Compression reduction for 1.9 TDI-PD engines

hello!

'I'm running my engine with over 200 horsepower. I once calculated that a three-hole head gasket would reduce the compression ratio from 19:1 to 18.5:1. Here in the shop, we also have special pistons designed for VP-TDI engines to reduce compression, which helps to manage peak pressures at power levels above 200 horsepower and reduces the stress on the head gasket.'
My question is: what compression ratio results from these pistons, and could I use the same compression ratio in my PD-TDI engine at this power level?

greetings

Hi,

Using pistons from the shop changes the compression ratio from 19.5:1 to 18.5:1. However, that won't help you, because a) they aren't suitable for PD (presumably referring to a specific product or device), and b) the compression wouldn't be significantly reduced.

[Edit: Combustion chamber design changed, new compression ratio for the VP-TDI pistons: 18.0:1]
[Edit2: now also for common rail engines: http://shop.dieselschrauber.de/product_info.php/cPath/44/products_id/256]

Best regards, Rainer.

Okay, well, it's like this. What compression ratio should I use so that the peak pressures stay within the acceptable range?

hi rainer!

I saw that tuning pistons are now available for PD engines. I assume that if they fit an ASZ engine, they should also be suitable for a BLT engine? Are they available for delivery within a short time, or how long would it take?

and then, another thing. On this occasion, you could also replace the connecting rod bearing shells with stronger ones. Were there not other bearing shells available for purchase in the shop? I couldn't find any. Where can I get tuning bearing shells for the connecting rod?

greetings

Hi Stefan,

Yes, they should also work for a BLT sandwich (should, because I haven't tried it yet).

Regarding the peak pressures: they are, of course, significantly lower than with the original pistons. I can't provide any absolute values, as I don't have access to your software.

The lead time for PD/VP pistons is currently 3 months (due to ongoing modifications).

Best regards, Rainer.

ooh, three months is a long time . Are these the correct forged pistons? Which manufacturer?

Can you tell me something about the bearing shells?

Hi Stefan,

The piston blank comes from Mahle, so it's not scrap. I am a manufacturer.
The 3 months are due to the fact that it doesn't make sense to quickly set up a manufacturing facility and then quickly dismantle it again, especially considering the circumstances.

Original connecting rod bearing shells usually don't cause any problems; however, if the engine has been running for a long time, it's a good idea to check the crankshaft journals and replace the bearing shells in the connecting rods.

Best regards, Rainer.

'No, it's only got 31,000 km on it. So, it's not always the case that new bearings are installed just because the old ones were removed. I just wanted to know because otherwise, we could have looked to see if there are any stronger options available for motorsports or similar applications.'
Do you only accept orders with advance payment?

Hi Stefan,

Quote:

Do you only accept orders with advance payment?

Yes, for labor-intensive items like pistons. General life experience suggests that this is a good thing.

Best regards, Rainer.

I believe you, and that's understandable. However, I can't help but think that for some people, it's a significant financial burden to pay 899 euros three months in advance without receiving anything in return.
but I think it's great that you offer such pistons. If you give me the okay that they definitely fit my BLT, then it's possible that I will buy some.

Hi Stefan,

Just wait a little longer. When everything is ready, there will be a corresponding post .

Best regards, Rainer.

Okay. Could you possibly send me a private message with your email address? I'm going to the seaside and will be gone soon, and then we could stay in touch via email. I can only send emails there, but I won't be able to use the internet with a browser.