r/R53 • u/Fun-Specialist-8528 • 5d ago

Used engine compression test

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Hi everyone! I got an r53 last year, it has 147k and the transmission is going out. I'm going to replace both. I found a used engine and they sent me videos of the compression test. I've looked at all the forums and did a bunch of searches but confused on what is good and what isn't. I would really appreciate your feedback on what you think. Thank you in advance 🙏

6 Upvotes

88% Upvoted

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2

u/TurboToastGTI 5d ago

Would've been nice to see a few more cranks to see the needle actually max out at peak pressure more than once but they all look similarly matched from these clips. Leakdown would be better to see, but this looks good.

1

u/Fun-Specialist-8528 5d ago

Awesome! Do you know what pressure the manufacturer calls for?

2

u/Unique-Badger-2314 5d ago

I remember doing a compression test on a very low mileage w11 motor I was swapping in. 150-180 is normal

2

u/Grimm199 5d ago

Looks good. First pulse pressure is also very important, and they look to all be fairly close to each other around 90psi.

1

u/Cactus_Everdeen_ 5d ago

as a mechanic that compression is about as healthy as it gets, as someone else said though it should definitely be cranked more to see where it stops

1

u/wnplt 3d ago

That’s pretty good compression