Pelican Parts
Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   Pelican Parts Forums > Porsche Forums > Porsche 911 Technical Forum


Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered
 
Join Date: Feb 2006
Location: Ireland
Posts: 93
Garage
Performing Compression Test

I've got my 2.7 engine removed from 1975 P car.

Can a compression test be carried out with the engine removed from the car?

__________________
1975 911 3.0 Carrera (964 Lookalike Weekender)
1975 911 2.7 (Project)
1979 Ford RS2000
1980 Mini 1275GT
1998 BMW 320i (Daily driver/Reliable Work Horse)
Old 09-25-2006, 12:10 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
Zef Zef is offline
THE IRONMAN
 
Zef's Avatar
 
Join Date: Sep 2005
Location: Montreal
Posts: 3,642
Garage
Yes you can...but it is always recommended to do it when the engine is warm if you want an exact reading result.
__________________
1984 911 CARRERA RUBY RED TARGA
SW CHIPPED-BURSCH CATBYPASS
MONTY FREE FLOW EXHAUST

<IN GAS WE TRUST>
Old 09-25-2006, 01:01 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
Registered
 
Scott R's Avatar
 
Join Date: Feb 2001
Location: Aspen CO US
Posts: 16,054
Garage
It would be better if oyu could swing a leakdown, I had nominal compression, however I had a 35% leak past the rings.
__________________
2021 Model Y
2005 Cayenne Turbo
2012 Panamera 4S
1980 911 SC
1999 996 Cab
Old 09-25-2006, 01:07 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
Registered
 
Join Date: Feb 2006
Location: Ireland
Posts: 93
Garage
What I am concerned about is a damaged valve, the engine was running fine when removed but there was a slight knocking sound.

My guess was that a compression test would easily identify if I had a damaged valve.
__________________
1975 911 3.0 Carrera (964 Lookalike Weekender)
1975 911 2.7 (Project)
1979 Ford RS2000
1980 Mini 1275GT
1998 BMW 320i (Daily driver/Reliable Work Horse)
Old 09-26-2006, 12:53 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)
Registered
 
Join Date: Jul 2000
Location: So. Calif.
Posts: 19,910
If you suspect a damaged valve, minimize engine rotations. I would perform a leakdown test at this point. Before testing, remove the valve covers and verify the suspected valve is not so bent it is stuck open (valve vs piston = bad).

If okay, manually rotate engine so test cylinder piston is at TDC, end of compression (careful), then do it. If you bent a valve, it'll be pretty obvious where the air leak is.

Sherwood
Old 09-26-2006, 01:24 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #5 (permalink)
Registered
 
Join Date: Feb 2006
Location: Ireland
Posts: 93
Garage
Ok

Thanks for the help all.

__________________
1975 911 3.0 Carrera (964 Lookalike Weekender)
1975 911 2.7 (Project)
1979 Ford RS2000
1980 Mini 1275GT
1998 BMW 320i (Daily driver/Reliable Work Horse)
Old 09-26-2006, 01:31 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #6 (permalink)
 
Reply


 


All times are GMT -8. The time now is 02:23 AM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2025, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2025 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page
 

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.