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Author
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Topic: Setting Lash Hot or Cold?
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662+2
Gearhead Posts: 124
From: Ontario, Canada
Registered: Jan 2003
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posted 09-12-2003 11:00 AM
   
I was told that you should set your valve lash when the engine is hot but it doesn't mention this on my spec. card it just says to set them at .22 so should set them at .20 if cold or warm engine up first and set according to the spec card?
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Tea'sGrabber
Gearhead Posts: 276
From: Seattle, Wash.
Registered: Feb 2003
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posted 09-12-2003 11:03 AM
set them hot!!!!!! you can rough them in cold..... but the engine temp and metal expansion makes a BIG difference..... ------------------
Todd 71 Mav Grabber All orig 306 cu.in. Cast Iron heads. Carillo Rods.Best et. 10.71 @ 124 thru the mufflers.
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662+2
Gearhead Posts: 124
From: Ontario, Canada
Registered: Jan 2003
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posted 09-12-2003 12:05 PM
That is what I was told but we were not 100% sure I guess I will set them again Thank you 
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Tea'sGrabber
Gearhead Posts: 276
From: Seattle, Wash.
Registered: Feb 2003
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posted 09-12-2003 12:11 PM
If this is a new motor....... It'll require them to be checked again after a few good runs.... Is it a roller or flat tappet???------------------
Todd 71 Mav Grabber All orig 306 cu.in. Cast Iron heads. Carillo Rods.Best et. 10.71 @ 124 thru the mufflers.
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Mario428
Journeyman Posts: 76
From: Charlottetown, PEI, Canada
Registered: Nov 2001
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posted 09-12-2003 01:09 PM
Easiest thing to do is to set them a few thou tight cold, then start engine and get it up to operating temp. Pull 1 cover and set both valves on 1 cyl, eg # 1.
Let the engine cool down and recheck the valves you have just set to see how much they change. Use that number and set valves cold after that.
Problem with setting valves hot is especially with aluminum heads you have to be really quick to get them all the same because the heads are losing temp quickly.
Room temp engine does not change temp at all while setting valves.
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kid vishus
Gearhead Posts: 6098
From: middle of NC
Registered: Oct 2000
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posted 09-12-2003 01:14 PM
I always set mine cold. It's a chore to get my covers off, and then, with the stud girdle in place, setting lash isn't a picnic either. I was told by a reputable member of this forum that on an iron headed motor, they tighten up once the motor warms up. He claimed depending on the quality of springs and rocker arms, they will tighten up .001 to .003. Since I like to run mine "tight", I set them cold at what the card calls for "hot."
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662+2
Gearhead Posts: 124
From: Ontario, Canada
Registered: Jan 2003
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posted 09-12-2003 01:15 PM
I don't have aluminum heads and the engine is broke in this is the first check since it was broke in.
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70coupe
Gearhead Posts: 459
From: Toronto,Ontario,Canada
Registered: Aug 2000
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posted 09-12-2003 09:55 PM
.022 cold will be fine Floyd, I always set mine cold as well. When they warm up the lash will tighten about .002 or so but nothing to worry about. Next time you have the covers off set them at .024 cold and see if your ET's change.
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bluestreek
Gearhead Posts: 1724
From: Athens,GA
Registered: Jul 2001
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posted 09-13-2003 02:13 AM
Crane has a nice page about lash adjustments. It pretty much backs up what these guys have said.http://www.cranecams.com/mliftfaq.htm ------------------
1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank and girdle, 5.4 H-beams, Forged slugs, TFS alum. heads, ported Stealth 8020 intake, Xtreme 274 Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi.
11.86 @ 116 mph (7.62 @ 93 mph)full street trim!
DanH
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V8 Thumper
Gearhead Posts: 4377
From: Arizona
Registered: Dec 2001
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posted 09-13-2003 08:46 AM
Setting my lash (hot) at .022 with aluminum heads on an iron block, they shrink to .017 when cold. I set the hot lash on one head as fast as I can, fire it up to get it back up to running temp, and set the other head. Like Mario said, aluminum heads shed heat very quickly.------------------
1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9" All Blue Oval, no blue bottle
http://mustangsandmore.50megs.com/V8Thumper.html
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662+2
Gearhead Posts: 124
From: Ontario, Canada
Registered: Jan 2003
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posted 09-15-2003 10:19 AM
Thank you for the input
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