Originally Posted by mharvey
This is for the Evnetics guys...In the Sol Jr manual it specifies 20 psi or less for the cooler pump. Is 20 psi a hard limit? I have a small d5 pump with a 50 psi rating. Too much even though Im pumping through a tranny cooler etc? Any practical experience with a high PSI rating? What are the risks? TIA
A "d5" pump? That sounds like the Laing D5
, which is exactly the pump we recommend. The 50 psi maximum system pressure reached by that pump is a theoretical number that it can withstand, not what it delivers in normal operation. Even if you were to completely restrict the output of the pump it won't hit 50 psi at 12V (max pressure would be ~5.8 psi). In a typical installation the maximum system pressure will be 3-4 psi while delivering the ideal flow rate of 4 gpm.
The 20 psi limit is, indeed, a maximum, because aluminum castings are slightly porous, so too high a pressure in the cooling loop will result in "weeping". That, as you might imagine, would be a very bad thing.