Db9 exhaust manifold removal
Discussion
Yes ive seen a picture of a manifold thats been cut to remove, 8tech did a 6 branch conversion to his manifolds im hoping he sees this post and weighs in.
Theres quite a lot of info on o2 sensor spacers solving the error message issue seems its a well known thing in the tuner world
Although i am having second thoughts about the whole thing now i'm on the radar at "Team America"
Theres quite a lot of info on o2 sensor spacers solving the error message issue seems its a well known thing in the tuner world
Although i am having second thoughts about the whole thing now i'm on the radar at "Team America"
Ive had a proper look at it now and im afraid its just a job too far,
Even if i did the mechanical work theres still the ecu remap to avoid the mil light and to re set the fueling from the constantly cat protecting over rich.
So ive seen sense ( thanks paulrog) and contacted br
Received email next day with a very reasonable price
For job including a switch for active exhaust valves,
As much as i like doing my own work youve got to kbow when its time to call the pros.
As soon as work allows i'll be off br and will report back here.
Even if i did the mechanical work theres still the ecu remap to avoid the mil light and to re set the fueling from the constantly cat protecting over rich.
So ive seen sense ( thanks paulrog) and contacted br
Received email next day with a very reasonable price
For job including a switch for active exhaust valves,
As much as i like doing my own work youve got to kbow when its time to call the pros.
As soon as work allows i'll be off br and will report back here.
Well fast forward from April 21! , I never got round to getting my primaries removed, time/ work etc etc. but now I’m retired and times not a problem ( which feels odd).
It’s up on my lift now for full service and a few other bits so belly pan and arch liners are off, so this jobs on my mind again.
Has anyone on here done this job ?, the only bit that I just don’t get is how cutting the rear down pipe just below the cat can making it possible to remove 2 bulky sections of manifold.
Any advice greatly appreciated
It’s up on my lift now for full service and a few other bits so belly pan and arch liners are off, so this jobs on my mind again.
Has anyone on here done this job ?, the only bit that I just don’t get is how cutting the rear down pipe just below the cat can making it possible to remove 2 bulky sections of manifold.
Any advice greatly appreciated
db9 was produced with 6 converters 4 small ones in the manifolds and 2 large ones halfway down the exhaust system.
Gas conversion takes place in the 4 manifold converters the 2 large ones do next to nothing,
In order to achieve exhaust gas recirculating without pipe work and associated valves etc AM decided to use a large valve overlap to produce “internal egr”.
This is fine until a misfire develops on one or more cylinders which can be completely undetected whilst driving.
The unburnt fuel from the misfire exits the exhaust port straight onto the face of the converter where it auto combusts.
Small fragments of rock hard ceramic material breaks off and as a result of the egr system
enters the cylinders where it begins to grind the cylinder walls and pistons making its way past the rings into the sump oil where it finishes destroying a £25,000 engine.
So removal of the primaries prevents this and gas conversion is carried out successfully by the up until then almost unused large secondaries emissions are unaffected.
A gentlemen who was involved in the development of our AM engines has confirmed that this is the case.
I still might sack this job off , not because of the global outrage but because it’s a difficult task and fitting a set of Ngk coils and plugs every few years is a lot easier!
So happy Christmas to you all in the UK and especially to my overseas friends trying to keep me on the straight and narrow
Gas conversion takes place in the 4 manifold converters the 2 large ones do next to nothing,
In order to achieve exhaust gas recirculating without pipe work and associated valves etc AM decided to use a large valve overlap to produce “internal egr”.
This is fine until a misfire develops on one or more cylinders which can be completely undetected whilst driving.
The unburnt fuel from the misfire exits the exhaust port straight onto the face of the converter where it auto combusts.
Small fragments of rock hard ceramic material breaks off and as a result of the egr system
enters the cylinders where it begins to grind the cylinder walls and pistons making its way past the rings into the sump oil where it finishes destroying a £25,000 engine.
So removal of the primaries prevents this and gas conversion is carried out successfully by the up until then almost unused large secondaries emissions are unaffected.
A gentlemen who was involved in the development of our AM engines has confirmed that this is the case.
I still might sack this job off , not because of the global outrage but because it’s a difficult task and fitting a set of Ngk coils and plugs every few years is a lot easier!
So happy Christmas to you all in the UK and especially to my overseas friends trying to keep me on the straight and narrow
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