How To | Compression Test on a N55 Engine | BMW 535i F10

In this video I perform a compression test on my 2011 BMW 535i. I was a donkey and ran the engine a little too hot, so now I'm checking its health.
Here's a link to the kit I bought on Amazon.com, it worked well enough:
www.amazon.com...

[@diesel.bimmer]

the calculations to determine if the engine was healthy or not at @8:11 was extremely helpful. thank you for explaining it as well. got my subscription

[@SingleMaltMotors]

Thanks friend

[@durhamregionseedbank2710]

The fuse panel is in the trunk. Way easier.. just take the pump fuse out...

[@SingleMaltMotors]

Thanks my friend

[@f10_dav3]

Great video

[@SingleMaltMotors]

Thanks friend

[@786motorsport]

I saw another video they used a computer to activate the throttle this way the throttle can be open while they do the test you didn’t do that but the test came out fine.

[@SingleMaltMotors]

Good info, thank you friend

[@user-gs6tj7vo6l]

Здравствуйте а подскажите пожалуйста где вы покупаете пирпатроны ?

[@SingleMaltMotors]

Я купил комплект сжатия на Amazon, надеюсь, это поможет.

[@landenmerren1497]

Old vid but hopefully you answer. How long roughly did you crank it for if you remember? I did it for 5 seconds and only got 175 through all 6 cylinders I wonder if I needed to crank for a lot longer

[@SingleMaltMotors]

Hi fried, glad to help. 5-6 seconds should be enough. You only need to crank until the reading maxes out. If you're worried about low readings, try again with 1-2 cylinders and let it crank longer. If you get higher readings, keep going through all cylinders. At the end of the day, it's important to have consistency, so your reading could be good as is.

[@landenmerren1497]

@MOTOVA Thank you for the reply. Still worries me though even though they're all consistent seems like other people on the web are getting 200. And Gassan auto has a post saying if under 180 that's a worry

[@SingleMaltMotors]

@@landenmerren1497 Understood. For some peace of mind, a good rule to consider is a minimum of 100 psi per cylinder, and a maximum difference of 25% between each cylinder. You might start to worry if one of your cylinders is getting close to 100 psi, but that's not your case. Most new engines in good condition compress at around 175 psi.

[@SingleMaltMotors]

One last thought: if you're still concerned, it couldn't hurt to run the test again and let it crank a little longer, e.g., 10 seconds, just to ensure you've reached max readings. But for peace of mind, remember that consistency is equally important to PSI.