Valve Train mods, While I am in there...... |
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Valve Train mods, While I am in there...... |
jeffdon |
Aug 1 2012, 01:45 PM
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#1
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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? |
TheCabinetmaker |
Aug 1 2012, 01:52 PM
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#2
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I drive my car everyday Group: Members Posts: 8,304 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. |
jeffdon |
Aug 1 2012, 02:00 PM
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#3
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Senior Member Group: Members Posts: 1,094 Joined: 24-October 06 From: oakland, ca Member No.: 7,087 Region Association: None |
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TheCabinetmaker |
Aug 1 2012, 02:07 PM
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#4
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I drive my car everyday Group: Members Posts: 8,304 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.
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jeffdon |
Aug 1 2012, 02:10 PM
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#5
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Senior Member Group: Members Posts: 1,094 Joined: 24-October 06 From: oakland, ca Member No.: 7,087 Region Association: None |
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? |
McMark |
Aug 1 2012, 02:43 PM
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#6
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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. |
jeffdon |
Aug 1 2012, 02:47 PM
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#7
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Senior Member Group: Members Posts: 1,094 Joined: 24-October 06 From: oakland, ca Member No.: 7,087 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. Good point, Mark. What would your take be on used 911 adjusters if I can find them? |
Katmanken |
Aug 1 2012, 02:50 PM
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#8
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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 |
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McMark |
Aug 1 2012, 03:33 PM
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#9
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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.
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Valy |
Aug 1 2012, 03:44 PM
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#10
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Senior Member Group: Members Posts: 1,677 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.
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jeffdon |
Aug 1 2012, 08:26 PM
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#11
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Senior Member Group: Members Posts: 1,094 Joined: 24-October 06 From: oakland, ca Member No.: 7,087 Region Association: None |
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. |
McMark |
Aug 1 2012, 11:47 PM
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#12
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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.
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euro911 |
Aug 2 2012, 12:47 AM
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#13
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Retired & living the dream. God help me if I wake up! Group: Members Posts: 8,851 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) |
jeffdon |
Aug 2 2012, 07:34 AM
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#14
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Senior Member Group: Members Posts: 1,094 Joined: 24-October 06 From: oakland, ca Member No.: 7,087 Region Association: None |
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? |
Valy |
Aug 2 2012, 08:48 AM
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#15
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Senior Member Group: Members Posts: 1,677 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. 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. |
jeffdon |
Aug 2 2012, 09:00 AM
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#16
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Senior Member Group: Members Posts: 1,094 Joined: 24-October 06 From: oakland, ca Member No.: 7,087 Region Association: None |
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. |
ChrisFoley |
Aug 2 2012, 11:02 AM
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#17
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I am Tangerine Racing Group: Members Posts: 7,934 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. |
jeffdon |
Aug 2 2012, 12:10 PM
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#18
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Senior Member Group: Members Posts: 1,094 Joined: 24-October 06 From: oakland, ca Member No.: 7,087 Region Association: None |
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? |
euro911 |
Aug 2 2012, 12:16 PM
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#19
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Retired & living the dream. God help me if I wake up! Group: Members Posts: 8,851 Joined: 2-December 06 From: So.Cal. & No.AZ (USA) Member No.: 7,300 Region Association: Southern California |
... 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?...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?) |
ChrisFoley |
Aug 2 2012, 12:27 PM
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#20
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I am Tangerine Racing Group: Members Posts: 7,934 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. 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. |
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