1.4 16v displacement size increase

Hello from italy, forgive my english.

I have a 2010 polo 6r 1.4 (cbbg) which is now over 300,000km. It has never been quick (neither as new car), but now, after so many kilometers, it has become really painful, especially when driving uphill. It has no technical problem, even the oil consumption is low; but I can't stand this polo anymore.

Now, in my opinion, this polo would have been perfect if it had fitted the ubiquitous 2.0L 8 valve 116ps engine that the 2001 fabia 1 received. The polo is very heavy, it's not a 700kg car anymore, but the engine remained only 1.4...
By comparing videos on youtube, I saw that the gearing of my polo model and one of the fabia 1 2.0 are identical, this means that it is the polo that has an engine that is too much small.

So I would like to increase the displacement up to at least 1.8 (which, considering the 16 valves, should be equivalent to a 2.0 8v). Playing with the catalog, so far I have only found a 1.6 16v that runs on LPG (polo 1.6 LPG), but the gain would be too much small, I need a longer stroke (and of course bigger pistons' bore); and in the catalog it is not clear whether the increased stroke of the 1.6 is compensated by shorter connecting rods or by a longer height block.
Also, I ABSOLUTELY need to not to increase the RPMs, I need only torque.

An important thing is that this modification must be totally "stealth": the block must remain the original one; in order to compensate a longer stroke I would use some customized connecting rods (eventually I will look for an engineer to reduce their length and I know that there are some companies which make customised rods).
The cylinder head could be not the original one but it must LOOK the same of the original when seen from the outside, but the sensors of the head must remain the same because even the electronics must be the original one.
The only way to uncover this mod must be the disassembly of the engine with analysis, or the rolling test bench.

Did anyone here ever do something like this? I would like to know which parts I should get, also in order to make myself a budget ...

Now a pre-empitive answer for a question I'm sure every person with a little of common sense would ask me: "Why don't you just get a new or a different car?"
Well, I can't do so for "reasons". If somebody wants to know, I can annoy you with all the issues an italian has when he gets or has a car.

So... any idea?

CIAO

Hi there,
You have quite high demands if the engine is to remain the same externally.
Of course, you can achieve more displacement with special pistons, crankshafts and connecting rods, but the effort is in no relation to the profit.
In addition, I don't know whether it is possible to legally drive another diesel engine from the VW Group in Italy.
A 2.0L diesel from an accident vehicle would be ideal

That is the task of the thread creator, to make a conversion that is not visible from the outside.

Precisely because this is about diesel engines, you won't get much input here. Diesel tuning is not so widespread here in the forum.

The first thing you do with a diesel is to increase the injection quantities or times. That brings torque.

If you want more, you will have to acquire the knowledge of what works and what doesn't work yourself.

But before you lose heart, try to extend your audience here in the forum by posting your request in German.

deepl.com is a powerful translator that produces fluent, meaningful text.

Translated with www.DeepL.com/Translator (free version)

Hi I am also not an expert in 'modern' diesel engines but I guess it will be quite a challenge to modify bore & stoke that much while using the same block.

I'd prefer to use rods & pistons close to original dimensions but use high durable sleeves (like darton sleeves) in the block.
To raise the torqe in a proper way I'd more try to modify the injection as well as the turbocharger. With a high durable block I can imagine it will be possible to 'give' the engine comparable power.

Related to your initial issue I can imagine that the loss of power is mainly driven by worn injectors.

Sebastian

hello

cbbg = not Polo

CBBA + CBBB = 2,0 diesel

diesel engine > wikipedia polo 6r 1,2 liter CFWA / 1,6 liter CAYA / CAYB / CAYC

leute , er wird nen benziner haben > keinen diesel

er wird einen C G G B haben = 1400er 86 ps

Mfg Kai

I'd "simply" go for another (more powerful) engine of another 6R (and you might investigate if you then also need other parts in a more powerful version e.g. the brakes).

But at least from germany i know that it's not allowed to throw in an engine that has a worse exhaust gas rating than the one you initially had in your car ( your car, not any 6R). This also counts for "tuning your engine". Worse exhaust emission standard (than original) = "votekick" from the tech. inspectors -> you should really check this in advance for IT.
On every-day-use ofc. nobody will see this, neither your family nor the polizia ... until there is a (yearly?) exhaust gas inspection (is this also mandatory in IT?)

