 Metallurgy Question on Models of Stainless Steel HE from SSI |
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| detoxcowboy |
 May 2 2010, 05:07 PM
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Senior Member  Group: Members Posts: 1,294 Joined: 30-January 08 Member No.: 8,642 Region Association: Africa  |
Curiousity seeking input on the versions regarding Metallurgy of Stainless Steel Heat Exchangers made by SSI.
One version is all Stainless Steel and another I am told Later version is also Stainless Steel but has Mild Steel Flanges. At first glance one would assume cost of stainless steel became prohibitive, but on further research both types of steel have different strength properties(stronger in different test areas) and heat conductivity properties. Does anyone know anything on this? Any concerns other than rust? |
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| ConeDodger |
May 2 2010, 05:40 PM
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Apex killer! Group: Members Posts: 24,396 Joined: 31-December 04 From: Tahoe Area Member No.: 3,380 Region Association: Northern California 
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QUOTE(detoxcowboy @ May 2 2010, 03:07 PM)  Curiousity seeking input on the versions regarding Metallurgy of Stainless Steel Heat Exchangers made by SSI. One version is all Stainless Steel and another I am told Later version is also Stainless Steel but has Mild Steel Flanges. At first glance one would assume cost of stainless steel became prohibitive, but on further research both types of steel have different strength properties(stronger in different test areas) and heat conductivity properties. Does anyone know anything on this? Any concerns other than rust? The SS flanged ones are the more desirable. Rust is the issue. I had a new set in the box and Scott Detro made me check it with a magnet before he would buy them. Then he drove up with cash in fist! |
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| SirAndy |
May 2 2010, 05:57 PM
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Resident German Group: Admin Posts: 42,469 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(detoxcowboy @ May 2 2010, 04:07 PM) I am told Later version is also Stainless Steel but has Mild Steel Flanges. You were told wrong. A few of the EARLY sets came with mild steel flanges. Most of the sets came with SS flanges ... The mild steel flanges work just fine, but they do rust if not taken care of. (IMG:style_emoticons/default/shades.gif) Andy |
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| johannes |
May 3 2010, 01:15 AM
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Club Porsche 914 France member since 2005 Group: Members Posts: 3,092 Joined: 13-January 06 From: France Member No.: 5,409 Region Association: France |
QUOTE(ConeDodger @ May 2 2010, 03:40 PM) Scott Detro made me check it with a magnet before he would buy them. Then he drove up with cash in fist! The magnet trick will tell you if the stainless steel is austenitic alloy. Ferritic aloys are magnetic and also considered as stainless, but they are not as heat resistant. http://en.wikipedia.org/wiki/Stainless_steel |
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| Tom_T |
May 3 2010, 02:56 PM
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TMI.... Group: Members Posts: 8,321 Joined: 19-March 09 From: Orange, CA Member No.: 10,181 Region Association: Southern California
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Joe - the used set of SSI's which I got for my 73 2L had the mild steel flanges (tested both magnet & old rust pitting), so I got a pair for SS flanges to put on mine from Engman on here ($50-60 IIRC ~ corrected $40 for both). If the price for the HEs is right, then it's worth getting your own SS flanges & have them welded on in place of the mild steel ones. The guys at Plaza Muffler here in Orange quoted me $40 to cut off the old & add the SS ones (in their new location - see ads in Pennysaver for 10% off).
IMHO - you're better off not having a weak point rust resistance-wise in the exhaust system, esp. if you can do the upgrade for $60+/- a side! (IMG:style_emoticons/default/smile.gif) ~ corrected to $0 per side Andy - there appears to be more than just a few of the SSI's around with the mild steel flanges, from what I'm seeing, but that may be just what's out there selling now. (IMG:style_emoticons/default/shades.gif) I stand corrected, they're only $20 per side here: (I question why it was primed if truly NOS & undamaged) If you don't do your own welding, that's $80 all in to have Plaza Muffler or someone weld them up for you. |
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