reitmeid

I got my cm90 today with the 3/4" ports. I can't beleive how big it is. Currently running cm30. Even the improved Bosch which is considerably larger than the cm30 pales in comparison. Will be the heart of H/E system improvements I'm putting together this winter.

SterlingE55

Increased cooling efficiency in the winter. I like it. haha. The CM90 is a beast. I'm sure it will compliment your HE system well.

Exotic-metal55

I don`t know about Minnesota but we need all we can get down here. !!!! Sure was cool logging IAT`s in the 45 deg range this week..lol !

reitmeid

I also picked up some solid state relays, a little 12v temp controller, a fuseblock, and a 0-20 g/m flowmeter. I'm prototyping my system on the bench, so I can check overall flowrate, and ultimately which collection of system components can draw the heat out of the coolant most quickly. Yes, I'm a little bored during the winter. At this point I think I'll be using 2 h/e 's a trunk reservoir, the cm90, and a fan controlled by the digital temp contoller.

Exotic-metal55

Can`t wait to hear the findings..

I run two H/E`s, Mezarie pump and pump wired full time..Real happy with IAT`s.. Even in brutal Houston heat.. I run 8-15 deg. over ambient in most extreme cases and recovery is measured in seconds.. In other words, it can be 95 deg. I boost up hard on a Z06 vette , then let off and ready to rock by the time he down shifts and stabs it. Peeeeeerfect.. Always room for improvment though.. So bring the findings!

stevebez

Hmm did not know they made a 3/4 spout for the 90... I still got the 38mm unit. It must have a different impeller as that small opening may cause cavitating on the 1.5" spout unit I would think.

BTW watching some discovery channel (what else is there besides discovery and sport?), and they had a program on subs and propeller cavitation. The cause of cavitation is not air. Cavitation creates bubbles from the water "boiling" - yes boiling - at the tips. Now its not becuase the water reaches 100degC here but simple physics says water will boil at lower temps at lower pressure. And that's just it, the propeller creates very low pressure areas at the tips of the blades; the pressure drops so low that the water boils at ambient temp and bubbles appear, too many bubbles and we have -> cavitation. Now not sure the cavitation in this context is the same as a water pump, but don't see why not, either way I thought you guys might find it interesting....

reitmeid

The cm90/38mm pumps 115 l/min (30.4gpm). The cm90/20mm pumps 65 l/min (17.2gpm). The backpressure figures in both cases are identical. I guess there's a different impeller for each but I don't know. If there are different impellers, then increased backpressure might be found in an installation where 38mm pump was necked down to a 20mm system. Lots of info here:

http://www.johnson-pump.com/JPMarine...B-305_CM90.pdf

TopGun32

good info here.. I was planning to go with Mezerie pump next.. but the CM90 with 3/4" outlet and inlet would be perfect!