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The Terminator
Terminator Talk
Lower Crank Pulley Bushings: Polyurethane or Silicone?
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<blockquote data-quote="wurd2" data-source="post: 14960434" data-attributes="member: 15196"><p>As part of my Mach1 rebuild project with a terminator engine, we're rebuilding the lower crank pulley component. Since this component's rubber bushings are no longer available from Ford (lame), we decided to get some material from <a href="http://www.mcmaster.com" target="_blank">McMaster-Carr</a> and cut our own bushings.</p><p></p><p>I found two ideal tubes with the right diameters, one being polyurethane (part 87235K12) and the other being extreme-temperature silicone rubber (part 5546T56).</p><p></p><p>Both of these tubes have a durometer hardness of 60A (medium hard).</p><p></p><p>Taken from McMaster-Carr's site, here's some relevant information about their polyurethane:</p><p></p><p><span style="font-size: 15px"><span style="font-family: 'courier'">Temperature Range: -20° to 185°F</span></span></p><p><span style="font-size: 15px"><span style="font-family: 'courier'">Tensile Strength: 40A tubes are 850 psi; 60A tubes are 4000 psi; 80A and 95A tubes are 6500 psi; 90A tubes are 5500 psi; 75D tubes are 7500 psi</span></span></p><p><span style="font-size: 15px"><span style="font-family: 'courier'">Use indoors</span></span></p><p></p><p>And here's some information for the extreme-temperature silicone rubber:</p><p></p><p><span style="font-size: 15px"><span style="font-family: 'courier'">Temperature Range: -60° to 500° F</span></span></p><p><span style="font-size: 15px"><span style="font-family: 'courier'">Tensile Strength: 700 psi</span></span></p><p></p><p>I'm leaning towards the polyurethane, but I'm somewhat concerned about the indoor use and lower temperature rating.</p><p></p><p>Anyone have any opinions or recommendations?</p></blockquote><p></p>
[QUOTE="wurd2, post: 14960434, member: 15196"] As part of my Mach1 rebuild project with a terminator engine, we're rebuilding the lower crank pulley component. Since this component's rubber bushings are no longer available from Ford (lame), we decided to get some material from [url=http://www.mcmaster.com]McMaster-Carr[/url] and cut our own bushings. I found two ideal tubes with the right diameters, one being polyurethane (part 87235K12) and the other being extreme-temperature silicone rubber (part 5546T56). Both of these tubes have a durometer hardness of 60A (medium hard). Taken from McMaster-Carr's site, here's some relevant information about their polyurethane: [size=4][font=courier]Temperature Range: -20° to 185°F Tensile Strength: 40A tubes are 850 psi; 60A tubes are 4000 psi; 80A and 95A tubes are 6500 psi; 90A tubes are 5500 psi; 75D tubes are 7500 psi Use indoors[/font][/size] And here's some information for the extreme-temperature silicone rubber: [size=4][font=courier]Temperature Range: -60° to 500° F Tensile Strength: 700 psi[/font][/size] I'm leaning towards the polyurethane, but I'm somewhat concerned about the indoor use and lower temperature rating. Anyone have any opinions or recommendations? [/QUOTE]
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Lower Crank Pulley Bushings: Polyurethane or Silicone?
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