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 > 911 / 930 Turbo & Super Charging Forum


Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered User
 
DSPTurtle's Avatar
 
Join Date: Jul 2001
Location: Suntree, Florida, USA
Posts: 2,231
Compression Numbers Good???

So I tested the compression of the warm motor today. Cylinders 1-6 came back as 122, 122, 121, 120, 125, 125. Right side (passenger side) of motor had a little higher numbers. I did not charge the battery in-between and I did the right side first so I am thinking that contributed to the higher numbers. Or maybe that cam is just a hair different. Anyway, all were within 12 points (10%) of each other so I think that is good.
Anyone got a different thinking on these numbers?
(BTW, I am not sure I got number 4 totally tight so that may be contributing to the 120 when everything else on that side was 125)
__________________
JB - BreitWerks
www.breitwerks.com
321-806-8664
Engine Rebuild & Restorations
Old 10-15-2011, 02:22 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
beancounter
 
jwasbury's Avatar
 
Join Date: Jan 2008
Location: Weehawken, NJ
Posts: 3,369
I think I've heard the rule of thumb for compression test is all cylinders register within 10% of each other...looks like you hit that. Absolute value is of less importance so I have heard. Did you have the throttle open or closed?
__________________
Jacob
Current: 1983 911 GT4 Race Car / 1999 Spec Miata / 2000 MB SL500 / 1998 MB E300TD / 1998 BMW R1100RT / 2016 KTM Duke 690
Past: 2009 997 Turbo Cab / 1979 930
Old 10-15-2011, 02:33 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
Registered User
 
DSPTurtle's Avatar
 
Join Date: Jul 2001
Location: Suntree, Florida, USA
Posts: 2,231
Quote:
Originally Posted by jwasbury View Post
I think I've heard the rule of thumb for compression test is all cylinders register within 10% of each other...looks like you hit that. Absolute value is of less importance so I have heard. Did you have the throttle open or closed?
Closed. I thought about that 4 cylinders into it and said, aww fhuk it... and left it closed for the rest.
__________________
JB - BreitWerks
www.breitwerks.com
321-806-8664
Engine Rebuild & Restorations
Old 10-15-2011, 03:06 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 


All times are GMT -8. The time now is 08:23 PM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 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.