205 1.9 Engines

[Mattr5uk 20 5 Cars]

Apart from management systems are the engines the same through the years?

[welshpug 1,627]

no, the engines varied with the management, there's 128 122 and 105 bhp engines.

[Mattr5uk 20 5 Cars]

Do you know what they changed to allow for difference in bhp?

[Simes 248 2 Cars]

http://www.205gtidrivers.com/articles.html/_/articles-guides/205-gti-basics/technical-specifications-r12

[Mattr5uk 20 5 Cars]

Thanks Simon.

I Should have searched for info being a little lazy :/

[Mattr5uk 20 5 Cars]

looking at the technical spec of the 1.9 engines the vast difference is in the compression ratio, the bore & stroke are the same so am I correct in theory you could take a block & head from any 1.9 and fit to another without issue? I remember changing the engine on my 1.6 to a 1.9 a fair few years ago now, it wouldn't run on the 1.9 injectors but did on the 1.6 ones pretty well.

[JackTar 0]

I have a similar dilemma. I have a near mint 1.9 engine that has done only 55000 miles - the problem is its a cat version which I believe only has 105 bhp. Could this engine be mated to a 1.6 gearbox and be driven with a standard 1.9 ecu or will I have to get the ecu remapped?

[Mattr5uk 20 5 Cars]

It will bolt perfectly fine to gearbox and my 1.6 car ran fine with a1.9 engine in it the only thing I had to swap was injectors.

[welshpug 1,627]

there is quite a difference between the 105 and 122+128 engines, namely valve lengths and combustion chamber sizes, and a matching piston dish, also cam duration and management.

[Mattr5uk 20 5 Cars]

However if you take a 1.6 105bhp car and fitted a 1.9 128bhp just head, block an manifolds no management as I did a few years ago it ran well. It didn't want to start initially but once I fitted the 1.6 injectors it started fine( not sure if injectors were knackered or it's because they were a mismatch with 1.6ecu)

What car are you planning for it to go in?

[welshpug 1,627]

there's a 105 bhp 1.9 too.

[martyn180 9]

Ive just had the high lift cam\ported headed ( skip brown rs3 ) taken of my cat engine, as it just didint run well and didnt get anymore power in the end, the motronic ecu stuggled to cope, no one seems to one to remap these any more, as you need to take the chip off, and solder it back on. Wayne at Chipwizards use to do it, but not anymore. or go aftermarket emerald/omex.

 

If the cars concourse , leave it be, they run nice , just feels flat but the torque will take you through ok. if you are really after more and have low compression engine , then turbo it your not bothered about originalty.

[Mattr5uk 20 5 Cars]

I didn't know that, it's always good to have much more technical knowledge of these engines. Especially if your trying to avoid further issues with the way it runs.