Compression on the SIX, what do you think? |
|
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. |
|
Compression on the SIX, what do you think? |
Trekkor |
Jan 20 2005, 08:34 PM
Post
#1
|
I do things... Group: Members Posts: 7,809 Joined: 2-December 03 From: Napa, Ca Member No.: 1,413 Region Association: Northern California |
1. 162
2. 155 3. 148 4. 145 5. 140 6. 162 Not too alarming, is it? KT |
Dr Evil |
Jan 20 2005, 08:35 PM
Post
#2
|
Send me your transmission! Group: Members Posts: 22,995 Joined: 21-November 03 From: Loveland, OH 45140 Member No.: 1,372 Region Association: MidAtlantic Region |
Is it broken in yet? Have the rings fully seated? Does that matter?
|
Joe Bob |
Jan 20 2005, 08:41 PM
Post
#3
|
Retired admin, banned a few times Group: Members Posts: 17,427 Joined: 24-December 02 From: Boulder CO Member No.: 5 Region Association: None |
It ain't great....did you do it with all the plugs out, hot engine and WOT?
Have you done a leak down? Have you tried a little oil in the low holes and recheck? |
Trekkor |
Jan 20 2005, 08:45 PM
Post
#4
|
I do things... Group: Members Posts: 7,809 Joined: 2-December 03 From: Napa, Ca Member No.: 1,413 Region Association: Northern California |
Did it bone ( freezing ) cold, WOT and only plug out for each hole being tested.
KT |
jim912928 |
Jan 20 2005, 08:50 PM
Post
#5
|
Senior Member Group: Members Posts: 1,485 Joined: 8-January 04 From: Granger, IN Member No.: 1,536 Region Association: Upper MidWest |
what mike said...engine should be warm and all the plugs out. If you find any cylinders low squirt some oil down there and recheck. If the pressure comes up to be more inline with the others then it points to rings. If it doesn't matter it could be valves. Leak down will be your next test.
|
Trekkor |
Jan 20 2005, 08:56 PM
Post
#6
|
I do things... Group: Members Posts: 7,809 Joined: 2-December 03 From: Napa, Ca Member No.: 1,413 Region Association: Northern California |
Why do the other plugs need to be out?
KT |
scotty914 |
Jan 20 2005, 09:00 PM
Post
#7
|
suby torque rules Group: Members Posts: 1,525 Joined: 20-July 03 From: maryland, the land of 25 year Member No.: 924 |
you dont want the starter fighting the compression stroke on the other cylinders, or drawing a vacumn on the intake
|
McMark |
Jan 20 2005, 09:09 PM
Post
#8
|
914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
(IMG:http://www.914world.com/bbs2/html/emoticons/agree.gif) The engine spins easier and faster with all the plugs out.
|
Joe Bob |
Jan 20 2005, 09:13 PM
Post
#9
|
Retired admin, banned a few times Group: Members Posts: 17,427 Joined: 24-December 02 From: Boulder CO Member No.: 5 Region Association: None |
AND it simulates real time running....at high rpms....you're trying do a check at highest operating level....
|
Joe Bob |
Jan 20 2005, 09:15 PM
Post
#10
|
||
Retired admin, banned a few times Group: Members Posts: 17,427 Joined: 24-December 02 From: Boulder CO Member No.: 5 Region Association: None |
JUST DO IT AND STOP ARGUING..... Works with my kids..... (IMG:http://www.914world.com/bbs2/html/emoticons/biggrin.gif) |
||
boxstr |
Jan 20 2005, 09:18 PM
Post
#11
|
MEMBER:PACIFIC NORTHWEST REGION Group: Members Posts: 7,522 Joined: 25-December 02 From: OREGON Member No.: 12 Region Association: Pacific Northwest |
KT I have a freshly rebuilt 2.0 four I'll trade you for the weak six. (IMG:http://www.914world.com/bbs2/html/emoticons/laugh.gif)
CCLINSORRYCAN"THELPMYSELF |
Trekkor |
Jan 20 2005, 09:19 PM
Post
#12
|
I do things... Group: Members Posts: 7,809 Joined: 2-December 03 From: Napa, Ca Member No.: 1,413 Region Association: Northern California |
So, a warmed up motor and plugs out will give me improved numbers?
KT |
scotty914 |
Jan 20 2005, 09:20 PM
Post
#13
|
suby torque rules Group: Members Posts: 1,525 Joined: 20-July 03 From: maryland, the land of 25 year Member No.: 924 |
one word..... yup
|
jim912928 |
Jan 20 2005, 09:21 PM
Post
#14
|
Senior Member Group: Members Posts: 1,485 Joined: 8-January 04 From: Granger, IN Member No.: 1,536 Region Association: Upper MidWest |
might not be improved but they will be more accurate. Oil will be all around the cylinder walls and tolerances will be better with things being alittle warmer.
|
Trekkor |
Jan 20 2005, 09:28 PM
Post
#15
|
I do things... Group: Members Posts: 7,809 Joined: 2-December 03 From: Napa, Ca Member No.: 1,413 Region Association: Northern California |
Where should the numbers be?
KT |
iiibdsiil |
Jan 20 2005, 09:37 PM
Post
#16
|
Needs Door Locks Group: Members Posts: 605 Joined: 19-November 03 From: Tampa / Boca Raton, FL Member No.: 1,362 |
Consistency is the key thing. I think the allowed tolerance is 12 psi, but I could be wrong. Looks like you should be about 160.
|
Joe Bob |
Jan 20 2005, 09:42 PM
Post
#17
|
Retired admin, banned a few times Group: Members Posts: 17,427 Joined: 24-December 02 From: Boulder CO Member No.: 5 Region Association: None |
170 and above is great.....
|
Trekkor |
Jan 20 2005, 09:50 PM
Post
#18
|
I do things... Group: Members Posts: 7,809 Joined: 2-December 03 From: Napa, Ca Member No.: 1,413 Region Association: Northern California |
A local mechanic said no more than a 25% differance between best and worst.
I'm at 14% (IMG:http://www.914world.com/bbs2/html/emoticons/confused24.gif) KT |
jim912928 |
Jan 20 2005, 09:58 PM
Post
#19
|
Senior Member Group: Members Posts: 1,485 Joined: 8-January 04 From: Granger, IN Member No.: 1,536 Region Association: Upper MidWest |
post your new numbers...they should get closer. But even if they do not improve I don't think they are drastic enough or low enough to warrant tearing anything apart. Just drive and have fun!
|
Gint |
Jan 20 2005, 10:01 PM
Post
#20
|
Mike Ginter Group: Admin Posts: 16,066 Joined: 26-December 02 From: Denver CO. Member No.: 20 Region Association: Rocky Mountains |
I've run worse. 14% isn't great, but it'll run OK. Don't worry about it.
|
Lo-Fi Version | Time is now: 29th April 2024 - 06:10 PM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |