compression test on m8

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Aug 4, 2017 | 08:22 PM

djs

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compression test on m8

Had dealer do a compression test and a leak down test on a 2017 m8. Compression was 125 in each cyl and leak down 5%. Is this good?

Aug 4, 2017 | 08:43 PM

thereal142

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Joined: Sep 2007

Posts: 602

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From: central MN

Cranking pressure should be well over 200 psi. Something is not right with those numbers.

Aug 4, 2017 | 09:02 PM

stixvrad

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Joined: Nov 2016

Posts: 7,706

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From: Northern New Jersey

Quote:

Originally Posted by djs

Had dealer do a compression test and a leak down test on a 2017 m8. Compression was 125 in each cyl and leak down 5%. Is this good?

Why did you request a compression test? Actually surprised you could request that without cause.

Aug 4, 2017 | 09:03 PM

TriGeezer

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Joined: May 2012

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From: Carlsbad, CA

Quote:

Originally Posted by stixvrad

Why did you request a compression test? Actually surprised you could request that without cause.

Aug 4, 2017 | 09:30 PM

jclax01

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Joined: Apr 2013

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From: St Louis

this sounds about as right as a chicken with lips. and everyone knows that makes zero sense.

Aug 4, 2017 | 09:30 PM

sixguns

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Joined: Nov 2013

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From: SW Washington State

Quote:

Originally Posted by thereal142

Cranking pressure should be well over 200 psi. Something is not right with those numbers.

perhaps they failed to disable the CRV

Aug 5, 2017 | 12:16 AM

psyshack

Road Warrior

Joined: Sep 2016

Posts: 1,395

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From: Okmulgee

On a stock 107 per manual.

ACR connected - 110 psi min
ACR disconnected - 175 psi min

Leak Down Test,,, 25% or better further diagnoses.

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Aug 5, 2017 | 01:16 PM

thereal142

Road Captain

Joined: Sep 2007

Posts: 602

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From: central MN

Quote:

Originally Posted by psyshack

On a stock 107 per manual.

ACR connected - 110 psi min
ACR disconnected - 175 psi min

Leak Down Test,,, 25% or better further diagnoses.

I'm pretty sure someone on this forum said they were running over 200. I think it was someone like Steve Cole, Jamie Long, or someone else that seemed legit. Also, I would jump the starter to do the test. No spark, fuel, or ACR.
I could be wrong.

Last edited by thereal142; Aug 6, 2017 at 12:07 AM.

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Aug 5, 2017 | 03:53 PM

FLTRI17

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Joined: Sep 2009

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How did you hold the throttle blade open while doing the test?
Bob

Aug 5, 2017 | 04:10 PM

#10

splattttttt

Ultimate HDF Member

Joined: Jul 2014

Posts: 5,649

Likes: 430

From: MASS_hole

Take note djs asked here what the forum thinks of these results. Wonder why tech didn't offer their opnion? That is what's perplexing here

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