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Registered
Join Date: Sep 2002
Location: Tulsa, OK
Posts: 134
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1972 911T 2.4 Build
I accidently posted this in the 911 Technical Forum yesterday....
I'm considering using the stock cast iron cylinders, bored to 85mm, and using JE pistons. I've seen this referenced in numerous threads but I have not been able to find much detailed info on the process. - When boring the cylinders should they be bolted to some type of a torque plate fixture? - Should I source the pistons and take them to the machine shop when I get the cylinders bored? I attached a pic of #1 piston and cylinder. (#1 exhaust valve dropped. Head & piston were destroyed. I bead blasted the piston so it could be used for "desk art". The exhaust guides on the remaining cylinders are all very worn.) - Do you think this cylinder will clean-up when bored to 85mm?  
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03-05-2019, 05:35 AM
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911 2.2 T targa
Join Date: Jun 2012
Location: Netherlands
Posts: 89
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Yes first source the pistons. The cylinders have to made to fit the pistons. When using cast iron cylinders you have to take in account the material of the pistons. If you switch to forced JE pistons instead of the old cast pistons with inserts, the the cylinder to piston clearance needs to be made to compensate for the difference in expansion.
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03-05-2019, 11:30 PM
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Under the radar
Join Date: May 2007
Location: Fortuna, CA. On the Lost Coast near the Emerald Triangle
Posts: 7,129
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There are companies that specialize in air cooled motors and can bore the cylinders. It takes a special jig and machinery. If those are iron cylinders make sure you let JE know so they can supply the correct pistons.
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Gordon ___________________________________ '71 911 Coupe 3,0L outlawed #56 PCA Redwood Region, GGR, NASA, Speed SF Trackrash's Garage :: My Garage |
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03-06-2019, 06:33 AM
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I would go for a new set of P/C. JE 9.5/1 CR and Molly Nickicill cylinders. EBS will sell you the matched set. The extra compression will make a nice upgrade. This is the very heart of the engine.
Chris 73 E |
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03-06-2019, 07:59 AM
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Registered
Join Date: Sep 2002
Location: Tulsa, OK
Posts: 134
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Some more questions....
2.4T 4R case
85 or 86mm Ps&Cs 9.5:1 CR 40 Webers Stock "T" heads/ports Stock gear ratios (901) Weekend Driver, some DEs and AX What would be the best cam for this application? (I asked this same question on the 914 forum and got the following) (5) votes for "E" (4) votes for "Solex" (2) votes for "DC30" (one with recommendation for "S" porting |
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03-07-2019, 12:00 PM
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Registered
Join Date: Nov 2004
Location: calgary.ab.ca
Posts: 252
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Quote:
1969 911T with E cams or S or Solex??
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Keith - Calgary 1969 912R (911 engine) - Blutorange |
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03-07-2019, 08:03 PM
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My Garage
1971 Porsche 911
Baja Bug