The on my left shoulder tells me that it might be the cheapest way to buy a Polo that optically just looks like yours (including all the scratches and dimples ) but only with a bigger engine.

If you are highly pain-tolerant, want to do alot of ungrateful work and money isn't an issue for you, you might get a bit more hp out of your current block ... but don't expect wonders.
This isn't "making a new engine out of an old one" but rather "optimizing and customizing your HW/SW setup to get another 5-15% output power". But when you e.g. increase your compression you might not be able to use "normal Super 95" fuel (but need some special gasoline with a higher knock resistance).
This might also count for other not-that-stealthy-measures like adding a turbo/compressor.

Zitat:

leute , er wird nen benziner haben > keinen diesel

Zitat:

hello
leute , er wird nen benziner haben > keinen diesel
er wird einen C G G B haben = 1400er 86 ps
Mfg Kai

Now why I was about this messy thing: the context. Read only if you can understand an aproximative english and have spare time

I don't want to get rid of my polo because, excluded the engine, it's still perfect but I won't get 100 euro out of it. The body was never crashed and it's rust free. Also I don't wanna buy a brand new car, it's too much expensive and the offer has become a joke. For example, the more the cars grow, the smaller the engines become, and everything is overpriced. If I buy an used polo, like a 1.2tsi sold at 12.000, I can get a car that is identical to the mine but can be crashed and maybe with a worn out engine; while I'm throwing away my perfect vw bodyshell.
So I thought that budgeting <5.000 euro to fix my own polo, in the way I wrote, could make sense; in that way my daily car could have been good also for longer trips or to go to the mountain.

I want to add: a normal person living into a normal country would have just bought another used car which is more suitable for trips.

I looked for a volvo TDI estate (to pass it as historic, lately), because they have the same engine of the venerable T4, that I know very well (we had 2 of them, both progressively banned).
But I had to pay like 2000 euro for the car, 1000/1500 euro for a trip in Germany (including insured numberplates) because here such cars are inexistent since ppl were forced to junk them (so they went to eastern europe) and also i want a tow bar and in germany all the cars I found have it, while here not and if you want to add it, you have to pay at least 1500 euro! While the transport admin. is late of a year to register this mod (no jokes, an agency told me they were homologating the ones installed 10 months before!)
And than add:
- 600 of tax "just because I bought it": I deserve to be punished for such an action(yeah,...),
- 400 yearly as property tax (calculated over the kw and euro norm),
- 800 euro for insurance (and I have best records!).

Just the first year, I would have been near to the 5000 euro for a customised 1.4 for my polo, that could solve a lot (not tow a caravan... but I could settle with that).
And I'm not considering the rust due to the german salty winters that surely have ruined the volvo bodyshell.
A volvo that, however, is banned here (excluding saturdays and sundays).

So, well,...
No. I pay the full tax and insurance, but can drive it mostly when you stay at home.
No-thank-you.

That's why I came here asking you for help about a possible solution for my polo.

Grandpa
Zitat:

In addition, I don't know whether it is possible to legally drive another diesel engine from the VW Group in Italy.

That is the task of the thread creator, to make a conversion that is not visible from the outside.

Also do not see a real chance to give the engine some more torque. Even the 1.6 as you'd already saied is not a proper base for a invisible tuning.

In case of Volvo:
I'd not prefer the old 5 cylinder diesel engines, that are also used at VW. Later built 5 cylinder are much better and more powerful. You could also check for a turbocharged petrol engine & do an LPG conversion.

The 1.9 Diesel used in the old V40 is also very cheap & rigid.
Engines from Ford are not that great, excepti the 3.2 & T6AWD used in V70, S80 & XCs.

Another alternative, even if an unpopular one would be the Opel Insignia as 2.0 Diesel, the one with 163HP as FWD.


Sebastian

Zitat:

If I know a german guy who could fakely buy my polo from me, register it with german plates and register the engine installation, to fakely sell it back to me I would be all happy.

Zitat:

I'd not prefer the old 5 cylinder diesel engines, that are also used at VW. Later built 5 cylinder are much better and more powerful.

Zitat:

That would be the best. Don't you happen to have German relatives? Or a German Shepherd?

For 5000 Bucks it must be possible to run a deal with a german tuner such like röttele.

Zitat:

However such newer cars you listed (common rail 5 cyl from volvo) can't be converted into oldtimers, so I would pay in taxes and insurance more than what I could pay for the car itself.