2.3T.. 2.4T.. 2.5T.. why?

MDK · Post by **MDK** » 28 May 2021, 04:03

A question for the moderators..I was just wondering why Volvo did that? What could..1 displacement make any difference? Does anyone else find this weird?

Post by **matthew1** » 28 May 2021, 10:19

It's a good question and I don't know the answer. Speculation: a 2.3 -> 2.5 is an 8% increase. HP won't necessarily rise on this linear scale, but with the clear home run that the Volvo 5 cylinder was, I can see them trying to squeeze more torque from her with very little additional effort.

https://www.matthewsvolvosite.com/histo ... -cylinder/

That said, the P2 R cars' sleeves are cracking under heavy boost and today's high miles.

Tuners want the 2.3 HPT block because of thicker cylinder walls. Everything comes with a cost, and in this case the thinner 2.5 walls proved to be that cost.

Post by **jonesg** » 28 May 2021, 20:28

Evinrude made 9.9 HP outboards to avoid the regulations that were set at the 10hp baseline.
Same with 49CC motorbikes , they avoid registration which begins at 50CC.
It might be something similar.

Post by **matthew1** » 28 May 2021, 21:22

In Italy it’s 2.0 cutoff. So Volvo made a 2.0 5-cyl version also

I remember reading of some other markets getting the 2.0, but can’t remember which.

Post by **oragex** » 29 May 2021, 04:58

All good points above. Overall it's perhaps mostly a matter of improving the design and gaining extra torque at lower revs. Volvo started the big turbo T5 with a 2.3 then lowered the bore to 2.4. This helped provide max torque at lower revs. As for the smaller turbo, it started with a 2.4 and went to 2.5 which had a good increase in max torque (235 vs 210) again from lower revs. As for the european 2.0T it's called marketing and perhaps better mpg. I am guessing the 2.0 was a different block as well: They also got the T5 and the R in Europe, and also had the infamous D5 which very unfortunately was not offered in the States or Canada https://en.wikipedia.org/wiki/Volvo_S60