Originally Posted by
Martinm210 
Since I was switching out my T line fitting and barb fittings out from 1/2" to 5/8" I decided I'd take a look inside my MCP655 pump to make sure it was all good and clean.
It was...but...
I checked out the impeller design and upon inspection I noticed the outlet was poorly casted. A sharp open bay to pipe is a significant exit loss, and not only that, there is also a portion that slightly extends into the pump.
**Off I go to the garage for my trusty dremel and drill motor***
A while later slightly boring out the outlet, and using my various dremel bits, I had a much smoother flowing outlet that looked like this:
And while I was at it, those barbs are awefully sharp too:
Better fix those...
Ahhh much better.
I did some flow tests using my trusty 5 gallon bucket and came up with the following:
Pump and 10' of 1/2ID tubing only
Before 3 gallons in 1 minute and 25 seconds = 2.12 gal/min
After 3 gallons in 1 minute and 6 seconds = 2.73 gal/min
A 28% improvement on pump + 10' tubing only.Then for the real test, how my loop performs include D-Tek Fusion + MCW60 + MCR320 + MCR320 + T-line + about 8' of 7/16ID Tygon + 10' drainage tube for the test
Before 3 gallons in 2 minutes and 1 second = 1.49 gal/min
After 3 gallons in 1 minute and 50 seconds = 1.64 gal/min
A 10% improvement in a CPU + GPU + 2 rad loop, not bad!
Some of that might have been from upsizing the barb and t-fitting to 5/8", but I suspect most of it was the pump mod.
I knew all my wrenching and modding days with the dirtbike had some use in the computer somewhere
