atomsplitter
Living Legend
- Joined
- Nov 29, 2007
- Messages
- 3,948
- Location
- Keller, TX
- Ride
- 23 Rocket GT, 20 Bobber Blk, 22 Speed Triple RS
The 2.3's ran 8:1 compression while the 2.5's run 10.8:1.
What I found using Co=Pilot:
If you’re asking for factory cylinder compression test pressures (e.g., PSI or kPa values for a compression gauge test), Triumph does not publish those numbers in any publicly available service documentation for the 2025 Rocket 3. Only the static compression ratio is provided.
However, based on the 10.8:1 ratio and typical behavior of large-displacement, low‑RPM, high‑torque triples, expected compression test readings (inference, not factory data) would generally fall in the 170–220 PSI range on a healthy engine — but this is not an official Triumph specification.
What I found using Co=Pilot:
If you’re asking for factory cylinder compression test pressures (e.g., PSI or kPa values for a compression gauge test), Triumph does not publish those numbers in any publicly available service documentation for the 2025 Rocket 3. Only the static compression ratio is provided.
However, based on the 10.8:1 ratio and typical behavior of large-displacement, low‑RPM, high‑torque triples, expected compression test readings (inference, not factory data) would generally fall in the 170–220 PSI range on a healthy engine — but this is not an official Triumph specification.
Kevin frazier
Widowmaker!
2.3s w 10:5:1 200ish, i would guess new 2.5s leave factory at 180ish but thats just a guess. Id think there is a lot of room for more on the 2.5s, stronger head, i cant wait till someone moves cams and gets some pressure on one of these new ones. 
TURBO200R4
stand up straight and grab the world by the a$$
i have seen threads that say the 2.5's have a compression release so taking a test might be a problem?
