Valve adjustment, Chrome moly push rods |
|
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. |
|
Valve adjustment, Chrome moly push rods |
80cap |
Apr 20 2018, 02:28 PM
Post
#1
|
Member Group: Members Posts: 318 Joined: 6-February 15 From: ohio Member No.: 18,405 Region Association: None |
Ok, I set the valves to zero lash the engine has a very noticeable rattle. I think I read that they will sound like a bucket of bolts but I don't recall the sound level being this loud. I rechecked the clearance twice. The engine pulls real strong. I'm all ears!
Brian |
iankarr |
Apr 20 2018, 03:42 PM
Post
#2
|
The wrencher formerly known as Cuddy_K Group: Members Posts: 2,512 Joined: 22-May 15 From: Heber City, UT Member No.: 18,749 Region Association: Intermountain Region |
shouldnt really sound like a bucket o bolts. do you have hydraulic lifters? If so, and it's been a while since the car was driven, it can sound really noisy till the lifters inflate with oil
|
80cap |
Apr 20 2018, 04:29 PM
Post
#3
|
Member Group: Members Posts: 318 Joined: 6-February 15 From: ohio Member No.: 18,405 Region Association: None |
Solid lifters.
Brian |
TheCabinetmaker |
Apr 20 2018, 05:52 PM
Post
#4
|
I drive my car everyday Group: Members Posts: 8,309 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
Should sound very smooth. No rattles.
|
porschetub |
Apr 20 2018, 06:08 PM
Post
#5
|
Advanced Member Group: Members Posts: 4,725 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
I don't understand zero lash with steel pushrods ,makes sense on a hyd lifter motor but on a solid tappet motor what happens when the engine heats up and expands width wise ?,surely the expansion rate would be different between steel and alloy pushrods ???.
I'am old but I never stop learning (IMG:style_emoticons/default/av-943.gif) (IMG:style_emoticons/default/av-943.gif) |
Mueller |
Apr 20 2018, 08:06 PM
Post
#6
|
914 Freak! Group: Members Posts: 17,150 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None |
Case ans heads are aluminium, they expand more than steel.
|
craig downs |
Apr 20 2018, 08:09 PM
Post
#7
|
Senior Member Group: Members Posts: 769 Joined: 25-November 05 From: mira loma ca. Member No.: 5,189 Region Association: Southern California |
Check the clearance between the rockers and spacers. If it is a lot then that makes noise to.
|
wndsrfr |
Apr 20 2018, 08:37 PM
Post
#8
|
Senior Member Group: Members Posts: 1,436 Joined: 30-April 09 From: Rescue, Virginia Member No.: 10,318 Region Association: MidAtlantic Region |
Case ans heads are aluminium, they expand more than steel. (IMG:style_emoticons/default/agree.gif) Jake explains it that way....with lash at zero with engine cold it'll open up to .004-.006 with the engine hot, so you'll hear a bit of the usual ticking from the valves especially with thin oil....BP 20/50 may keep it a bit quieter... |
nditiz1 |
Apr 21 2018, 06:29 AM
Post
#9
|
Senior Member Group: Members Posts: 1,202 Joined: 26-May 15 From: Mount Airy, Maryland Member No.: 18,763 Region Association: MidAtlantic Region |
When should you use 0 valve lash vs the .006/.008?
|
80cap |
Apr 21 2018, 06:50 AM
Post
#10
|
Member Group: Members Posts: 318 Joined: 6-February 15 From: ohio Member No.: 18,405 Region Association: None |
Only with chrome moly push rods.
I going to check again for a loose rocker today before cars and coffee. Brian (IMG:style_emoticons/default/headbang.gif) |
Mark Henry |
Apr 21 2018, 06:54 AM
Post
#11
|
that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
Running .006 on steel PR will make them noisier.
They are noticeably noisier cold and you can still hear it warm, especially if you have a quiet exhaust. |
Lo-Fi Version | Time is now: 27th September 2024 - 10:53 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 ... |