 Valve lash, With WEBCAM #494 |
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| jeffdon |
 Mar 13 2010, 06:09 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  |
Ran the 2056 on the stand for a last time to get the oil warm, and do the initial change, and get her ready for installation. Did another valve check. Which got me to thinking.
I am setting it to the spec that came with the cam, .006 for both exhaust and intake. Lift (.465) and duration (280 deg.) are the same for both valves. Question is, if exhaust valves expand more due to heat than intake, why does webcam recommend .006 for both? Why not .006 and .008 as is standard? It SEEMS to be running pretty well, but I know i have a good deal of fooling around with jets and such once its on the road and i can test her under load. At one point at about 3500 rpm it started firing back through No 4., but that was right about the time i was running out of gas in my temp. tank. I shut it off, and got a big pop and some flame out the tail pipe. I would really like address/double check anything now, as its way easier accesing things on the stands. |
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| Cap'n Krusty |
Mar 14 2010, 09:38 AM
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#2
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
The .008" number is specified ONLY for T4 engines with Sodium filled exhaust valves. All others use .006 for stock setups, or what the camshaft or pushrod manufacturer recommends.
The Cap'n |
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| jeffdon |
Mar 14 2010, 11:06 AM
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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 |
QUOTE(Cap'n Krusty @ Mar 14 2010, 07:38 AM)  The .008" number is specified ONLY for T4 engines with Sodium filled exhaust valves. All others use .006 for stock setups, or what the camshaft or pushrod manufacturer recommends. The Cap'n Hey Cap'n - So you would not go with the "run em loose" for break in advise??? |
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| Cap'n Krusty |
Mar 14 2010, 08:28 PM
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#4
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
QUOTE(jeffdon @ Mar 14 2010, 10:06 AM) QUOTE(Cap'n Krusty @ Mar 14 2010, 07:38 AM) The .008" number is specified ONLY for T4 engines with Sodium filled exhaust valves. All others use .006 for stock setups, or what the camshaft or pushrod manufacturer recommends. The Cap'n Hey Cap'n - So you would not go with the "run em loose" for break in advise??? I run'em where they're supposed to be, whatever that is for the particular application. After cranking for oil pressure with the plugs out, I run pushrod engines for 20-30 minutes at 1500-2000 RPM, then fine tune the carbs and timing before shutting it down and allowing it to cool down for 3-4 hours. I then check and adjust the valves before installing the engine. On FI engines I do the same thing, only in the car. The Cap'n |
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Posts in this topic
jeffdon Valve lash Mar 13 2010, 06:09 PM
Al Meredith I think the board would like to know what kind of ... Mar 13 2010, 06:25 PM
jeffdon
I think the board would like to know what kind of... Mar 13 2010, 11:42 PM Vacca Rabite Stock pushrods? Are you sure your geometry is rig... Mar 14 2010, 12:17 AM jeffdon
Stock pushrods? Are you sure your geometry is ri... Mar 14 2010, 08:48 AM ME733 ...........well I guess some of the other engine e... Mar 14 2010, 07:46 AM jeffdon
...........well I guess some of the other engine ... Mar 14 2010, 08:50 AM ME733
...........well I guess some of the other engine... Mar 14 2010, 09:07 AM Don M If you really want to know whats going on with you... Mar 14 2010, 11:16 AM Jake Raby I'd expect that you didn't carry out any v... Mar 14 2010, 07:10 PM jeffdon
I'd expect that you didn't carry out any ... Mar 16 2010, 09:53 AM Vacca Rabite
I'd expect that you didn't carry out any... Mar 16 2010, 10:37 AM Jake Raby
I'd expect that you didn't carry out any... Mar 16 2010, 07:08 PM Jake Raby Running loose retards valve timing events and wear... Mar 15 2010, 10:36 PM Cap'n Krusty I confess to knowing that loose valve settings als... Mar 16 2010, 09:07 AM Vacca Rabite
I confess to knowing that loose valve settings al... Mar 16 2010, 09:24 AM vsg914
I confess to knowing that loose valve settings a... Mar 16 2010, 09:27 AM brant Zach,
I apologize for not using the search featu... Mar 16 2010, 05:21 PM Vacca Rabite
Zach,
I apologize for not using the search feat... Mar 16 2010, 09:19 PM jeffdon Allrighty, will devise a nice mount for my dial in... Mar 17 2010, 09:19 AM jeffdon Allrighty, check it out. No 3 exhaust, half way t... Mar 20 2010, 01:45 PM rtalich
Allrighty, check it out. No 3 exhaust, half way ... Mar 22 2010, 12:47 PM jeffdon
Allrighty, check it out. No 3 exhaust, half way... Mar 24 2010, 09:18 AM McMark :unsure: Mar 20 2010, 02:58 PM jeffdon
:unsure:
Too far out to run as is? Also, I did... Mar 20 2010, 03:27 PM brant Jeff,
any chance you have a link to the article?... Mar 20 2010, 06:18 PM Jake Raby The procedure should be done at zero lash. Also, t... Mar 20 2010, 08:05 PM jeffdon Not to question your experience, Jake, of which i ... Mar 21 2010, 01:16 PM Jake Raby
Not to question your experience, Jake, of which i... Mar 21 2010, 01:27 PM jeffdon
Not to question your experience, Jake, of which ... Mar 21 2010, 01:54 PM |
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