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Re: Iron vs. Aluminum block?
[Re: RATTRAP]
#2808793
08/14/20 10:39 AM
08/14/20 10:39 AM
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Joined: Jan 2003
Posts: 19,369
Las Vegas
Al_Alguire
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 19,369
Las Vegas
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Ill take the weight loss over the HP loss any day. As noted aluminum blocks can be made better to more even out those differences. Being Hipped and hot honed are two things that can help make a better foundation.
"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: Iron vs. Aluminum block?
[Re: Al_Alguire]
#2809174
08/15/20 11:12 AM
08/15/20 11:12 AM
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Joined: Jan 2003
Posts: 10,032
MN
JERICOGTX
OP
I Live Here
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OP
I Live Here
Joined: Jan 2003
Posts: 10,032
MN
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Well I scored a deal on a used INDY RB block. Would have preferred a low deck, but for what I paid, and got with it, I couldn’t turn it down. The block was run in a dragster, and has been refreshed a couple times. On the last refresh a rod bolt broke on the 202 pass, and the Oliver rod hit the pan rail, and bent in the shape of a horseshoe, but did not break. The guy even reused the crank, and is still running it. With the block, I got 6 Diamond pistons, and 4 Oliver rods 7.100 length. It had a 4.375 stroke crank in it, and I’ll go that way again. I’m basically going to build a duplicate of how it was before, as he ran SR heads just like mine.
69 GTX
68 Road Runner
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Re: Iron vs. Aluminum block?
[Re: JERICOGTX]
#2809186
08/15/20 11:47 AM
08/15/20 11:47 AM
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Joined: Jan 2004
Posts: 8,282
fredericksburg,va
cudaman1969
master
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master
Joined: Jan 2004
Posts: 8,282
fredericksburg,va
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Well I scored a deal on a used INDY RB block. Would have preferred a low deck, but for what I paid, and got with it, I couldn’t turn it down. The block was run in a dragster, and has been refreshed a couple times. On the last refresh a rod bolt broke on the 202 pass, and the Oliver rod hit the pan rail, and bent in the shape of a horseshoe, but did not break. The guy even reused the crank, and is still running it. With the block, I got 6 Diamond pistons, and 4 Oliver rods 7.100 length. It had a 4.375 stroke crank in it, and I’ll go that way again. I’m basically going to build a duplicate of how it was before, as he ran SR heads just like mine. I have a set of 4.5 pistons that I would sell. 6.76 Eagle rods too, both for a 4.15 crank. I need 4.53 pistons.
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Re: Iron vs. Aluminum block?
[Re: JERICOGTX]
#2809193
08/15/20 11:56 AM
08/15/20 11:56 AM
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Joined: Jan 2003
Posts: 2,924
A shed in England
Tig
master
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master
Joined: Jan 2003
Posts: 2,924
A shed in England
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Just for info, I went from a 528 Mega block (steel rods), to a 572 KB (steel rods) and the car weighed 70lbs less.Then went from the 572 to a 655 Indy block (alloy rods) with T/R and the car weighed 30lb more.
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge.
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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Re: Iron vs. Aluminum block?
[Re: sasquatch]
#2809208
08/15/20 12:35 PM
08/15/20 12:35 PM
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Joined: Jan 2003
Posts: 10,032
MN
JERICOGTX
OP
I Live Here
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OP
I Live Here
Joined: Jan 2003
Posts: 10,032
MN
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Be careful with the repair on this. That looks pretty straight forward but notice the cracking going back to the cap bolts? Up and over the pan rail? LOOKS like the crack also extends further up into the skirt that it first appears. Could just be the photo. NOT saying it cannot be fixed but perhaps more than it appears. Interesting that I fixed a NON windowed Indy block about a year ago that was cracked very similarly.
Todd Todd, I have the dyes and stuff needed for checking the cracks. This is a long term project, and I’m in no rush to build it. I can have it welded by a coworker, that is one of the best welders I’ve met. Him and I discussed it before I bought it. Even if it ends up as a coffee table stand, I have next to nothing into it.
69 GTX
68 Road Runner
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Re: Iron vs. Aluminum block?
[Re: JERICOGTX]
#2809279
08/15/20 03:42 PM
08/15/20 03:42 PM
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Joined: Oct 2007
Posts: 4,207
New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,207
New York
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I remember reading somewhere about welding an aluminum casting, but no results.
To locate the stop drill hole: it should be (obviously) in line with the crack, but 1 drill diameter farther into the "good" material after the visible end of the crack. Sounds like anticipating the crack has an effect under the surface?
Anyone heard of this?
Boffin Emeritus
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Re: Iron vs. Aluminum block?
[Re: tboomer]
#2809317
08/15/20 08:22 PM
08/15/20 08:22 PM
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Joined: Dec 2012
Posts: 1,824
Wind Gap,Pa.
Sammy
top fuel
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top fuel
Joined: Dec 2012
Posts: 1,824
Wind Gap,Pa.
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The wife saw that on farcebook this morning Jeff...Cool. Did you get the broken piece with the engine? My mega block thread went south fairly quickly.
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Re: Iron vs. Aluminum block?
[Re: Sammy]
#2809323
08/15/20 09:16 PM
08/15/20 09:16 PM
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Joined: Jan 2003
Posts: 10,032
MN
JERICOGTX
OP
I Live Here
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OP
I Live Here
Joined: Jan 2003
Posts: 10,032
MN
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The wife saw that on farcebook this morning Jeff...Cool. Did you get the broken piece with the engine? My mega block thread went south fairly quickly. No broken pieces. I can have a piece CNC made at work to fit.
