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Join Date: Aug 2013
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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

Old 12-08-2013, 12:19 AM
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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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1980 911SC coupe "Zeus" 3.3SS
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Old 12-08-2013, 02:59 AM
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Thanks Fred, I will ask the wife to get it for me for Christmas!
Old 12-08-2013, 10:56 PM
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83 911 Production Cab #10
 
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Quote:
Originally Posted by Midlifecrisis42 View Post
Thanks Fred, I will ask the wife to get it for me for Christmas!
No, you get the book and ask the wife for the Top End parts for Xmas
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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
Old 12-09-2013, 01:00 AM
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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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Old 12-09-2013, 11:04 AM
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