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On 30 May 99, at 18:44, Jason Mooth wrote: > Please don't take this the wrong way Jim. No offense taken; I appreciate your additional info. > I don't think that my J-pipes are "special". The exhaust system is a > custom 1 1/2 inch full merged (long extractor) header built for Type > 3's by S&S Headers in AZ that I put on the engine.£m e under 1&2 > cylinders runs under the push rod tubes and not under the head. This is > why it does not clear the thermostat, as much as I wish it did. A Type 1 > header will not fit on a engine with type 3 cooling due to the lack of > clearance in the front on the engine. Many on the Type 1 headers also > interfere with the thermostat. Mine is similiar except that the 2&4 > pipes curve outward to clear the fan housing then into the collector. > The system has all the pipes the same length. You're absolutely right about a type 1 header not clearing the type 3 fan housing; sorry, my brain fade. It sounds like the blame falls squarely on S&S who simply engineered their system poorly. Since the OE heat exchanger was more than 4" diameter, there was more than enough room to fit in both the large J- tubes AND the thermostat, but they chose not to. Probably because they mostly work with users who don't know any better and leave the cooling stuff out anyway. They will probably excuse this by saying that the J-tubes protect the PR tubes this way for off-road use. A better solution would be to position the J-tubes appropriately and add two welded tabs so that the lower sheet tin could be anchored there, too. Since another reason for putting the J-tubes where they did would be to let the cooling air from the cylinders blow on it rather than let it just run hot under the head. I think adding the tabs would allow cooling air to spill over the "sides" and cool the J-tubes, as well as protect the PR tubes and allow installation of the thermostat. Just let me reiterate that it really is counterproductive to leave the thermostat off any street car. Race and rally vehicles are another matter because they don't really see that many hours of use, nor that many warmup cycles. Plus their engines expect to be rebuilt often. If you expect to get reasonable lifetime out of a street engine then you will want to keep all the original cooling stuff installed. One of the other less understood aspects of this ^ ŻJ is that the cooling system uses its maximum power when it is full open, so there is a good performance argument for leaving it intact. Jim - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------------------------- Search old messages on the Web! Visit http://www.vwtype3.org/list/