Any experience with the AA forged crankshafts? |
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Any experience with the AA forged crankshafts? |
stugray |
Apr 22 2018, 10:47 AM
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#1
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Advanced Member Group: Members Posts: 3,824 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
I am looking for a good 2.0L stock crank (71mm).
It is for my race engine, so I would rather have forged than billet (like the SCAT product). Who has used a AA forged crank? Any issues? Do we know if these are brand new or reconditioned to be "new"? Anything to worry about or better options? https://aapistons.com/products/counterweigh...qxoCrTYQAvD_BwE |
zig-n-zag |
Apr 25 2018, 01:21 AM
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#2
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Member Group: Members Posts: 182 Joined: 18-May 06 From: Hawaii Member No.: 6,024 |
A 66mm crank can be made into a 71mm crank by offset grinding the rod journals.
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stugray |
Apr 25 2018, 01:44 PM
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#3
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Advanced Member Group: Members Posts: 3,824 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
A 66mm crank can be made into a 71mm crank by offset grinding the rod journals. I was wondering if I could have a 1.8L crank ground down to a 2.0L crank. If the people doing the work can add a little weld to the outside of the journals you should be able to. I have TWO 1.8L cranks (paperweights) on my shelf. |
Mueller |
Apr 25 2018, 03:39 PM
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#4
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914 Freak! Group: Members Posts: 17,146 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None |
A 66mm crank can be made into a 71mm crank by offset grinding the rod journals. I was wondering if I could have a 1.8L crank ground down to a 2.0L crank. If the people doing the work can add a little weld to the outside of the journals you should be able to. I have TWO 1.8L cranks (paperweights) on my shelf. No need to add material. The new journal has a smaller diameter and will have an axis further away from the crank centerline for the longer stroke. |
Mark Henry |
Apr 26 2018, 10:34 AM
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#5
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
A 66mm crank can be made into a 71mm crank by offset grinding the rod journals. I was wondering if I could have a 1.8L crank ground down to a 2.0L crank. If the people doing the work can add a little weld to the outside of the journals you should be able to. I have TWO 1.8L cranks (paperweights) on my shelf. No need to add material. The new journal has a smaller diameter and will have an axis further away from the crank centerline for the longer stroke. I personally wouldn't do this, to do it right it would need to be rough cut, stress relieved, green ground, heat treated and final ground to size. I may have missed some steps, one may be re-drilling oil holes for the rods. If you add the work costs up it's way cheaper to find the correct core in the first place. |
wndsrfr |
Apr 26 2018, 07:37 PM
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#6
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Senior Member Group: Members Posts: 1,429 Joined: 30-April 09 From: Rescue, Virginia Member No.: 10,318 Region Association: MidAtlantic Region |
Gotta add my experience with 80mm cranks on my 2316 before I went with the FAT new forging one. Two failures....probably attributable to poor quality control in buildup welding and also the stress cracks from oil holes ending up too close to the web.
here's the links: http://www.914world.com/bbs2/index.php?sho...=162641&hl= http://www.914world.com/bbs2/index.php?sho...=197901&hl= |
Mark Henry |
Apr 26 2018, 09:23 PM
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#7
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
Gotta add my experience with 80mm cranks on my 2316 before I went with the FAT new forging one. Two failures....probably attributable to poor quality control in buildup welding and also the stress cracks from oil holes ending up too close to the web. here's the links: http://www.914world.com/bbs2/index.php?sho...=162641&hl= http://www.914world.com/bbs2/index.php?sho...=197901&hl= I have a 78mm here that's a paperweight. I don't know who did the crank. I also have a 996 paperweight. Be thankful you're not having that bad luck with a 996, around $1500 for a good used crank. About $30k for a new engine. I can do them cheaper with a shortblock from Porsche, but still bloody expensive. M96/97 engines are keeping me busy. |
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