Engine type CAY 1.6l 66kW/90PS - Euro5 with uncontrolled DPF?

A question for the experts here:

Starting next year, my two Audi 80s with the 1Z engine will no longer be allowed to operate in the new environmental zones being introduced in Austria. Therefore, I will likely be forced to acquire a new vehicle.

According to the latest drafts, unlike in Germany, vehicles meeting the Euro 4 standard may not even be allowed to enter the environmental zones here – so those who own a valuable, relatively new Euro 4 vehicle are in a difficult situation...

Due to an extremely narrow driveway, I am forced to consider vehicles with similar external dimensions and turning radius as an Audi 80 B4. On the other hand, the trunk dimensions of the B4 are just sufficient and must not be smaller. Therefore, Audi is out of the running; the A4 is too wide, and the A3 is too small.

Now I'm considering the Golf VI Variant, which is roughly the same size as the B4. VW Austria offers this Golf Variant with a 90hp and a 105hp engine as a TDI, both being 1.6L CR engines. However, according to the website, VW Germany only offers the 105hp engine. And importantly: This is not the BlueMotion version, which I cannot use because of its lower ground clearance. <<PDF>>

Since I'm currently managing to get by with 90 horsepower and a speed limit of 130 km/h on the Austrian autobahn, 90 horsepower should probably be sufficient for a new vehicle as well.

Here are the questions:

After some back and forth, the car salesperson finally told me the engine code for the 1.6L CR engine: CAY. Is this code the same for both the 90 HP and 105 HP versions? Is that correct? Are the differences only in the software?

According to the seller, the 90hp CAY model is supposed to have a non-catalytic converter DPF – and therefore no emissions issues like excessive exhaust fumes – which would certainly be a selling point. But is that actually the case? You won't get technical answers from VW via email, and I'm not comfortable relying solely on the information provided by the salesperson.

"What kind of performance loss can I expect when switching from the 1.6L 90 HP engine of the CAY to the 1.9L 90 HP engine of my previous 1Z? Or do the modern common-rail engines inherently deliver power more effectively, even in the lower RPM ranges?" Currently, there's only a standard Golf available for test drives, and it's only for driving around the block.

Are there any alternative engine types that also meet Euro 5 standards without a regenerable DPF? Then I could look for alternatives, even among other brands within the VAG group.

Thank you for your responses.

Yes, I'm well aware that buying a new car will be a step backward in terms of durability, reliability, and ease of maintenance, etc. "Made in Mexico" on a Golf Variant doesn't sound very appealing... but you can't really do without a car (currently driving 48,000 km/year).

Hello,

To the best of my knowledge, CAYA, CAYB, and CAYC differ only in their software.
Okay, I'm ready. Please provide the German text you want me to translate.

"All of them have a DPF. Regarding dog walking, the engines with common-rail injection are less problematic than those with PD. Minimum requirements regarding driving style also apply here." If you only ever drive 2km and then park, you won't be happy with diesel engines that have a DPF (Diesel Particulate Filter).

Best regards, Rainer.

Quote:

Engines with common-rail injection are less problematic than those with PD

.

Why actually?

m;

dieselmartin wrote:

Engines with common-rail injection are less problematic than those with PD Quote: . Why actually? m;

Because you have more freedom in designing the injection process compared to port injection, where the camshaft profile is predetermined.

Besides: Have you read SSP?

Best regards, Rainer.

Hello and thank you for the responses.

"To the best of my knowledge, CAYA, CAYB, and CAYC differ only in terms of the software."
"Thank you for the link. Of course, I only looked for the license plate code CAY as indicated by the seller, so CAYB is the correct identifier. According to the list, the CAYB should have a higher maximum torque at lower RPM than the 1Z." That's quite something...

Quote:

They all have a DPF. Regarding driving, the engines with common-rail injection are less problematic than those with PD. Minimum requirements regarding driving patterns also apply here. For example, if you only drive 2km and then park, you will not be happy with the DPF diesel engines.

Thank you. Therefore, the salesperson probably has no idea when he told me that the 90 HP CAYB, unlike the 105 HP CAYC, comes with a DPF in a design similar to aftermarket DPFs, without regeneration, etc.
I guess I'll have to look for a different car dealership.

Of course, a DPF (Diesel Particulate Filter) is not suitable for short trips. Fortunately, I don't have to drive my 48,000 km/year mostly in city traffic. However, even with the 130 km/h speed limit on German highways, the filter is probably still getting quite a lot of strain...

Hi Jo,

What are they selling over there, between the mountains? The CAYA..B..C has the same DPF here, complete with pressure difference, temperature, and all sorts of sensors... I can't imagine that anything else is attached when the diagnostic code is the same; it doesn't make sense to me either.

Quote:

Also: Have you read SSP?

Yes, but I probably forgot again.
I can only remember the other piston groove.
To be honest, I didn't understand why it was different either.

Doesn't the diesel fuel not care who injects it into the combustion chamber?

I'm just imagining...

m,

However, it's not irrelevant to the piston how precisely the flame reaches it... Nozzle angle... Injection duration... Post-injection... Pre-injection...

Perhaps the modified combustion chamber takes into account the adjusted parameters of the injection duration and timing.

Ah, you mean that because you can "always" use CR (presumably referring to a specific technology or method), it's used more often, and that's why the flat pistons are used.
I always wonder about these so-called "developments": Why not do it this way from the beginning?

Initially, I was proud of the valve-less pistons, but now I have these stupid coke nozzles...


I also can't imagine that the DPF is completely passive in the CAY system. After all, everything is now monitored and controlled. Even the path of the VTG is measured "already," which is an innovation .

m;

Oops... that was just a guess...

Besides the material reasons, there are also economic reasons... reasons for increased density... However, I suspect the other possibility, which is related to the injection method, is more likely due to economic considerations.

Hello,
Perhaps a bit off-topic, but interesting to discuss:

Quote:

Ah, you mean that because you can "always" do something with CR, it's done more often, and that's why the flat pistons.

Does that mean the recesses in the CR injectors are shallower? That would be strange, since the CR injector, with its pilot injection and main injection, has a larger crankshaft angle window in which injections occur. It's clear that the late injection for DPF regeneration isn't going to solve the problem.

Or has there been a resignation to the fact that it would be impossible to fit all the pre-injection nozzles (I mean the current 2) and the main injection nozzle in the combustion chamber? Has anyone ever had an oscilloscope connected to it and knows the angle (degrees) involved? When is the first injection of OT administered?

@Team100:

Quote:

After some back and forth, the car salesman told me the engine code for the 1.6L CR engine: CAY. Is this code the same for both the 90 HP and 105 HP versions? Is that correct? Are the differences only in the software?

Yes, the 1.6-liter engine is still available in the Polo with a power output of 55 kW. All three motors are 100% identical in design; the power is simply scaled through the MSG.