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Registered
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What Rings with my JE Pistons and other quesitons
Hi all,
Some of you know that I'm rebuilding my 2.7 MFI. I have 4 questions: 1. I have JE pistons, they say 89M on the bottom of them. Does this mean 89mm? Isn't a stock 2.7 meant to have 90mm pistons? Does the piston expand? 2. What rings can I buy to go with these pistons? 3. What is the ring gap tollerance on all three rings? 4. How do I find out the compression ratio of these? The previous owner says 9.8:1 but he's a bit of an airhead and very unhelpful so I don't trust what he says. For those of you who say call JE, I did. I was given such a hard time on the phone by their person that I was totally put off. Basically they didn't help. I'm not sure if the person I got just had a bad day but seriously, if that's customer service then these guys derserve to be out of business. Thanks for the help!!! Tristan |
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11-05-2003, 12:16 PM
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No Expert
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My JEs came with Deves Rings. The part number is POR.92.00 JE SP, but mine were for 92mm pistons. Call Don at EBS, he may be more helpful than J&E, and can sell you the rings. Their standard JE pistons are either 9.5:1 or 10.3:1, but you can get them custom, so yours could actually be 9.8:1. Measure your pistons with a micrometer. They should be 89.96mm or so at the skirt if they are for standard 90 mm jugs. They will be smaller at the crown. Nominal ring gap for Deves 90mm rings are 0.25mm to 0.45mm. I hope this helps.
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-- Last Engine rebuild project, Now a coffee table. -- New engine rebuild project, Alive and well. -- '72 911 Martini RS, '69 911E Targa, a 2004 Cayenne S, and a Miata too... Looking for a Cayman S |
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11-05-2003, 04:49 PM
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Registered
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Thanks JP. Will call.
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11-05-2003, 04:56 PM
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Stressed Member
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Tristan-
My JE 90mm pistons say 89m on the underside as well. I'm sure that doesnot mean that they are 89mm. As mentioned, EBS would be glad to help you out. -Scott
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'70 911E short stroke 2.5 MFI. Sold  '56 Cliff May Prefab |
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11-05-2003, 06:15 PM
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Registered
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Has anyone tried Total Seal rings?
I am thinking of using them in my 2.0S when I rebuild. Any problems with that? Bob
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Bob Hutson |
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11-05-2003, 07:21 PM
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Irrationally exuberant
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Quote:
-Chris
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'80 911 Nogaro blue Phoenix! '07 BMW 328i 245K miles! http://members.rennlist.org/messinwith911s/ |
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11-06-2003, 07:10 AM
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1974 Porsche 911 2.7 RS Spec
1969 Porsche 911E 2.2
911 Martini RSR look alike
Cayenne S
Cayman S
1970 Porsche 911E
Harley
The Blue Pheonix
