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Mk5 2.5 turbo compression test

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Mk5 2.5 turbo compression test

Postby powercrazymark » Thu Nov 19, 2020 8:46 pm

Hi does anyone know what figures I should be looking at getting from 2.5 di turbo engine compression test? And what the lowest acceptable figure is? I know there should be no more than 10% difference between cylinders but what should I be getting?
Thanks
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Re: Mk5 2.5 turbo compression test

Postby gotgcoalman » Thu Nov 19, 2020 9:01 pm

Using a calibrated tester or off the shelf diy job?

If it's diy then take the max reading with a pinch of salt,but the 10% spread will still apply.


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Re: Mk5 2.5 turbo compression test

Postby powercrazymark » Fri Nov 20, 2020 8:00 pm

Calibrated tester with the proper dummy injector and seals
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Re: Mk5 2.5 turbo compression test

Postby Keef » Sat Nov 21, 2020 12:49 am

I did one of mine recently, I'm pretty sure the data was in the Haynes manual but I haven't got one here to check.
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Re: Mk5 2.5 turbo compression test

Postby Chug » Sat Nov 21, 2020 1:02 am

I've got 31 bar/450 psi in my head and anything below 25/26 bar is getting bad but I'm sure I have the correct figures somewhere.
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Re: Mk5 2.5 turbo compression test

Postby powercrazymark » Sat Nov 21, 2020 6:20 pm

So if what chug says is correct then we can assume that 245psi with no oil in the bores and 280psi with oil in the bores is definitely too low. Highest reading I can get is 300 psi with oil down the bore and there is definitely 10% variation on the cylinders
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Re: Mk5 2.5 turbo compression test

Postby powercrazymark » Tue Nov 24, 2020 10:12 pm

Can anyone confirm correct figures?
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Re: Mk5 2.5 turbo compression test

Postby dumper » Tue Nov 24, 2020 10:18 pm

Is the turbo engine lower compression then the non turbo I think I’ve seen it somewhere.
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Re: Mk5 2.5 turbo compression test

Postby powercrazymark » Tue Nov 24, 2020 10:26 pm

Yeah the turbo engine has a lower compression ratio than the non turbo engine.
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Re: Mk5 2.5 turbo compression test

Postby gotgcoalman » Tue Nov 24, 2020 11:04 pm

Is the spread within 10%

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Re: Mk5 2.5 turbo compression test

Postby powercrazymark » Tue Nov 24, 2020 11:07 pm

No its not within 10%
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Re: Mk5 2.5 turbo compression test

Postby Chug » Wed Nov 25, 2020 12:38 am

I still cannot find any info to confirm or refute that figure, even had a search with no luck so maybe I dreamt it :lol:
but it sounds similar to other diesel engines, and with your low readings and if there is a lot of variation between cyls then it's probably poorly.
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Re: Mk5 2.5 turbo compression test

Postby powercrazymark » Wed Nov 25, 2020 12:10 pm

I think it is poorly with the variation but just wanted to know how much lower it was than what it should be
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