#1: compression test Author: Dan-, Location: BiggleswadePosted: Sat Oct 08, 2011 8:43 am ---- I'm going to perform a compression test on my 180 just wondered if anybody knows what the average reading should be, or do I just test them all and see, also is it best to doit with all plugs removed or just the one your testing
Thanks Dan
#2: Re: compression test Author: macj, Location: EssexPosted: Sat Oct 08, 2011 8:46 am ---- test all cylinders and compare the results. remove all plugs and do each cylinder in turn. You only need to crank it a few cycles each time.
Show your results on here for a diagnosis
Use a screw in CT by the way
#3: Re: compression test Author: Lee, Location: EnglandPosted: Sat Oct 08, 2011 8:52 am ---- They should be within about 10% of each other shouldn't they?
#4: Re: compression test Author: macj, Location: EssexPosted: Sat Oct 08, 2011 8:53 am ----
Lee wrote:
They should be within about 10% of each other shouldn't they?
Yes they should.... keeping the plugs for each cylinder in order can be useful too
#5: Re: compression test Author: Dan-, Location: BiggleswadePosted: Sat Oct 08, 2011 8:59 am ---- Thanks I will do, I think its a screw in 1 he's got, i hope there all around the same
#6: Re: compression test Author: Dan-, Location: BiggleswadePosted: Sun Oct 09, 2011 5:47 am ---- Just done my compression test, the results are cylinder 1: 148psi, 2: 150, 3: 152, 4: 150
Do them results sound about right
Thanks Dan
#7: Re: compression test Author: Mattie-RS, Location: A Track near you ;)Posted: Sun Oct 09, 2011 6:50 am ---- There all round about the same so yea
#8: Re: compression test Author: macj, Location: EssexPosted: Sun Oct 09, 2011 7:00 am ---- not a lot wrong there.... why did you test it. Was something not right?
#9: Re: compression test Author: Dan-, Location: BiggleswadePosted: Sun Oct 09, 2011 7:34 am ---- That's okay then my friend just had 1 so thought I would just check them
#10: Re: compression test Author: Dan-, Location: BiggleswadePosted: Sun Oct 09, 2011 7:59 am ---- Also would it be normal for it to bring on Eml after, it has now turned off but took a drive and a turn off turn on to do so, the only reason I can think it came on is due to turning the car over with no coil pack plugged in,
#11: Re: compression test Author: Lee, Location: EnglandPosted: Sun Oct 09, 2011 8:00 am ---- Yeah that sounds plausible due to the ECU detecting a error
#12: Re: compression test Author: Dan-, Location: BiggleswadePosted: Sun Oct 09, 2011 11:20 am ---- I hope that was the cause, ill plug it in on the scanner next week and see
#13: Re: compression test Author: Seabook, Posted: Sun Oct 09, 2011 12:09 pm ---- don't quote on me but the value seems low to me
#14: Re: compression test Author: Schumi, Location: Istanbul / TurkeyPosted: Sun Oct 09, 2011 1:52 pm ---- I think its to low. 100.000 km GTI138 engine giving 160 psi with stock 10.8:1 compression ratio. 11:1 CR GTI180 engine should be much more than GTI138. I guess 165-170.
#15: Re: compression test Author: Dan-, Location: BiggleswadePosted: Sun Oct 09, 2011 2:15 pm ---- Hmm well I did only let it turn over twice or so, that could be why I hope
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my friend just had 1 so thought I would just check them
