Quote Originally Posted by Xilikon View Post
Martin, I'm now splitting my loop in two to add 2 mosfets blocks. To do this, I need to buy a 2nd pump and due to the space constraint (the pump will be installed under the PA120.3 radiator to keep the tubing short), I cannot get a aftermarket top with a top inlet.

So far, the only aftermarket blocks with side inlet would be the Koolance and Alphacool. However, I know that having a 90 degree bend in the inlet will reduce the performance a lot so I'm wondering if it's still a good idea to get a Alphacool or just use the stock top (it's not a problem since I use 3/8" ID tubing anyway) ?
The DD top also has a side inlet. I'm not really sure what the side inlet performance differences are, but I think any of the aftermarket tops will still give you a good gain in average to low restriction loops over the stock top.

Personal preference of mine, but I will not "at all costs" run aluminum in my own loop, so it would be either the DD or the alphacool.

The DD top had a really good shape to the curve, which I still don't quite understand, but it was different than all the rest. The only real obvious difference was that it used a purely circular volute without any relief cut and also used a small/average outlet port size.

Let me see about running a test on the side inlets, that particular question/need is likely to come up for someone else also. I'll be back later with some info on side inlet performance..