Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
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.
 

Welcome Guest ( Log In | Register )

2 Pages V  1 2 >  
 Reply to this topicStart new topic
> Valve Train mods, While I am in there......
jeffdon
post Aug 1 2012, 01:45 PM
Post #1


Senior Member
***

Group: Members
Posts: 1,094
Joined: 24-October 06
From: oakland, ca
Member No.: 7,087
Region Association: None
Getting set to drop the engine so I can have a sparkplug hole repaired.

While out, I am considering finally going through my valve train geometry, cutting custom pushrods, and going to swivel feet adjusters.

Does anyone have experience with the 9mm Rhino feet from CB performance? They are WAY less expensive than Porsche units, and would negate having to switch to 1.7 rockers.

Are they good, or just Chinese junk?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
TheCabinetmaker
post Aug 1 2012, 01:52 PM
Post #2


I drive my car everyday
*****

Group: Members
Posts: 8,300
Joined: 8-May 03
From: Tulsa, Ok.
Member No.: 666
I have not used the chinese stuff, but the 911 adjusters must use the 1.7 rockers. The 2.0L rockers have a bigger adjuster thread.

I really don't see you have anything to gain with a stock engine.
User is online!Profile CardPM
Go to the top of the page
+Quote Post
jeffdon
post Aug 1 2012, 02:00 PM
Post #3


Senior Member
***

Group: Members
Posts: 1,094
Joined: 24-October 06
From: oakland, ca
Member No.: 7,087
Region Association: None
QUOTE(The Cabinetmaker @ Aug 1 2012, 12:52 PM) *

I have not used the chinese stuff, but the 911 adjusters must use the 1.7 rockers. The 2.0L rockers have a bigger adjuster thread.

I really don't see you have anything to gain with a stock engine.


Its not stock. 2056 with webers and a webcam #494.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
TheCabinetmaker
post Aug 1 2012, 02:07 PM
Post #4


I drive my car everyday
*****

Group: Members
Posts: 8,300
Joined: 8-May 03
From: Tulsa, Ok.
Member No.: 666
Well nevermind then! My 2056 has all the valve train upgrades but the heavey duty springs. Even with stock springs the rev in the upper limits is smoother. I like adjusting the valves at zero lash with the chromemoly pusrods.
User is online!Profile CardPM
Go to the top of the page
+Quote Post
jeffdon
post Aug 1 2012, 02:10 PM
Post #5


Senior Member
***

Group: Members
Posts: 1,094
Joined: 24-October 06
From: oakland, ca
Member No.: 7,087
Region Association: None
QUOTE(The Cabinetmaker @ Aug 1 2012, 01:07 PM) *

Well nevermind then! My 2056 has all the valve train upgrades but the heavey duty springs. Even with stock springs the rev in the upper limits is smoother. I like adjusting the valves at zero lash with the chromemoly pusrods.


Good to know. What procedure are you using to measure zero lash?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
McMark
post Aug 1 2012, 02:43 PM
Post #6


914 Freak!
***************

Group: Retired Admin
Posts: 20,179
Joined: 13-March 03
From: Grand Rapids, MI
Member No.: 419
Region Association: None
They way I think of it:

Porsche builds components that live up the their long reputation of quality.
CBPerformance builds (rather RESELLS) components that meet a price point. Quality isn't the first priority.

So if your first priority is cost, buy the CBPerformance pieces. If your first priority is quality and long life, shell out for the Porsche components.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jeffdon
post Aug 1 2012, 02:47 PM
Post #7


Senior Member
***

Group: Members
Posts: 1,094
Joined: 24-October 06
From: oakland, ca
Member No.: 7,087
Region Association: None
QUOTE(McMark @ Aug 1 2012, 01:43 PM) *

They way I think of it:

Porsche builds components that live up the their long reputation of quality.
CBPerformance builds (rather RESELLS) components that meet a price point. Quality isn't the first priority.

So if your first priority is cost, buy the CBPerformance pieces. If your first priority is quality and long life, shell out for the Porsche components.


