of driving with a hole in the piston? What's the first / worst things to happen when running low on oil?
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Join Date: Jun 2003
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Rebuild the 2.7. I was pleasantly surprised when I got my case back from the machinist. This whole nightmare of machining costs for a 2.7 is a bit overplayed IMHO. Besides, have you priced a P&C set for a 3.0 and greater?
![]() The 2.7 you OWN is a bird in the hand. I bet the purchasing costs for a 3.0 and rebuild would exceed the costs of doing your 2.7 correctly. My .02
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Nate |
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Thanks for the replies. Your input is helping me decide what to do. I do want to get my parts to a Porsche machinist and still want some recommendations in my general area. Prior to that I may bring the crank to a local shop to see if the surfaces are a concern. I need to tear down the 'other' 2.7 engine I bought cheap to evaluate replacements for parts that were destroyed (Piston) and damaged (cylinder, head and oil pump). I did finally rotate and look at my oil pump and it sticks a little and shows damage to a limited band of the scavange section. This would be what is picked up from the sump before the filter. It has been recommended to open the filter - I'll look into how best to do that - any recommendations?
I posed my bearings for a look-see. To me they do not show any horrible problems. The pitting in the intermediate shaft bearings seems interesting and perhaps a sign of the 16 years of little use this car saw. ![]() ![]()
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75 911S Targa - Mine from 2001 until sold to Germany buyer 10/2016 <ALL DIY> Brakes/Wheels '01, Body/paint/restoration 7/04, Suspension 3/07 Engine rebuild - done 7/08 - added 28 tube cooler and SSIs - running strong. Ducktail painted. 2021 MachE, 2012 Outback, 2019 Crosstrek, 2018 Impreza wagon |
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Irrationally exuberant
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Quote:
I paid $1000 to a have a 2.7 case machined last year - resized to standard, stud inserts, etc. Nothing fancy. What did you have done to your 2.7 case and what did you pay? thanks, -Chris
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+1 on the bearing surface
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To answer an earlier question - The oil drained from the engine looked fine and was short about two quarts from my 9 quart refill (no external cooler) a short distance before. So I did lose oil from the crankcase through that big hole in the piston. I kept my eye on the oil level and oil pressure gauges and they didn't vary much as I drove. I was hyperaware as I drove.
Tonight I pulled the # 1 rod and all the bearing surfaces looked fine. Even the wrist pin bushing attached to that piston looked undamaged. So what about those head studs pictured above? Timecerted or what?? Will get the 'donor' engine up on the stand tomorrow and start the teardown as time allows. I'm not sure what means - can you elaborate?
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75 911S Targa - Mine from 2001 until sold to Germany buyer 10/2016 <ALL DIY> Brakes/Wheels '01, Body/paint/restoration 7/04, Suspension 3/07 Engine rebuild - done 7/08 - added 28 tube cooler and SSIs - running strong. Ducktail painted. 2021 MachE, 2012 Outback, 2019 Crosstrek, 2018 Impreza wagon |
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Quote:
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Nate Last edited by Fidalgo911S; 02-25-2008 at 06:01 AM.. |
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Racer
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I'd say some of your head stud mounting holes have been time-serted, yes.
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Preston Brown Street: 2009 911 Carrera S Coupe | 2015 Cayenne S | 1995 Audi ÜrS6 (unicorn) 1965 356 C Coupe | 2010 F250 (support vehicle) Race: 1994 964 GT2/1 | Various 944s | 2016 Superlite SLC | 2007 997 Carrera |
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Thanks for the timecert ID. Some places do that fix rather than casesavers. the two explainations I've heard are not convincing. EBS racing in Reno uses timecerts becuse they have worked well and the company is a few doors down. A local VW shop told me that timecerts are preferred when you need space for the big bore spigots they use.
I'll take mine to be ID'ed by the VW guy. I have been having no success finding a close specialty Porsche machine shop. Jerry Woods told me that they really don't do cases. Obviously Competition Engineering is a candidate but not a drive-in for me up here in Redding (150 mi N of Sacramento). AS much as I'd like to put it all in front of the same machinist, I think I would end up doing the crank polish locally etc.
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75 911S Targa - Mine from 2001 until sold to Germany buyer 10/2016 <ALL DIY> Brakes/Wheels '01, Body/paint/restoration 7/04, Suspension 3/07 Engine rebuild - done 7/08 - added 28 tube cooler and SSIs - running strong. Ducktail painted. 2021 MachE, 2012 Outback, 2019 Crosstrek, 2018 Impreza wagon |
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