Exhaust leak or compression leak? |
|
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. |
|
Exhaust leak or compression leak? |
vw_porsche |
Oct 7 2015, 09:32 PM
Post
#1
|
Member Group: Members Posts: 129 Joined: 2-June 13 From: Milton, Fl. Member No.: 15,954 Region Association: South East States |
I have a strange sound I can't identify coming from #1 cylinder. It sounds like a exhaust leak coming off of the head at times, but not all the time. But, I can't feel a leak or stop the sound. Yes, I annealed the copper ring too.
The sound kinda comes and goes. If I get on the throttle hard I hear it, but after a bit it seems to change and sometimes go away. It seems to change with the temp changes. I've done a compression test warm and cold and all is normal. I guess I'm wondering if a compression leak from between the cylinder and head can come and go? (I did not use the head gaskets. I lapped the cylinders to the heads...) Or, could it be something more like piston slap? Any other input would be appreciated. Thanks, Jon |
vw_porsche |
Oct 8 2015, 09:34 PM
Post
#2
|
Member Group: Members Posts: 129 Joined: 2-June 13 From: Milton, Fl. Member No.: 15,954 Region Association: South East States |
|
76-914 |
Oct 9 2015, 03:03 PM
Post
#3
|
Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,455 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California |
Turn the crank until both ex & in valves for #1 are closed. Pressurize the cylinder with some air thru the spark plug hole and have someone listen thru the tail pipe then the carb or throttle body serving that cylinder. You'll hear it on one or the other if it is a valve seal problem.
|
Lo-Fi Version | Time is now: 29th March 2024 - 04:04 AM |
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 ... |