 compression testing questions, is this normal |
|
|
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
|
  |
| freezing14 |
 Dec 10 2004, 07:58 AM
Post
#1
|
|
freezing14  Group: Members Posts: 435 Joined: 21-June 04 From: brockville , Ontario, Canada Member No.: 2,233  |
Ok got the frigging engine out because of those back fire,, remove the heads, , clean everything , lots of oil everywhere, and i do the compression test, here is the result
i did the test with 5 revolution on each , they all got the same result ( thats good) here my question 1st revolution 90 psi, 2 nd revolution 120 psi 3 rd revolution 155 psi 4 and 5 th revolution 155 is this ok , or do i need to change the rings or i am ready to (IMG:style_emoticons/default/driving.gif) |
   |
 
|
| Bleyseng |
Dec 10 2004, 08:12 AM
Post
#2
|
|
Aircooled Baby! Group: Members Posts: 13,034 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
R U doing the compression test with the engine warmed up?
Try squirting a little oil into the low cylinder and re test. If it stays down then you have a valve problem. ie -not seating or burning. Geoff |
|
|
|
| scotty914 |
Dec 10 2004, 08:15 AM
Post
#3
|
|
suby torque rules Group: Members Posts: 1,525 Joined: 20-July 03 From: maryland, the land of 25 year Member No.: 924 |
but before you do the test again do a valve adjust, and did you have the spark plugs out on all cylinders
and i though oil in the cylinders was for rings not valves |
|
|
|
| freezing14 |
Dec 10 2004, 08:16 AM
Post
#4
|
|
freezing14 Group: Members Posts: 435 Joined: 21-June 04 From: brockville , Ontario, Canada Member No.: 2,233 |
a little interpretation issue here
cylinder 1 revolution 1 90 psi rev 2 120 rev 3 150 rev 4-5 150 cylinder 2 revolution 1 90 psi rev 2 120 rev 3 150 rev 4-5 150 cylinder 3 revolution 1 90 psi rev 2 120 rev 3 150 rev 4-5 150 cylinder 4 revolution 1 90 psi rev 2 120 rev 3 150 rev 4-5 150 it says in the book with the compression tester that you need to use the same number of revolution testing |
|
|
|
| Bleyseng |
Dec 10 2004, 08:21 AM
Post
#5
|
|
Aircooled Baby! Group: Members Posts: 13,034 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
So 150 on all cylinders thats great. Hmm, you running carbs? or FI.
|
|
|
|
| scotty914 |
Dec 10 2004, 08:21 AM
Post
#6
|
|
suby torque rules Group: Members Posts: 1,525 Joined: 20-July 03 From: maryland, the land of 25 year Member No.: 924 |
thats (IMG:style_emoticons/default/wub.gif)
put the motor in and (IMG:style_emoticons/default/driving.gif) |
|
|
|
| freezing14 |
Dec 10 2004, 08:26 AM
Post
#7
|
|
freezing14 Group: Members Posts: 435 Joined: 21-June 04 From: brockville , Ontario, Canada Member No.: 2,233 |
I will be running FI unless it buzz me off, then I wil carb it,
the 150 was acheived at the 3rd revolution so it would be ok , May be i can drive it before we have snow on the ground definitively,,,,, (IMG:style_emoticons/default/mueba.gif) |
|
|
|
| Jake Raby |
Dec 10 2004, 09:56 AM
Post
#8
|
|
Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
Also, did you test with the throttle at full open?? If not the numbers can vary due to not getting very much air into the chambers.....
|
|
|
|
| freezing14 |
Dec 10 2004, 10:04 AM
Post
#9
|
|
freezing14 Group: Members Posts: 435 Joined: 21-June 04 From: brockville , Ontario, Canada Member No.: 2,233 |
I did the test with no intake runner,,,, so would be considered as the throttle open??????, I just wanna made sure it was OK before I put it back togheter and in the car
|
|
|
|
| Rhodes71/914 |
Dec 10 2004, 11:07 AM
Post
#10
|
|
Glacier Group: Members Posts: 1,374 Joined: 8-August 04 From: End of the Road, Alaska Member No.: 2,482 |
I think you should be happy with those results. Put it in and drive before the snow flies. Wish I was at that point, couple of weeks maybe.
|
|
|
|
|
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 3rd May 2024 - 07:04 AM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.