69 GTX
68 Road Runner
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Re: Iron vs. Aluminum block?
[Re: JERICOGTX]
#2809340
08/15/20 10:47 PM
08/15/20 10:47 PM
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Joined: Aug 2003
Posts: 4,682
On the parachute mount
n20mstr
master
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master
Joined: Aug 2003
Posts: 4,682
On the parachute mount
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Be careful with the repair on this. That looks pretty straight forward but notice the cracking going back to the cap bolts? Up and over the pan rail? LOOKS like the crack also extends further up into the skirt that it first appears. Could just be the photo. NOT saying it cannot be fixed but perhaps more than it appears. Interesting that I fixed a NON windowed Indy block about a year ago that was cracked very similarly.
Todd Todd, I have the dyes and stuff needed for checking the cracks. This is a long term project, and I’m in no rush to build it. I can have it welded by a coworker, that is one of the best welders I’ve met. Him and I discussed it before I bought it. Even if it ends up as a coffee table stand, I have next to nothing into it. If you not going to use it ? ? Let me know I might buy it off you
....BAD A$$ STREET CAR.....
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Re: Iron vs. Aluminum block?
[Re: n20mstr]
#2809396
08/16/20 09:05 AM
08/16/20 09:05 AM
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Joined: Jan 2003
Posts: 10,010
Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,010
Frostbitefalls MN (Rocky&Bullw...
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Great score on the block and parts Jeff. Since you aren't planning on pushing it real hard, i am optimistic on any power loss being insignificant. But wieght transfer due to losing all that wieght up front is a big deal. I see the combo as a great improvement.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Iron vs. Aluminum block?
[Re: JERICOGTX]
#2809472
08/16/20 12:52 PM
08/16/20 12:52 PM
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Joined: Feb 2014
Posts: 1,708
central il.
second 70
top fuel
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top fuel
Joined: Feb 2014
Posts: 1,708
central il.
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Be careful with the repair on this. That looks pretty straight forward but notice the cracking going back to the cap bolts? Up and over the pan rail? LOOKS like the crack also extends further up into the skirt that it first appears. Could just be the photo. NOT saying it cannot be fixed but perhaps more than it appears. Interesting that I fixed a NON windowed Indy block about a year ago that was cracked very similarly.
Todd Todd, I have the dyes and stuff needed for checking the cracks. This is a long term project, and I’m in no rush to build it. I can have it welded by a coworker, that is one of the best welders I’ve met. Him and I discussed it before I bought it. Even if it ends up as a coffee table stand, I have next to nothing into it. Gee Jeff this sounds more like a Joel bargain.
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Re: Iron vs. Aluminum block?
[Re: second 70]
#2809477
08/16/20 01:04 PM
08/16/20 01:04 PM
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Joined: Jan 2003
Posts: 10,032
MN
JERICOGTX
OP
I Live Here
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OP
I Live Here
Joined: Jan 2003
Posts: 10,032
MN
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Be careful with the repair on this. That looks pretty straight forward but notice the cracking going back to the cap bolts? Up and over the pan rail? LOOKS like the crack also extends further up into the skirt that it first appears. Could just be the photo. NOT saying it cannot be fixed but perhaps more than it appears. Interesting that I fixed a NON windowed Indy block about a year ago that was cracked very similarly.
Todd Todd, I have the dyes and stuff needed for checking the cracks. This is a long term project, and I’m in no rush to build it. I can have it welded by a coworker, that is one of the best welders I’ve met. Him and I discussed it before I bought it. Even if it ends up as a coffee table stand, I have next to nothing into it. Gee Jeff this sounds more like a Joel bargain. Joel was the first person I called on my way home from picking it up. Had to tell him I finally know how it feels to get a “Joel deal”. Greg, I bought the block from Bruce K. It’s one he ran in his dragster. He said it was just faster to buy a new block vs. fixing this one. Gene Pearson does his machine work. I trust both of them, that it’s still a decent block.
69 GTX
68 Road Runner
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Re: Iron vs. Aluminum block?
[Re: polyspheric]
#2809503
08/16/20 02:46 PM
08/16/20 02:46 PM
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Joined: Sep 2003
Posts: 19,449
north of coder
moparx
"Butt Crack Bob"
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"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,449
north of coder
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I remember reading somewhere about welding an aluminum casting, but no results.
To locate the stop drill hole: it should be (obviously) in line with the crack, but 1 drill diameter farther into the "good" material after the visible end of the crack. Sounds like anticipating the crack has an effect under the surface?
Anyone heard of this? yes. this is the same for all materials that need crack repair. a generous V on both sides of the crack [if possible] is also necessary for an adequate repair. avoid grinding the weld as well. [unless absolutely necessary !] 
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Re: Iron vs. Aluminum block?
[Re: moparx]
#2810054
08/18/20 07:39 AM
08/18/20 07:39 AM
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Joined: Jan 2003
Posts: 10,032
MN
JERICOGTX
OP
I Live Here
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OP
I Live Here
Joined: Jan 2003
Posts: 10,032
MN
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Dropped the block off at the machinist yesterday, and he said the block is a simple fix. Looks like I'll be building a 562ci engine now.
69 GTX
68 Road Runner
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