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Registered
Join Date: Mar 2004
Location: Texas
Posts: 15
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SSI heat exchanger dilemma!!!
I'm planning to invest in a set of SSI heat exchangers soon, given the claims, a set that I hope to have a long time. Initially they will go on a 73S spec engine I'm building up. However, in the next 12-18 months I would like to upgrade to a 80-83 SC and want to transfer these to that car. Question is, given that criteria, what model SSI do I buy?
Do I buy the thin flange with the O2 sensor installed and plan later to shim the longer SC studs to make them fit, or do I buy the later model thick flange and change to longer studs on the early engine? As far as I see, these are the only differences? Thanks in advance to all you gurus out there for the advice...  Fred |
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04-01-2004, 09:28 AM
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SCWDP- Shock and Awe Dept
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Doesn't the SC use thin flange?
Are you upgrading to a SC, or an SC engine? If a SC, get the o2 equipped exchange if you have to deal w/ smog inspections, otherwise don't worry about the o2 sensor.
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Ryan Williams, SCWDP '81 911SC Targa 3.6 '81 911SC Coupe 3.2 #811 '64 VW Camper Bus, lil' Blue |
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04-01-2004, 09:57 AM
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Registered
Join Date: Feb 2003
Location: Hollywoodland
Posts: 468
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SC's have both thin and thick flanges. I had thin on mine.
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04-01-2004, 10:05 AM
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Registered
Join Date: Mar 2001
Location: Marysville Wa.
Posts: 22,470
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78/79 is thin. replacing all the studs on the 73 would be an ordeal, unless you have the heads off and use a drill jig. they don't just unscrew.
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https://www.instagram.com/johnwalker8704 8009 103rd pl ne Marysville Wa 98270 206 637 4071 |
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04-01-2004, 10:10 AM
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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,189
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it's easier to make long-studs shorter, than it is to make short-studs longer.
=> go with the thin-flanged. a stack of washers can make make long-studs (effectively) shorter.
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong. Disclaimer: the above was 2¢ worth. More information is available as my professional opinion, which is provided for an exorbitant fee. 
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04-01-2004, 10:13 AM
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Registered
Join Date: Feb 2004
Location: Copenhagen, Denmark
Posts: 433
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I would say go with thin flange like island911.
As I recall both the '73 and SC are using short studs. As for O2 sensor, I don't know but again it's easier to plug a unused hole than drill one and weld in a nut/thread for the sensor. I bought my thinflange SSI for my SC but later upgraded to Carrera 3.2L engine, transfered the SSI's using lots of washers. With Dansk sportmuffler it's sounds sooooo good.
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You might not be happier owning a Porsche, but it certainly feels so driving one |
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04-01-2004, 11:25 PM
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1981 Porsche 911SC Targa 3.6