Good point, Mark. What would your take be on used 911 adjusters if I can find them?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Katmanken
post Aug 1 2012, 02:50 PM
Post #8


You haven't seen me if anybody asks...
****

Group: Members
Posts: 4,738
Joined: 14-June 03
From: USA
Member No.: 819
Region Association: Upper MidWest
(IMG:style_emoticons/default/popcorn[1].gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
McMark
post Aug 1 2012, 03:33 PM
Post #9


914 Freak!
***************

Group: Retired Admin
Posts: 20,179
Joined: 13-March 03
From: Grand Rapids, MI
Member No.: 419
Region Association: None
I don't think I've heard of OE swivels going bad. New would make me feel better. But used OE would be a good second place unless someone else chimes in with stories of swivel failure.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Valy
post Aug 1 2012, 03:44 PM
Post #10


Senior Member
***

Group: Members
Posts: 1,675
Joined: 6-April 10
From: Sunnyvale, CA
Member No.: 11,573
Region Association: Northern California
I would evaluate the state of the cam before doing any changes. The 911 adjusters only at high lift. If your cam is worn out than you better not add heavier lifters. Also old valve springs won't like the heavier lifters as well.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jeffdon
post Aug 1 2012, 08:26 PM
Post #11


Senior Member
***

Group: Members
Posts: 1,094
Joined: 24-October 06
From: oakland, ca
Member No.: 7,087
Region Association: None
QUOTE(Valy @ Aug 1 2012, 02:44 PM) *

I would evaluate the state of the cam before doing any changes. The 911 adjusters only at high lift. If your cam is worn out than you better not add heavier lifters. Also old valve springs won't like the heavier lifters as well.


The cam is higher lift than stock....springs are stock....really confused now.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
McMark
post Aug 1 2012, 11:47 PM
Post #12


914 Freak!
***************

Group: Retired Admin
Posts: 20,179
Joined: 13-March 03
From: Grand Rapids, MI
Member No.: 419
Region Association: None
The swivel foot adjusters are hardly heavier than stock. And if you were to cut off the excess thread they would probably be lighter. Not that I'd promote that.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
euro911
post Aug 2 2012, 12:47 AM
Post #13


Retired & living the dream. God help me if I wake up!
*****

Group: Members
Posts: 8,849
Joined: 2-December 06
From: So.Cal. & No.AZ (USA)
Member No.: 7,300
Region Association: Southern California
We're also running a 2056, Mahle jugs, Keith Black pistons, Raby spec'd heads with 44/38mm S/S valves, 9.0:1 C/R, 9580 cam, chromemoly push rods, 911 swivels and clearanced 1.7L rocker arms.

Just a suggestion, but if you're having one spark plug hole repaired, it's a good idea to have steel inserts installed in all four holes ... no more stripped or cross-thread issues (IMG:style_emoticons/default/idea.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jeffdon
post Aug 2 2012, 07:34 AM
Post #14


Senior Member
***

Group: Members
Posts: 1,094
Joined: 24-October 06
From: oakland, ca
Member No.: 7,087
Region Association: None
QUOTE(euro911 @ Aug 1 2012, 11:47 PM) *

We're also running a 2056, Mahle jugs, Keith Black pistons, Raby spec'd heads with 44/38mm S/S valves, 9.0:1 C/R, 9580 cam, chromemoly push rods, 911 swivels and clearanced 1.7L rocker arms.

Just a suggestion, but if you're having one spark plug hole repaired, it's a good idea to have steel inserts installed in all four holes ... no more stripped or cross-thread issues (IMG:style_emoticons/default/idea.gif)


Considering this, but have heard somewhere that the 2.0 heads have less heat dissipating ability around the plugs, which is further diminished with the inserts. But I am thinking, really, how much material could you loose?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Valy
post Aug 2 2012, 08:48 AM
Post #15


Senior Member
***

Group: Members
Posts: 1,675
Joined: 6-April 10
From: Sunnyvale, CA
Member No.: 11,573
Region Association: Northern California
QUOTE(jeffdon @ Aug 1 2012, 07:26 PM) *

QUOTE(Valy @ Aug 1 2012, 02:44 PM) *

I would evaluate the state of the cam before doing any changes. The 911 adjusters only at high lift. If your cam is worn out than you better not add heavier lifters. Also old valve springs won't like the heavier lifters as well.


The cam is higher lift than stock....springs are stock....really confused now.


