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<x-charset iso-8859-1>The heads on a Type 3 run hotter than a Type 1 due to the higher oil temperatures and the airflow design. Part of the job of the heat exchangers is to "remove heat" away from the engine, not just to remove the exhaust fumes. This design is accomplished partially through the metallurgy and density of the metal. Since J-Tubes are less dense, thinner, and use metal compounds that conduct heat faster than do the heat exchangers, it is certain that you will increase the temperature below your cylinders. Not to mention, the heat exchangers on a T3 are wrapped with a heatshield mesh, so by using J-tubes, you are also sacrificing this heat-protecting mesh. If the bottom of the cylinders is protected by the larger cooling tin (as opposed to the smaller design found on earlier type 1's), this may not be as much of a problem. But regardless of cooling tins used, cylinder #3 is going to run even hotter, running a greater risk of cooking your engine. Just my two cents. Jason 68 Notch (Nadine) I proudly buy my aircooled parts and service from... The Bug Stop www.texasbugstop.com ----- Original Message ----- From: "Erkson, Toby" <toby.erkson@intel.com> To: "Type 3 Mailing List" <type3@vwtype3.org> Sent: Wednesday, January 09, 2002 5:14 PM Subject: RE: [T3] Type 3 J-Tubes. > Really? I gotta hear the reason behind this. How? > > Toby Erkson > air_cooled_nut@pobox.com > '72 VW Squareback 1.6L bored and stroked to 2.0L, Berg five-speed > '95 VW Jetta III GL 2.0L, P-Chipped, Jamex sport suspension, 2.25" > MagnaFlow exhaust > Portland, Oregon, http://www.icbm.org/ > > >-----Original Message----- > >Don't use J-Tubes on a T3. You'll cook your heads... > > ------------------------------------------------------------------- > Search old messages on the Web! Visit http://www.vwtype3.org/list/ > > </x-charset>