Thread: Puma Engine Emission Control Description

have a read of this thread....might give you some helpful info

Defender2 - View topic - Puma EGR blanking plate FREE :-)

What do you mean "runs a lot sootier" - a higher concentration of soot in the oil or in the exhaust???

Both the puma/transit 2.4 and the TD5 are high pressure commonrail EFI diesels.

Both are Euro IV emissions compliant (maybe not early TD5s in OZ???).

Emissions control is via high pressure, computer controlled injection, in conjunction with EGR.

The Oil centrifuge fitted to the TD5 reduces soot buildup in the engine, but will have little-no effect on soot emissions from the exhaust (except in reduceing weaqr and thereby long term emissions).

The Puma/transit 2.4 may have a bypass filter?

Originally Posted by isuzurover

The Puma/transit 2.4 may have a bypass filter?

There is no bypass filter on the Puma engine.

You will find the workshop manual description of the Puma engine EGR here:

http://www.defender2.net/gallery/alb...0Operation.pdf

if they've retained the same setup as the older transit van, its similar in concept of operations to the TD5 but located differently. (which means that more or less its the same as every other turbo diesel EGR system.

as with all EGR setups in theory blanking the EGR on a system that is working correctly provides no difference to performance or power but it does prevent the soot thats in the exhaust from getting into the intake which can only be good for engine life span. blanking off an EGR that is malfunctioning should restore your engine to its pre malfunctioning performance.

were you after the theory of the EGR system or the specifics of how its achieved and controlled on the new donk?

Originally Posted by one_iota

There is no bypass filter on the Puma engine.

Are you 100% sure??? Many engines (e.g. toyota diesels) have a full-flow and bypass filter incorporated in the one unit. The transit 2.4s have a HUGE filter element, so I suspect that is the case. However have yet to check with my contacts in the OEM industry.

Ben,

I might stand corrected. I was thinking of the Td5 type centrifugal filter which the puma does not have.

Originally Posted by isuzurover

Both the puma/transit 2.4 and the TD5 are high pressure commonrail EFI diesels.

Both are Euro IV emissions compliant (maybe not early TD5s in OZ???).

The TD5 is not really "high pressure common rail". It is a unit injector type; i.e intermediate pressure fuel rail with high pressure camshaft driven unit injectors controlled electronically by the ECU.

It is also not Euro IV compliant, and that is why LR are now using the Puma engine which IS Euro IV. The later TD5's (with modified head, higher injector pressure, and particulate filter) are Euro III compliant. Australian engines, to my knowledge, did not have the particulate filter, so are not strictly Euro III.

Cheers,

Lionel