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930 Engine longevity.

I'm considering buying a stock 1982 930 with 100,000 miles. It appears to have been well maintained but the engine looks to be untouched. Assuming a 'normal' driving profile (i.e. no track work, reasonable mix of town/country driving etc), at what point do these engines need work?

I'm familiar with NA Porsche engines, having built several, but not turbos. I assume the bottom ends are relatively bullet-proof? And I suspect that the top end has to handle higher temperatures which may compromise longevity? Any input most welcome. TIA.
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Old 05-11-2010, 04:10 PM
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Seems like valve guides, maybe cams, timing chains and timing chain ramps are the common items.

HFR_Racer
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'87 930, 3.3 liter, K27 hybrid, Kokeln IC, Andial, B&B, Borla, 17" Supercups.
Old 05-11-2010, 04:55 PM
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If the PO did not run higher than 1 bar boost spring and/or track the car, temp is not an issue. A well maintained 930 motor with 100,000 miles is most likely close to needing an on-going list of things. Have a leak down test done to start then check for oil consumption through the tail pipe for turbo oil seal leak and so on....
Old 05-11-2010, 05:04 PM
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HFR_Racer, DonE - Many thanks. Pretty much as I expected. Engine, AFAIK is stock with stock boost. It will need to last for another couple of years (say 20000 miles) at which time I'm prepared to rebuild it - with suitable mods of course
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914/6 GT (Repro) Tarmac Rally car
928 S4 - 1989
911SC - 1980
Jeep Cherokee
Ford/Mazda 4WD Turbo
Old 05-11-2010, 05:17 PM
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These things can go at 30k or last well past 100k.

General condition appearance is one clue. If it is not leaking it has been re-sealed (check records) or has not had to much in the way of heat cycles.

However, a good PPI with leak down will be a better judge.

Maybe have them pull the lower valve covers for a look. A few of the better Porsche mechanics have developed a sense of the exhaust guide condition by checking for side to side play at the exhaust steem.
Old 05-12-2010, 06:39 AM
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911st. Thanks. Yes, a thorough PPI would be desirable. Problem is the car is not near anywhere convenient to get this done so I'll be relying on my own judgment. General consensus here is also that the exhaust guides are the most likely potential issue.
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914/6 GT (Repro) Tarmac Rally car
928 S4 - 1989
911SC - 1980
Jeep Cherokee
Ford/Mazda 4WD Turbo
Old 05-12-2010, 03:17 PM
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Mine has just done 100,000km and has lost some compression on one cylinder. It had been rebuilt at around 30,000km.
Look for smoke on start-up. Have a look at where it has been parked. If it's in a garage look at the wall/floor where the exhaust points at for evidence of oil on start-up.
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Old 05-13-2010, 10:31 PM
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Thanks Darkhorse. I had a completely stock 1981 930 that used to blow a bit of smoke on startup a few years back and sold it at about 120,000km - but not a hint of a problem otherwise. Bruce Anderson has commented that some cars just seem to do this for some unknown reason.

The more I talk to people, the more I come to the conclusion that there is no 'typical' service life. It seems to me that 930s, more than most other 911 models seem to be more sensitive to how they have been treated. Probably not surprising if you think about it...
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914/6 GT (Repro) Tarmac Rally car
928 S4 - 1989
911SC - 1980
Jeep Cherokee
Ford/Mazda 4WD Turbo
Old 05-13-2010, 11:52 PM
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So probably comes down to a ppi.
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Old 05-13-2010, 11:57 PM
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YES -- PPI or you deserve what you get!

A puff on start up can be nothing. Expecially on a turbo where its seals can leak oil into the intake track.

If you ever take your intercooler off you will see. Good to clean it out once in a while.
Old 05-14-2010, 08:05 AM
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How's the rest of the car? You can always replace an engine - expensive but you can. What about paint condition/seals, brakes, suspension, wreck?? straight???, transmisison #'s, interior... M2C
Old 05-14-2010, 04:04 PM
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Maybe mine is unusual, but I've got over 100k miles, it leaks NO oil and uses less than the 1 quart per 1000 miles mentioned in the owners manual. Mine runs perfect and shows no signs of impending failure.
Old 05-18-2010, 10:50 PM
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