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Registered
Join Date: Jan 2005
Location: north america
Posts: 2,228
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Headstuds for 2.7 magnesium case
Hello
I’ve done a fair amount of reading in this topic but still come up Confused. Are the preferred cylinder head stud for a magnesium case 2.7 steel head studs. So I was considering 993 steel studs but also see 993tt studs which I think are dilivar studs. I know there’s lots of options, just looking for a set up that works And not fancy. Case has case savers installed. If your running steel head studs on your 2.7 please share. How are things holding up. |
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06-27-2018, 11:14 AM
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Join Date: Jul 2005
Location: Atlanta
Posts: 1,241
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The steel head studs are fine, but have case savers installed. I wouldn't bother with 993 studs.
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No physical quantity completely explains its own existence |
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06-27-2018, 11:19 AM
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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,125
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Reading up on what 'chris_seven' stated, I'd use Dilavar for mag cases.
He wrote a very detailed analysis on studs and how they react during heat cycling under my stud thread. Very insightful. I have an aluminum case, so I would use the ARP or Supertech ones, which do not expand at the same rate as aluminum, but seems not to be an issue with the stud bosses of the case (thread pullout). For now, I have 993TT studs, and Henry Wiener states these are great all around for every case (if I am not misconstruing his words). Only reason I considered ARP or Supertech is because I am boosted and needs a lot more clamping force.
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Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR P & C's, 993SS cams, Borg-Warner S366 turbo @ 1.2-1.5 bar, depending on mood  , Treadstone full bay IC, 70mm TB, TiAL F46 WG, HKS 1 1/2" BOV, twin 044 pumps, MicroSquirt AMP'd w/GM smart coilpack, Bilstein coilovers, Tramont wheels (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel
Last edited by Tippy; 06-27-2018 at 11:57 AM.. |
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06-27-2018, 11:55 AM
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Location: north america
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Thank you for the replies. I’m honestly leaning towards steel studs.
I know I read about the expansion rate of the steel vs dilivar studs and dilivar being a better match For magnesium and aluminum. Just my experience with a 2.2 and 2.4, both being simple steel cylinder head studs and they were just fine. I’m going to keep things simple and see if I run into any problems. A main priority is keeping the 2.7 as cool as possible, multiple oil cooler if needed. I’ll see if that helps . I don’t know, maybe I’m wrong |
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06-27-2018, 02:22 PM
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Registered
Join Date: Oct 2008
Location: Nash County, NC.
Posts: 8,481
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It really has to do with the expansion of the aluminum 2.7 cylinders that steel couldn’t control causing the pulling of the magnesium of the case.
Bruce |
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06-27-2018, 05:08 PM
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