Warning: Bypassing the Heater Matrix - DON'T DO IT!

[Xud Missile]

I looked at that PDF in a sticky in the XUD section the other day and noticed the coolant flow rate was 92l/min @ 2500rpm. My pond pump is 100l/min so it's close. I did another test today.

First I did 3 runs with the matrix, and 3 without

Results were consistent

Then I tried using an XUD exhaust manifold spacer/stud thingy (8mm hole, I didn't measure the open pipes but I'm guessing they're 18mm ish?)

The result of this was a higher flow than with a matrix. So I welded on a chunk of steel and drilled it @ 6mm

I welded a lip around the other end too to stop it popping off. Bunged it in and tried again

6mm flow was too low, I went up in .5mm increments


7.5mm (says 7.5m on the pic, ignore :p ) was cock on so I'll run with that in place and see how it goes.