Re: Magnaflux and why we recommend it.
[Re: Performance Only]
#1258432
06/29/12 09:29 AM
06/29/12 09:29 AM
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Joined: Jan 2003
Posts: 10,081 Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,081
Frostbitefalls MN (Rocky&Bullw...
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Those who don't mag their cranks may live to drive over one- not a good thing. After one major failure which took out a block, pan, rollercam, two rods and pistons, I check them every time they come out of the block. I found a small crack in an aftermarket crank with 100 runs on it, which surprised me.
8.582, 160.18 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Magnaflux and why we recommend it.
[Re: Gumbydammit]
#1258434
06/29/12 10:44 AM
06/29/12 10:44 AM
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Joined: Jul 2010
Posts: 2,091 Delray beach, Florida
Performance Only
OP
top fuel
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OP
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Joined: Jul 2010
Posts: 2,091
Delray beach, Florida
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i don't know the full history of the crank in question. it's a factory forged 440 crank. i was told it had been in a motor that was sprayed with NO2. i don't know how much or how often though. the plan was to use it in a fairly mild low deck combo after cutting the mains and counterweights down. i sure can't blame a 40+ year old crank for finally giving out after being abused. i'm just glad the owner let us check it out before doing a bunch of work to it. no harm, no foul, we found a good useable crank for his project.
machine shop owner and engine builder
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Re: Magnaflux and why we recommend it.
[Re: Performance Only]
#1258435
06/29/12 10:57 AM
06/29/12 10:57 AM
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Anonymous
Unregistered
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Anonymous
Unregistered
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This is part of what shows that a builder cares and taking the time to post pics and discuss the issues is a big plus in my book.
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Re: Magnaflux and why we recommend it.
[Re: tboomer]
#1258437
06/29/12 11:13 AM
06/29/12 11:13 AM
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Joined: Jun 2003
Posts: 9,225 Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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this reminds me of when i first met Dan. I showed up with boxes of junk parts and he wouldn't let me leave till all the parts were checked out so he didn't have to make the dreaded, "yours parts are junk" call
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: Magnaflux and why we recommend it.
[Re: sixpackgut]
#1258438
06/29/12 11:24 AM
06/29/12 11:24 AM
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Joined: Jul 2010
Posts: 2,091 Delray beach, Florida
Performance Only
OP
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OP
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Joined: Jul 2010
Posts: 2,091
Delray beach, Florida
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Quote:
this reminds me of when i first met Dan. I showed up with boxes of junk parts and he wouldn't let me leave till all the parts were checked out so he didn't have to make the dreaded, "yours parts are junk" call
Ray, they weren't "junk" parts, just what i call "questionable". i remember looking at the crank though and spotted something right away. in the grinder it went for verification. i remember it like it was yesterday saying "yep, that's not good". but it got taken care of then and there. i really do hate to make those calls after the fact. i think your combo turned out pretty good when it was all said and done. ya just have to love those success stories, thanks for the positive comments guys. i'm very passionate about what we do and want to do the best job possible to ensure our customers success. after all, our success always has and always will hinge on our customers success.
machine shop owner and engine builder
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Re: Magnaflux and why we recommend it.
[Re: Tom Fox]
#1258443
06/29/12 10:42 PM
06/29/12 10:42 PM
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Joined: Jul 2006
Posts: 382 Roseville MN
72swgnr
enthusiast
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enthusiast
Joined: Jul 2006
Posts: 382
Roseville MN
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Dan what current do you use? AC or DC? DC can pick up shallow sub-surface indications while AC will normally only pick up indications that are open to the surface. Also product do you use to check alluminum heads/rods? I know alot of people have seen Magnaflux red dye penetrant but I'm willing to bet very few have seen flourecent penetrant which is actually way more sensitive then mag particle depending on the level of penetrant you use. Just to give you guys who are interested an idea how the magnaflux works. You have a few different ways you can magnatize a part. 1. you can use a hand yoke. The advantage of these is they are portable and can get into smaller areas. You can use a yoke for pretty much any part you want to mag. but you can only cover a 6" area at a time. The second way of magnatizing a part is to use a magnaflux bench. The advantage of these are you can control the amount of amperage that you put into a part. You also can magnetize a whole part at once which saves time and money if you have multiple parts to do. Third way is you can use another type of magnaflux machine that uses cables. (kind of like welding cables) The advantage of these is they are fairly portable and can do very large parts. Now for how the process works its pretty simple you magnetize a part while applying flourescent particles. These particles are made up of kerosene/water and iron. If there is a crack in the part it will break the magentic field and cause the flourescent particles to line up along the break, when this happens you get indications that look like the pictures that Dan posted.
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Re: Magnaflux and why we recommend it.
[Re: FastOne]
#1258446
06/30/12 06:53 AM
06/30/12 06:53 AM
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Joined: Feb 2007
Posts: 2,578 sweden
1Fast340
master
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master
Joined: Feb 2007
Posts: 2,578
sweden
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good post and cool to see a pic of it broken in 3 places thats quite bad,or good that it didnt brake killing alot of other parts in the process atleast. does people/builders still weld cracked cranks?
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Re: Magnaflux and why we recommend it.
[Re: Performance Only]
#1258450
06/30/12 06:06 PM
06/30/12 06:06 PM
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Joined: Nov 2004
Posts: 2,121 sc
tjmarcus1
top fuel
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Joined: Nov 2004
Posts: 2,121
sc
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Quote:
i wonder if a should have posted this in the Question and Answer forum where their might be more interest? i didn't think about that until i got a call from a member here asking why i even posted it.
are you serious? thanks dan for posting that! Man, i thought that was what this board is for.
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Re: Magnaflux and why we recommend it.
[Re: tjmarcus1]
#1258451
07/01/12 12:09 AM
07/01/12 12:09 AM
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Joined: Jan 2003
Posts: 14,610 Not2farfromNashville, TN
Rug_Trucker
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,610
Not2farfromNashville, TN
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I think it's a good idea to put this entire thread in the Q&A forum too.
"The only thing to do for triumph of evil is for good men to do nothing"
"NUNQUAM NON PARATUS!"
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