The cam HAD higher lift that stock when new. You should check how much is left of that lift.
Not implying that your cam is gone but I've seen flat cams on low mileage engines.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jeffdon
post Aug 2 2012, 09:00 AM
Post #16


Senior Member
***

Group: Members
Posts: 1,094
Joined: 24-October 06
From: oakland, ca
Member No.: 7,087
Region Association: None
QUOTE(Valy @ Aug 2 2012, 07:48 AM) *

QUOTE(jeffdon @ Aug 1 2012, 07:26 PM) *

QUOTE(Valy @ Aug 1 2012, 02:44 PM) *

I would evaluate the state of the cam before doing any changes. The 911 adjusters only at high lift. If your cam is worn out than you better not add heavier lifters. Also old valve springs won't like the heavier lifters as well.


The cam is higher lift than stock....springs are stock....really confused now.


The cam HAD higher lift that stock when new. You should check how much is left of that lift.
Not implying that your cam is gone but I've seen flat cams on low mileage engines.


After only 8k miles? It would be scary to see a significant reduction in lift after only 8k.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
ChrisFoley
post Aug 2 2012, 11:02 AM
Post #17


I am Tangerine Racing
*****

Group: Members
Posts: 7,925
Joined: 29-January 03
From: Bolton, CT
Member No.: 209
Region Association: None
Its even worse when the cam goes flat in less than 80 miles. (IMG:style_emoticons/default/unsure.gif)
It happens.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jeffdon
post Aug 2 2012, 12:10 PM
Post #18


Senior Member
***

Group: Members
Posts: 1,094
Joined: 24-October 06
From: oakland, ca
Member No.: 7,087
Region Association: None
QUOTE(Racer Chris @ Aug 2 2012, 10:02 AM) *

Its even worse when the cam goes flat in less than 80 miles. (IMG:style_emoticons/default/unsure.gif)
It happens.


The cam and lifters are new, the springs are standard, running brad penn oil, so unless I got a flawed cam, what would cause such rapid wear?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
euro911
post Aug 2 2012, 12:16 PM
Post #19


Retired & living the dream. God help me if I wake up!
*****

Group: Members
Posts: 8,849
Joined: 2-December 06
From: So.Cal. & No.AZ (USA)
Member No.: 7,300
Region Association: Southern California
QUOTE(jeffdon @ Aug 2 2012, 06:34 AM) *
QUOTE(euro911 @ Aug 1 2012, 11:47 PM) *
... Just a suggestion, but if you're having one spark plug hole repaired, it's a good idea to have steel inserts installed in all four holes ... no more stripped or cross-thread issues (IMG:style_emoticons/default/idea.gif)
Considering this, but have heard somewhere that the 2.0 heads have less heat dissipating ability around the plugs, which is further diminished with the inserts. But I am thinking, really, how much material could you loose?
If that's a concern, Time-Sert sells copper inserts that transfer heat better.

QUOTE(jeffdon @ Aug 2 2012, 11:10 AM) *
...The cam and lifters are new, the springs are standard, running brad penn oil, so unless I got a flawed cam, what would cause such rapid wear?
How did you originally break-in the engine? (2,500RPM for 20 minutes?)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
ChrisFoley
post Aug 2 2012, 12:27 PM
Post #20


I am Tangerine Racing
*****

Group: Members
Posts: 7,925
Joined: 29-January 03
From: Bolton, CT
Member No.: 209
Region Association: None
QUOTE(jeffdon @ Aug 2 2012, 01:10 PM) *

QUOTE(Racer Chris @ Aug 2 2012, 10:02 AM) *

Its even worse when the cam goes flat in less than 80 miles. (IMG:style_emoticons/default/unsure.gif)
It happens.


The cam and lifters are new, the springs are standard, running brad penn oil, so unless I got a flawed cam, what would cause such rapid wear?

In the case I mentioned, it was a combination of high spring pressures and improperly hardened lifters against a fairly high lift cam.

If you got 8K miles already and you're using Brad Penn, I doubt you have a flat cam.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

2 Pages V  1 2 >
Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Standard · Switch to: Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 17th May 2024 - 04:20 PM
Invision Power Board v9.1.4 © 2024  IPS, Inc.
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 ...