I called Fluidyne and spoke to a guy that was very informative. He said that the smaller tubes of the 5 row allow for higher pressure, the radiator is rated at 40PSI. He said that due to the smaller tubes the insulating factor of the water against the surface of the tubes is reduced. There are also now more weld points attaching the fins to more tubes which again improves heat transfer. He would not give me a percentage of improvement over the 3 row version but said that it is an improvement.
Summit lists the FHP35-PAN for $597.00.. Make me an offer on my FHP30-PAN
Steve
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