Why is the rum gone?
Join Date: May 2012
Location: United Kingdom
County: Greater Manchester
Fixitsan did a fair bit of research into this,
Basically the honeycomb is like a big box of straws, They are all blocked at one end, but it's every alternate one blocked at the front, and the other ones are blocked at the rear. the material that they are made out of is porous and lets the gasses though but the particulates get caught in the walls of the straws.
if you take the back end off the straws then you can open enough of them to be straight through so no restriction and no clogging.
(they are not straws, that's just to give you the idea of the construction of the DPF)
I don't know about drill length, but if you separate the exhaust just after the DPF IIRC you can get a normal household drill far enough in to break the back of the honeycomb.
(search for fixitsans DPF thread, he it has pictures and much more info about what and how it do it)