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Registered User
Join Date: Aug 2013
Posts: 3
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Engine Compression Numbers
The guys working on the resto of my 1970 T got these compression numbers from my engine,
1 - 90 2 - 90 3 - 90 4 - 130 5 - 90 6 - 90 They also said Scoping the bores shows cleaner edges to the piston tops meaning oil ring issues. the numbers say compression rings as well. I would say this motor needs a "Top-End" meaning, everything from the rings out (rings, valve guides, valves, rebuild carbs etc.) Can anyone recommend a thread I can read so I can learn more about this as I'm a newbie. I don't doubt the advice given is 100% correct as I trust them completely (well known in Porsche circles) I would just like to learn more and broaden my understanding of the topic. I would also like to understand about the compression numbers. Thanks ![]() |
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Registered
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Engine info
Buy a copy of Wayne's 911 engine rebuild book. It contains just about anything you would need to know about these engines. If I remember correctly, any compression variation from cylinder to cylinder of more than about 5% should be checked out. The 130 number is probably closer to what they all should be.
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FEC3 1980 911SC coupe "Zeus" 3.3SS god of thunder and lightning |
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Registered User
Join Date: Aug 2013
Posts: 3
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Thanks Fred, I will ask the wife to get it for me for Christmas!
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83 911 Production Cab #10
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Who Will Live... Will See ![]() ![]() ![]() 83 911 Production Cab #10, Slightly Modified: Unslanted, 3.2, PMO EFI, TECgt, CE 911 CAM Sync / Pulley / Wires, SSI, Dansk Sport 2/2, 17" Euromeister, CKO GT3 Seats, Going SOK Super Charger |
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This is a test....just how far can a man push the envelope in asking his wife for parts for the Porsche?
We are standing by! ..... LOL Bob
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Bob Hutson |
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