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Join Date: Apr 2010
Posts: 37
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Engine rebuild?
Hi experts,
I recently bought a '71 911 T Targa with a 2.4 T engine (engine type 911/57). Although the engine was out of the Targa and the Targa needs a full restoration, the seller advertised the 911 with a high compression (good) engine. Bought it for a good price and brought it home. Pulled the sparkplugs and on all 6 pistions I see this indent as in the picture enclosed. Not good I suppose (T pistons shouldn't have that I believe). Pistons/valves bad? The engine doesn't have an engine number. The casing is the 7R casing. Was it modified wrong in its previous life? 
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----------------------------------- 1971 911 T Targa 1980 930 Turbo 2017 991.2 4S Targa |
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12-09-2023, 11:14 AM
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Registered
Join Date: Jul 2001
Location: mt. vernon Wa. USA
Posts: 8,709
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pistons
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[B]Current projects: 69-911.5, Previous:73 911X (off to SanFrancisco/racing in Germany).77 911S (NY), 71E (France/Corsica), 66-912 ( France), 1970 914X (Wisconsin) 76 911S roller..off to Florida/Germany RGruppe #669 http://www.x-faktory.com/ |
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12-09-2023, 11:32 AM
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Join Date: Dec 2020
Location: The Swamp and NC
Posts: 450
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What plugs were in it when you pulled them?
Did they look stashed or did the PO change them?
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I'm not picking my nose..I'm porting my upper intake manifold. |
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12-09-2023, 01:49 PM
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PCA Member since 1988
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That divot is a valve clearance cut out. If it was an E or S, it would be deeper.
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1973.5 911T with RoW 1980 SC CIS stroked to 3.2, 10:1 Mahle Sport p/c's, TBC exhaust ports, M1 cams, SSI's. RSR bushings & adj spring plates, Koni Sports, 21/26mm T-bars, stock swaybars, 16x7 Fuchs w Michelin Pilot Sport A/S 3+, 205/55-16 at all 4 corners. Cars are for driving. If you want art, get something you can hang on the wall! |
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12-09-2023, 04:23 PM
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Join Date: Apr 2010
Posts: 37
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Thanks for the replies! When I looked up pistons for a 2.4 T online, I got some other, maybe standard piston images. But this helps me out. Thanks!
The plugs that I took out are Bosch Super W3CC and look ok.
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----------------------------------- 1971 911 T Targa 1980 930 Turbo 2017 991.2 4S Targa |
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12-09-2023, 11:45 PM
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Registered
Join Date: Oct 2008
Location: Nash County, NC.
Posts: 8,480
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Possibly a 2.2 t piston that’s been fit on the 2.4 crank giving low 9.3 CR
Bruce |
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12-10-2023, 05:04 AM
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