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jjs3rd914 |
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#1
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Member ![]() ![]() Group: Members Posts: 124 Joined: 8-August 04 From: Sarasota, FL Member No.: 2,476 ![]() |
Finishing a 2056 build with new 2L head castings, new WebCam cam, etc. Valve geometry done and SAT, so have custom lenght new Chrome Moly push rods. From all the searches it seems the consensus is zero valve clearance with these push rods and we also installed new genuine 911 swivel feet adjusters.
Can we get a general consensus to confirm ZERO running valve clearance is preferred? or IF not what is the recommended clearance? Thanks jjs3rd914 |
76-914 |
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#2
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Repeat Offender & Resident Subaru Antagonist ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 13,698 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California ![]() ![]() |
"0" clearance (IMG:style_emoticons/default/beerchug.gif)
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ClayPerrine |
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#3
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Life's been good to me so far..... ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Admin Posts: 16,290 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille ![]() ![]() |
Adjust the valves so that you can turn the swivel foot with a slight drag.
That's it. No feeler gauge required. |
VaccaRabite |
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#4
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En Garde! ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Admin Posts: 13,722 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region ![]() ![]() |
What they said.
Set it to zero. No feeler gauge. Just turn it in till it JUST touches and tighten the locking nut. Zach |
Mark Henry |
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#5
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that's what I do! ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada ![]() |
(IMG:style_emoticons/default/agree.gif) Zero,
The big thing to watch for is once done the PR should still be able to spin easy. |
iankarr |
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#6
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The wrencher formerly known as Cuddy_K ![]() ![]() ![]() ![]() Group: Members Posts: 2,556 Joined: 22-May 15 From: Heber City, UT Member No.: 18,749 Region Association: Intermountain Region ![]() ![]() |
Yep. Someone once called it “loose zero” which seems like the perfect description.
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jjs3rd914 |
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#7
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Member ![]() ![]() Group: Members Posts: 124 Joined: 8-August 04 From: Sarasota, FL Member No.: 2,476 ![]() |
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worn |
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#8
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Winner of the Utah Twisted Joint Award ![]() ![]() ![]() ![]() Group: Members Posts: 3,466 Joined: 3-June 11 From: Madison, WI Member No.: 13,152 Region Association: Upper MidWest ![]() ![]() |
(IMG:style_emoticons/default/agree.gif) Zero, The big thing to watch for is once done the PR should still be able to spin easy. How bad a thing is it to set them to stock? I mean beyond that tappet sound? |
Mark Henry |
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#9
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that's what I do! ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada ![]() |
(IMG:style_emoticons/default/agree.gif) Zero, The big thing to watch for is once done the PR should still be able to spin easy. How bad a thing is it to set them to stock? I mean beyond that tappet sound? Just noise, rattle, quite loud compared to aluminum PR's. I've been doing zero for years with no ill effects, I used to run .004 but going to zero was a big difference. Both T1 and T4. |
bbrock |
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#10
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914 Guru ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains ![]() ![]() |
So how does the noise compare between aluminum PRs at stock clearance vs. chrome moly at zero clearance? It's a question I've been wanting to ask. This seemed like a good time.
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jtprettyman |
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#11
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Rust Bucket Owner ![]() ![]() Group: Members Posts: 109 Joined: 5-May 15 From: Murfreesboro Tennessee Member No.: 18,707 Region Association: South East States ![]() ![]() |
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Mark Henry |
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#12
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that's what I do! ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada ![]() |
So how does the noise compare between aluminum PRs at stock clearance vs. chrome moly at zero clearance? It's a question I've been wanting to ask. This seemed like a good time. Definitely noisier, not too bad though, price you pay for performance cam. Head work, heavier than stock springs, cam, etc., in my book CrMo pushrods are a must. I only use quality Manton PR's. There's no reason to use steel push rods on a stock engine. |
Jetsetsurfshop |
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#13
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Senior Member ![]() ![]() ![]() Group: Members Posts: 815 Joined: 7-April 11 From: Marco Island Florida Member No.: 12,907 Region Association: South East States ![]() |
Isn't there a requirement from Webcam for the valve lash?
(IMG:style_emoticons/default/poke.gif) |
VaccaRabite |
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#14
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En Garde! ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Admin Posts: 13,722 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region ![]() ![]() |
Yes. But that’s intended for stock aluminum pushrods. They heat up and expand and will keep valves from closing all the way. |
euro911 |
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#15
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Retired & living the dream. God help me if I wake up! ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 8,885 Joined: 2-December 06 From: So.Cal. & No.AZ (USA) Member No.: 7,300 Region Association: Southern California ![]() ![]() |
Another term often used is 'zero lash'
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Jetsetsurfshop |
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#16
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Senior Member ![]() ![]() ![]() Group: Members Posts: 815 Joined: 7-April 11 From: Marco Island Florida Member No.: 12,907 Region Association: South East States ![]() |
Anyone have a picture of the camshaft after running zero lash? I'm having a hard time with this spec. (IMG:style_emoticons/default/huh.gif)
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euro911 |
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#17
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Retired & living the dream. God help me if I wake up! ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 8,885 Joined: 2-December 06 From: So.Cal. & No.AZ (USA) Member No.: 7,300 Region Association: Southern California ![]() ![]() |
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HAM Inc |
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#18
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Senior Member ![]() ![]() ![]() Group: Members Posts: 846 Joined: 24-July 06 From: Watkinsville,GA Member No.: 6,499 Region Association: None ![]() |
Anyone have a picture of the camshaft after running zero lash? I'm having a hard time with this spec. (IMG:style_emoticons/default/huh.gif) Shane, I don't have pictures of cam wear when running zero lash, but I have pictures of valve seats and retainers that ran with excessive lash. That ticking sound you hear with loose valves is the valve train hammering itself. Do that at high revs on a race engine and the sound, if you could hear it, would be of the valve train beating itself to death. The cam won't wear more because of a starting lash of zero and you can always check the lash with the engine hot after setting zero cold. Not fun, but do it once if you are worried you aren't developing clearance and adjust your cold settings accordingly. |
Jetsetsurfshop |
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#19
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Senior Member ![]() ![]() ![]() Group: Members Posts: 815 Joined: 7-April 11 From: Marco Island Florida Member No.: 12,907 Region Association: South East States ![]() |
I found a picture of my camshaft. Its just over a year old.
.006 intake .008 exhaust Track car only. (IMG:style_emoticons/default/driving.gif) Is this from running lash? The Webcam folks seen it and thought I was at zero lash. (IMG:style_emoticons/default/confused24.gif) Attached thumbnail(s) ![]() |
euro911 |
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#20
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Retired & living the dream. God help me if I wake up! ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 8,885 Joined: 2-December 06 From: So.Cal. & No.AZ (USA) Member No.: 7,300 Region Association: Southern California ![]() ![]() |
That could depend on a few factors ...
What did WEB spec for valve lash for that particular cam? Correct cam break in procedure on initial start up with the correct oil? What lifters are you running? What push rods? What spring tension? |
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