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1973 911 E cylinder options
I am rebuilding a 73E engine. The car has been sitting for about four years.
I am presently dis-assembling the engine for a rebuild. Like every body else that has and will travel this path, I was anxious to see the pistons and cylinders, hopeful to find them re-useable. In the next few weeks I will be taking my parts to my machine shop for their inspection and needed repairs. When I removed the cylinders I found some dark spots the I believe to be missing coating. The pistons look decent, but I will have them checked to see if in specs. My question would be what this forum would advise regarding my best options. My intentions are to rebuild the engine as close to original specs as possible. Thanks, Bill |
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12-17-2012, 05:22 PM
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Stock 2.4E barrels are regular cast iron liners with alloy finning, no Nikasil type coating on the liners. I would say that the dark patches are either heat marks or burnt oil oil deposits, depending where they are. Most likely the cylinders will clean up OK with a light deglaze hone. The pistons however will need careful checking to ensure the ring grooves are within tolerance, no point fitting new rings into worn piston ring grooves.
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1972 911T Coupe with a '73E MFI engine and 'S' pistons 10 year resto mostly completed, in original Albert Blue. ***If only I didn't know now what I didn't know then*** |
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12-17-2012, 07:32 PM
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Join Date: Jul 2001
Location: Wilmington, NC USA
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You can bore the cylinders out to an oversize spec and then buy oversize pistons to match. The OEM Mahle's are pretty expensive. JE pistons might be a good option.
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69 911 2.3Ez 85 928S |
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12-18-2012, 08:27 AM
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Join Date: Apr 2002
Location: Clinton, NJ
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You could always do what I did with my 72E. I had the cylinders bored out to 85 mm, and used JE 9.5:1 compression pistons. The additional compression really wakes the 2.4 up. I also used a Fidanza aluminum flywheel, for quick revving.
JMHO
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______________________________ Dave 1969 911T Coupe 1972 911E Targa |
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12-18-2012, 09:44 AM
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Quote:
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12-18-2012, 02:06 PM
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1973 911E cylinder options
Thanks for all the response. I really enjoy others ideas and input.
I thought the bores were Nikasil. They look plated except for the dark spots. When I get them to the machine shop I will see what they suggest. I kinda like the idea of boring them to 85mm and using higher compression pistons. Besides the flywheel what other mods did you do to the engine? What fueling are you using, carbs or fuel injection? I am really pumped about moving forward with this rebuild. I am actually about completely restoring the entire car and really looking forward to getting it back on the road! To everyone responding, Thanks again! Bill |
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12-18-2012, 03:41 PM
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Join Date: Apr 2002
Location: Clinton, NJ
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Bill, besides the bore to 85mm, the pistons, and the flywheel, it's stock. 2.4E MFI and cams, stock CDI ignition, SSIs, and a single outlet sport muffler. The guy who did the work is an old Porsche hand, and figures it's probably at about 185-190HP now. The light flywheel hasn't really caused any drivability problems at lower RPM, you just need to get on it a little more. Oh, and now I have to run Premium instead of Regular.
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______________________________ Dave 1969 911T Coupe 1972 911E Targa |
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12-18-2012, 05:49 PM
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If I recall weighing my Fidanza and stocker..... there is only 3lbs. difference.
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12-19-2012, 04:22 AM
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1972 Porsche 911T
