The double pass radiator increases the efficiency of the radiator by about 50%.

You have tanks on both sides. One side has a partition in the tank with the inlet at the top and outlet at the bottom.

The coolant flows across the top half of the core into the non-partitioned tank then back across the lower half back to the partitioned tank and out the outlet.

 

That's the way I went with a custom Ron Davis radiator.

On Fri, Jun 15, 2012 at 9:49 PM, <CozyGirrrl@aol.com> wrote:

I can certainly see the logic in a single pass radiator of in on top and out on bottom.

 

With a dual pass design (tanks top and bottom) what would be the advantage of inlets and outlets on the bottom -vs- the top in a case with the water pump above the top of the radiator?

 

In both cases their would be a vent line to the swirl pot from the top tanks.

 

...C&R