Older engine into newer car?

[Sithdowell]

I have a brilliant AHF 1.9tdi 110bhp engine and gearbox from a 1998 mk4 golf.
I want to swap it into a 2.0d 2006 Caddy with a burst engine.
It looks like the older engine puts out less CO², is just as efficient and is more powerful. Would there be a problem with road tax/MOT emissions tests?
Would it work?
Any and all constructive advice is welcome!
Thanks
Sith

[paintman]

Would expect it to be required to comply with the permitted levels for the age of the vehicle not the age of the engine.
Bit of reading for you:
www.mot-testing.service.gov.uk/documents/manuals/c...
Scroll down to 8.2.2

[gareth_r]

paintman said:

Would expect it to be required to comply with the permitted levels for the age of the vehicle not the age of the engine.
Bit of reading for you:
www.mot-testing.service.gov.uk/documents/manuals/c...
Scroll down to 8.2.2.

The rule changed when the MOT test was revised earlier this year.

The emissions test used to be based on whichever is older, chassis or engine, but the MOT manual now says: "If a vehicle first used on or after 1 September 2002 is fitted with a different engine, you must test it to the emissions standards for the age of the vehicle.".

[Sithdowell]

Thanks for the replies, that's what I was thinking.
According to the research I've done on the van and the engine, the 2.0sdi engine in the van puts out 159g/km, and the older engine puts out 140g/km. So *in theory* and *on paper* it looks like a winner...

[paintman]

They did indeed & that's the one I've linked to (shown as updated Sept 2018):
"This version of the inspection manual must be used when the MOT rules change on the 20 May 2018."
www.mot-testing.service.gov.uk/documents/manuals/c...

Your comment "If a vehicle first used on or after 1 September 2002 is fitted with a different engine, you must test it to the emissions standards for the age of the vehicle." appears in section 8.2.1.1 which deals with spark ignition vehicles & no mention is made of that in the compression ignition section which just gives requirement according to the vehicle's date of first use.

Edited by paintman on Tuesday 20th November 12:37

[GreenV8S]

Sithdowell said:

the older engine puts out 140g/km. So *in theory* and *on paper* it looks like a winner...

Stating the obvious, but the older the engine is the less likely that it will actually meet its specification.

[300bhp/ton]

Sithdowell said:

Thanks for the replies, that's what I was thinking.
According to the research I've done on the van and the engine, the 2.0sdi engine in the van puts out 159g/km, and the older engine puts out 140g/km. So *in theory* and *on paper* it looks like a winner...

I think Co2 is rated by vehicle, not engine. i.e. the same engine in different vehicles will produce different results. This would be for type approval, not MoT testing.

[GreenV8S]

A responsive revvy engine probably works well when you are buzzing through the gears in a lightweight Golf but you will probably find yourself thrashing it trying to drag that much heavier van around. A slow but torquey engine is probably more suitable for the van.

As well as probably not being much fun to drive, you may well find that your tired old engine is not as durable as you thought when asked to slug its guts out all day.

[Sithdowell]

Wouldn't be using the van for heavy weight, it'd be for getting gear to and from gigs. Maybe put a 2nd row of seat in it, but it would never transport heavy cargo.