Bongo Fury

Driver+Passengers wrote:

M 80NGO wrote:Ok some great info on this post and i've read it all with great interest, just 2 things that puzzle me :

1) surely the pipe that's being blanked will fill with crud again bearing in mind that the crud seen in the pics could be 16 years worth of crud ?

If the pipe is blanked, there will be no further crud deposited within it, as there will be no more dirty air going through it.

M 80NGO wrote:2) why is it not just as easy to take it all off clean it all out and then refit complete with EGR as mazda intended ?

If you choose not to blank it, then you may still want to take the manifold and EGR pipe off to inspect, clean and refit - on the assumption that it's not going to be spotless in there, particularly if you're getting the characteristic weeping gunge around the gaskets. Blanking is easier because you don't have to remove and clean, but I'd argue that you'd probably want to remove and clean the inlet manifold and elbow. At which point, it's 6 and two 3s whether you blank or refit. Cleaning out and replacing gaskets is going to be a good job in itself, it's just you may have to do it again a few years down the line.

I get the impression that "as Mazda intended" may be subject to differing opinions. Japan's strict(er) emissions regs require the EGR to reduce nox, and I've read at least one post where the author reckons it 'looks like an afterthought'.

We may be biased towards blanking due to the collective reports that (crud-wise) it "does more harm than good", performance seems better after blanking, it's easy to blank, etc... It is clear, though, that this should not be the final answer.

It doesn't seem like a big deal to include cleaning out and resealing it all into a service regime.

That's what I reckon, anyway. I blanked it because it felt like the right thing to do - who knows?!

scanner wrote:It's not "as Mazda intend" it's as "the people who set the emissions standards intend".

No self respecting engineer worth his/her salt would evenn think about fitting EGR to an engine as the very concept (feeding mucky, filth laden, used exhaust gases back into the inlet manifold) goes against all engineering principals.
As I said earlier the first thing the mechanics at Perkins did when they got a diesel in for a service was disconnect the EGR.

There is a world of difference between what engine makers have to fit and what they would choose to fit.

scanner wrote:It's not "as Mazda intend" it's as "the people who set the emissions standards intend".

No self respecting engineer worth his/her salt would even think about fitting EGR to an engine as the very concept (feeding mucky, filth laden, used exhaust gases back into the inlet manifold) goes against all engineering principals.
As I said earlier the first thing the mechanics at Perkins did when they got a diesel in for a service was disconnect the EGR.

There is a world of difference between what engine makers have to fit and what they would choose to fit.

<EDIT> Superfluous "n" deleted.