Aluminum motor growth
#2426895
01/01/18 01:59 AM
01/01/18 01:59 AM
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Joined: Jun 2003
Posts: 9,225
Charleston
sixpackgut
OP
Drag Week Mod Champion
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OP
Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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If an iron block aluminum head growth is roughly .006 what might one expect out of an all aluminum engine?
Gen 3 power 6.22@110, 9.85@135
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performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: Aluminum motor growth
[Re: sr440]
#2426986
01/01/18 11:13 AM
01/01/18 11:13 AM
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Joined: Nov 2004
Posts: 7,274
s.w.fl
bonefish
master
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master
Joined: Nov 2004
Posts: 7,274
s.w.fl
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They don't grow Ray. They expand........ If they were to grow they would get old............
they do get old.i have al block and heads,just the valve lash grows from 8 thou to 20 thou.
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Re: Aluminum motor growth
[Re: challenger451ci]
#2427000
01/01/18 12:20 PM
01/01/18 12:20 PM
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Joined: May 2004
Posts: 12,387
Taxes & Virus's R-US, NY
Dragula
I Live Here
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I Live Here
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Posts: 12,387
Taxes & Virus's R-US, NY
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My Indy Maxx with SR heads grows about 0.0.020" at temp. Indy told me the deck height would change about 0.010" at 170F. With a 1.7 rocker, that's ~0.017" lash change. That's about what we see...
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Re: Aluminum motor growth
[Re: sixpackgut]
#2427658
01/02/18 11:53 AM
01/02/18 11:53 AM
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Joined: Jan 2003
Posts: 13,363
Marion, South Carolina [><]
an8sec70cuda
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I Live Here
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Marion, South Carolina [><]
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My KB block/MP head hemi grows about .013" cold to hot. I lash the valves at .010" cold for .023" hot.
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Re: Aluminum motor growth
[Re: sixpackgut]
#2427690
01/02/18 12:58 PM
01/02/18 12:58 PM
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Joined: Feb 2008
Posts: 714
Central TEXAS!!!!
sr4440
super stock
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super stock
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Posts: 714
Central TEXAS!!!!
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when I read " Indy told me the deck height would change about 0.010" at 170F. With a 1.7 rocker, that's ~0.017" lash change." My 1st thought is "doesn't your pushrods and valves expand also?" I know that the valves and the pushrods don't expand as much as the block (steel vs Al) but they do expand. Which is why if you run a iron block and iron head the clearance tightens up a few thousands. (iron vs steel)
Joe
Without Data, you’re just another guy with an opinion.
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Re: Aluminum motor growth
[Re: sixpackgut]
#2427748
01/02/18 02:54 PM
01/02/18 02:54 PM
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Joined: Jan 2003
Posts: 19,363
Las Vegas
Al_Alguire
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I Live Here
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Las Vegas
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All of my aluminum block/head deals have grown between .014-.018"
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: Aluminum motor growth
[Re: an8sec70cuda]
#2427760
01/02/18 03:08 PM
01/02/18 03:08 PM
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Joined: Oct 2006
Posts: 200
AB
Efidart
enthusiast
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enthusiast
Joined: Oct 2006
Posts: 200
AB
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My KB block/MP head hemi grows about .013" cold to hot. I lash the valves at .010" cold for .023" hot. Ditto.
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Re: Aluminum motor growth
[Re: Efidart]
#2427764
01/02/18 03:15 PM
01/02/18 03:15 PM
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Joined: Jun 2003
Posts: 9,225
Charleston
sixpackgut
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Drag Week Mod Champion
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OP
Drag Week Mod Champion
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Charleston
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Thinking out loud here. So compression could actually be a 1/2 point lower when warmed up
Gen 3 power 6.22@110, 9.85@135
Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: Aluminum motor growth
[Re: sr440]
#2427775
01/02/18 03:41 PM
01/02/18 03:41 PM
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Joined: Jun 2005
Posts: 6,257
gulfport, ms, west mi
rowin4
master
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master
Joined: Jun 2005
Posts: 6,257
gulfport, ms, west mi
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They don't grow Ray. They expand........ If they were to grow they would get old............
I have expanded as I got older LOL
it's ok to butt heads, just don't do it with a butthead
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Re: Aluminum motor growth
[Re: sixpackgut]
#2427782
01/02/18 03:46 PM
01/02/18 03:46 PM
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Joined: Jun 2005
Posts: 6,257
gulfport, ms, west mi
rowin4
master
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master
Joined: Jun 2005
Posts: 6,257
gulfport, ms, west mi
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On a new build , aluminum block/ aluminum heads, what would be the best gap setting for initial startup ?
it's ok to butt heads, just don't do it with a butthead
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Re: Aluminum motor growth
[Re: sr4440]
#2428058
01/03/18 12:01 AM
01/03/18 12:01 AM
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Joined: Mar 2008
Posts: 292
NY
challenger451ci
enthusiast
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enthusiast
Joined: Mar 2008
Posts: 292
NY
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when I read " Indy told me the deck height would change about 0.010" at 170F. With a 1.7 rocker, that's ~0.017" lash change." My 1st thought is "doesn't your pushrods and valves expand also?" I know that the valves and the pushrods don't expand as much as the block (steel vs Al) but they do expand. Which is why if you run a iron block and iron head the clearance tightens up a few thousands. (iron vs steel)
Joe Yes, everything expands. Steel is about 1/2 the rate of aluminum. I was only referring to the change in lash due to deck growth being about 0.017" with 1.7 rockers. There are other factors, some add lash, some reduce it. Ya gotta check it hot to know for sure where it'll end up.
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Re: Aluminum motor growth
[Re: sixpackgut]
#2428060
01/03/18 12:03 AM
01/03/18 12:03 AM
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Superfreak
Unregistered
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Superfreak
Unregistered
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Where and what are you measuring when checking for growth?
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