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EvolutionM - Mitsubishi Lancer and Lancer Evolution Community (https://www.evolutionm.net/forums/)
-   Evo Engine / Turbo / Drivetrain (https://www.evolutionm.net/forums/evo-engine-turbo-drivetrain-22/)
-   -   low compression (https://www.evolutionm.net/forums/evo-engine-turbo-drivetrain/746801-low-compression.html)

RightSaid fred Mar 6, 2018 02:02 PM
Originally Posted by deylag (Post 11805184)
If there are any vacuum leaks on the intake manifold then that would cause less air to go into the cylinder when you crank.
Your statement makes no sense at all.

Originally Posted by 2006EvoIXer (Post 11805484)
Check intake cam lobes for cylinder 2 to make sure it is making full contact with rocker arms. If it does make tight contact, try to compress HLA under those two rocker arms. If they compress, HLA is probably leaking and not holding rocker arms fully up and allowing valvesprings to not fully open. This can also be the source of your lifter ticks.
It's not going to affect compression, if anything it'll go up due to the intake valve closing sooner

Originally Posted by nor11384 (Post 11805559)
Well, got a compression tester from autozone and all cylinders showed 153 except that one which showed 90 - 100. Poured a cup of oil and and it jumped to 120. :sigh:?
That test says it's a broken piston.

2006EvoIXer Mar 6, 2018 02:12 PM
Originally Posted by RightSaid fred (Post 11808073)

It's not going to affect compression, if anything it'll go up due to the intake valve closing sooner



That test says it's a broken piston.
You're right. A bad lifter will slam the valves shut. He better start saving up.
Has your buddy removed his cams recently and reinstalled without bleeding the lifters?

nor11384 Mar 6, 2018 03:07 PM
Not that I know of but always had bad lifter tick...

2006EvoIXer Mar 6, 2018 03:19 PM
Originally Posted by nor11384 (Post 11808089)
Not that I know of but always had bad lifter tick...
then it's likely not the lifters.

nor11384 Mar 6, 2018 03:40 PM
Why? Never took a compression test...could have been like this for a while...

RightSaid fred Mar 6, 2018 03:43 PM
Or multiple problems with multiple bad mods.

2006EvoIXer Mar 6, 2018 03:58 PM
Originally Posted by nor11384 (Post 11808098)
Why? Never took a compression test...could have been like this for a while...
only way I can think of caused by lifters is if someon swaps out cams and didn't bleed the lifters. As they reinstall the cams they could compress some accidentally when installing new cams. Then lifters would rest high and under pressure, holding valves open.

nor11384 Mar 6, 2018 04:15 PM
Well, lets see...i plan on pulling the head and see if i can see anything...may have machine shop test it and see if valves were closing as they should...maybe it was carbon build up or something?

2006EvoIXer Mar 6, 2018 04:33 PM
Originally Posted by nor11384 (Post 11808112)
Well, lets see...i plan on pulling the head and see if i can see anything...may have machine shop test it and see if valves were closing as they should...maybe it was carbon build up or something?
use an othoscope and look inside through spark plug hole. They're so cheap and I think it's about $30 on Amazon.

nor11384 Mar 6, 2018 04:44 PM
Yeah i could try that and see if something sticks out...

2006EvoIXer Mar 6, 2018 04:50 PM
Originally Posted by nor11384 (Post 11808130)
Yeah i could try that and see if something sticks out...
that's the easieat thing to do. Also check cylinder 2 walls for signs of wear. I can see cross-hatches when I last looked in my cylinders.

nor11384 Mar 7, 2018 04:39 AM
Yeah I have a buddy that has one. Going to try that and see. Well he actually has one of those cheap wires from wish that you hook up to your phone but that’ll work. I think you can take screenshots so if I can do that I’ll post pics here.


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