Just to investigate, I did find that the ECHO does have a smaller radiator (it has the 1.5L engine). As you would expect, the mounts are different and the hoses are in different locations (same diameter heater hose ports though). They both have 5/8" diameter radiator tubing, so the difference in pressure drop will only be due to the shorter tube length. Difference in core size?
Corolla: ~340 sqin
ECHO: ~260 sqin
Or about 25% less area. The height is the same, making the mounting a bit simpler. At a guess, coolant volume would drop by ~10-20%.
EDIT: I'm diggin' what BMW is doing on their water pump tech.
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Last edited by chuckm; 10-12-2009 at 02:51 PM..
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