engine swaps..
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From: wolverhampton/ australia
whats involved when it comes to the DVLA.. does any one know how the process works when notifying them of a engine swap??
Cheers Aaron
Cheers Aaron
fill in the part on the log book with the new engine number...send it off to dvla and you will get it back within a couple of weeks with new number on the book
did you get my email?

did you get my email?
From DVLA:
Change to engine and cylinder capacity (engine size)
DVLA will need written evidence of any changes to engine number and cylinder capacity (cc). Written evidence can be:
Change to engine and cylinder capacity (engine size)
DVLA will need written evidence of any changes to engine number and cylinder capacity (cc). Written evidence can be:
- a receipt for the replacement engine
- written evidence from the manufacturer
- an inspection report provided for insurance purposes
- written confirmation on headed paper from a garage if the change in engine size took place before you bought the vehicle
From DVLA:
Change to engine and cylinder capacity (engine size)
DVLA will need written evidence of any changes to engine number and cylinder capacity (cc). Written evidence can be:
Change to engine and cylinder capacity (engine size)
DVLA will need written evidence of any changes to engine number and cylinder capacity (cc). Written evidence can be:
- a receipt for the replacement engine
- written evidence from the manufacturer
- an inspection report provided for insurance purposes
- written confirmation on headed paper from a garage if the change in engine size took place before you bought the vehicle

swapping an engine for another the same size and type only needs the doc filled in with the new number and sent off to dvla
DVLA quote "of any changes to engine number"
Every engine has a different engine number, so changing any engine for any other engine needs to comply with the quote from DVLA.


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From: Buckhaven, Fife, Scotland
when i bought mine, it had a turbo conversion. As far as I know, as much of the original Orion EFi engine was left in, and only the parts needed to add the turbo were added.
How do I go about declaring that? the engine is still a 1.6, so capacity hasn't changed?
I thought i had to have some report of some kind, declaring that the brakes etc have been upgraded as well, to cope with the extra power?
How do I go about declaring that? the engine is still a 1.6, so capacity hasn't changed?
I thought i had to have some report of some kind, declaring that the brakes etc have been upgraded as well, to cope with the extra power?
OK heres your answer as i have been on the phone with DVLA this morning about my focus cossie conversion, they checked and double checked and came up with the following
- if RFL (road tax) is based on emissions or not
The original emissions/ tax bracket is based on the car NOT the engine, so i can put a 2.0ltr in a 1.4focus and still pay road tax as if it was a 1.4, all you need to do is put in writing the engine size and engine number and send it to them with V5 and thats it, obviously it would have to be insured under the new cc but im ok cos im on a trading policy
as easy as that
if your not changing CC sizes then is does not matter as long as your insurance covers you with a turbo conversion
- if RFL (road tax) is based on emissions or not
The original emissions/ tax bracket is based on the car NOT the engine, so i can put a 2.0ltr in a 1.4focus and still pay road tax as if it was a 1.4, all you need to do is put in writing the engine size and engine number and send it to them with V5 and thats it, obviously it would have to be insured under the new cc but im ok cos im on a trading policy
if your not changing CC sizes then is does not matter as long as your insurance covers you with a turbo conversion
Last edited by kilvo; Jan 15, 2009 at 09:36 AM. Reason: spelling issues
also for emissions tests on newer cars, i.e my 1996 escort cossie, no cat, at mot time, its a modified car and has the engine and management system from a 1987 RS500 so the emission goes on the 1987 car
The quote I got from DVLA website appeared about a year ago.
It would appear that persons at DVLA that answer the phone don't know their own rules.
I would guess if you tried to notify an engine change today they WILL ask for the info I quoted.
Regarding the reference to engine size and emissions / tax bracket, that's not the same as emissions as measured at MOT.
People were claiming they had changed their engine to a smaller size to get reduced RFL, when actually they had the original engine in.
DVLA fixed the RFL to original makers emissions data so no matter what engine is in it's still the original RFL rate.
More people were falsely declaring reduced engine size than people genuinely declaring increased engine size, so DVLA's income is hardly affected by the few who fit large engines to cars with low RFL rate.
At M.o.t, emissions are determined by whichever is the oldest, car or engine.
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Last edited by focusv8; Jan 15, 2009 at 04:07 PM.
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