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Re: *sigh*, (from fender-man)
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Posted by Janicholson on October 05, 2005 at 08:49:40 from (199.17.6.175):
In Reply to: Re: *sigh*, (from fender-man) posted by P and R Pete on October 05, 2005 at 06:48:38:
Thermo siphon is simple. Heated liquid is lighter than cool liquid. The level in the system is higher than the hoses and passages, so the warmed up block water (antifreeze) raises and displaces cool radiator water, which flows into the block and cools it. The cooling is a little less even, and less able to remove heat under conditions of stress (high loads and hot ambient temps). The thermo siphon system may not have a thermostat in it. A 170-180 degree t-stat is a good idea with a pump because the engine temp will never move the gauge without it, and cold engines carbon up more than hot ones, while being less efficient. The radiator on a non-pressureized system will not be able to stand pressure. The neck could be changed to a pressure cap style, but the tank and tubes may be ill prepared for 6-7 psi (the normal pressurization for early letter series) If a radiator "MAN" guarantees it, and is willing to cover your labor to R&R the radiator, then I'd use the old rad. Pressurization allows higher operating temps in the engine this adds efficiency and lowers fuel consumption some. It also allows more heat to be removed (the higher the temperature in the radiator the easier the air can remove temp) There is no need to do the pressure thing, just info. Good luck JimN
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