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On 28 May 99, at 21:29, Jason Mooth wrote: > I thought that if the thermostat was gone that the flaps would be wide > open and max air would flow across engine? How could that cause > overheating? I run a big header on my Type 3 which does not allow room > for a thermostat because of the J-pipes. I know it is good for engine > life to have a thermostat so that the engine warms up properly but here > in Hawaii its 75-85 F , 365 days so I'm not too concerned about chilly > days. Also, isn't a lean condition more dangerous and more likely to > cause overheating and damage. A rich condition just wastes gas and will > foul spark plugs. If the thermostat is gone, but everything else is in proper place then you are right, the flaps will be open, but it is a little hard to claim that the same person who left the thermostat out went ahead and did everything else right. There is NO J-pipe that is bigger than the stock heat exchanger and the header doesn't fit anywhere near where the thermostat belongs. I suspect that what someone has done is put type 1 J-pipes and headers on your engine and now you think that they are "special." The type 1 parts fit more "inboard" than the type 3 parts, but I would still be surprised if they interfered with the thermostat because I thought all these engines used the same thermostat holder and thermostat. 75-85 may seem tropical to us, but our engines need to be at about 165 F to be happy.Ècì“ Hawaii seems chilly to them on startup. You're right about rich and lean. I will add, however, that rich can wash down the cylinder walls and wear out the rings. Jim - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------------------------- List info at http://www.vwtype3.org/list or mailto:help@vwtype3.org