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The Terminator
Suspension Modifications
Any metallurgy gurus here? Curious about IRS aluminum arms..
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<blockquote data-quote="jrgoffin" data-source="post: 10553063" data-attributes="member: 4360"><p>Yeah, I was going with the 'Permanent Mold' info right from many press releases and tech articles I dug up - they all said the same thing and none referenced sand casting. In any case, looking at the alloys, heat treatments, and temper designations, they are pretty wide-spread, so I won't know much until I hear back from the engineer at Ford. If it is the 356-T6 that was solution heat treated, they get them up to 1000F (after heating the mold to about 500F) for several hours before quench-cooling, so who knows how it all works with more heat after-the-fact.</p><p></p><p>Anyway, the bushing-burn job was simple, even on some other arms that I hit with mapp gas. Everyone mentions that the IRS cradle bushings were the pain - I had all four out pretty quick and had the bores nice and clean with the wire wheel. Worst case, I can do the same (with the drill too) on my spare lowers - just got impaitent and "burned-out", so to speak!</p><p></p><p>I do know that a company in Michigan called Benteler Engineering made the cradle and built up the IRS before it was delivered, but don't know if they were also the supplier of the arms. Hopefully more useless trivia to follow...</p></blockquote><p></p>
[QUOTE="jrgoffin, post: 10553063, member: 4360"] Yeah, I was going with the 'Permanent Mold' info right from many press releases and tech articles I dug up - they all said the same thing and none referenced sand casting. In any case, looking at the alloys, heat treatments, and temper designations, they are pretty wide-spread, so I won't know much until I hear back from the engineer at Ford. If it is the 356-T6 that was solution heat treated, they get them up to 1000F (after heating the mold to about 500F) for several hours before quench-cooling, so who knows how it all works with more heat after-the-fact. Anyway, the bushing-burn job was simple, even on some other arms that I hit with mapp gas. Everyone mentions that the IRS cradle bushings were the pain - I had all four out pretty quick and had the bores nice and clean with the wire wheel. Worst case, I can do the same (with the drill too) on my spare lowers - just got impaitent and "burned-out", so to speak! I do know that a company in Michigan called Benteler Engineering made the cradle and built up the IRS before it was delivered, but don't know if they were also the supplier of the arms. Hopefully more useless trivia to follow... [/QUOTE]
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Suspension Modifications
Any metallurgy gurus here? Curious about IRS aluminum arms..
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