 Valve clearance with Chrome Moly Pushrods, Please confirm the clearance is to be ZERO |
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| jjs3rd914 |
 Aug 22 2018, 09:07 AM
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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 |
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| ClayPerrine |
Aug 24 2018, 01:07 PM
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Life's been good to me so far..... Group: Admin Posts: 16,315 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille 
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The only time you should run 0 lash is when you run steel pushrods. The expansion rate on steel pushrods is the same as the cylinders, so they don't tighten up as they get hot.
When running the stock aluminum pushrods, you need to run factory valve lash settings. It accounts for the fact that aluminum expands more than steel when heated, so when your engine running aluminum pushrods is hot, it is at 0 lash. That's why you have to set the valve when the engine is dead cold. |
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Posts in this topic
jjs3rd914 Valve clearance with Chrome Moly Pushrods Aug 22 2018, 09:07 AM
76-914 "0" clearance :beer2: Aug 22 2018, 09:13 AM ClayPerrine Adjust the valves so that you can turn the swivel ... Aug 22 2018, 10:51 AM Vacca Rabite What they said.
Set it to zero. No feeler gauge. ... Aug 22 2018, 10:53 AM Mark Henry :agree: Zero,
The big thing to watch for is once ... Aug 22 2018, 11:29 AM
worn
:agree: Zero,
The big thing to watch for is once... Aug 22 2018, 01:20 PM Mark Henry
:agree: Zero,
The big thing to watch for is onc... Aug 22 2018, 02:28 PM cuddy_k Yep. Someone once called it “loose zero” which... Aug 22 2018, 12:42 PM jjs3rd914
Yep. Someone once called it “loose zero” whic... Aug 22 2018, 01:16 PM jtprettyman
Yep. Someone once called it “loose zero” whic... Aug 22 2018, 03:42 PM bbrock So how does the noise compare between aluminum PRs... Aug 22 2018, 03:30 PM Mark Henry
So how does the noise compare between aluminum PR... Aug 22 2018, 04:11 PM Jetsetsurfshop Isn't there a requirement from Webcam for the ... Aug 22 2018, 05:53 PM Vacca Rabite
Isn't there a requirement from Webcam for the... Aug 22 2018, 09:45 PM euro911 Another term often used is 'zero lash' Aug 23 2018, 12:24 AM Jetsetsurfshop Anyone have a picture of the camshaft after runnin... Aug 24 2018, 10:15 AM HAM Inc
Anyone have a picture of the camshaft after runni... Aug 24 2018, 11:53 AM euro911 Read this: https://www.dragzine.com/tech-stories/h... Aug 24 2018, 11:05 AM Jetsetsurfshop I found a picture of my camshaft. Its just over a ... Aug 24 2018, 12:20 PM euro911 That could depend on a few factors ...
What did ... Aug 24 2018, 12:52 PM |
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