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Author Topic: compression test  (Read 1534 times)

Offline davidgtrr34

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compression test
« on: 25 January 2014, 15:22 »
I have no power and a knocking noise. the noise gets louder when I rev it and stops when I let off the throttle.
I done a compression test and these are the results

cylinder 1 - 35psi
cylinder 2 - 30psi
cylinder 3 - 30psi
cylinder 4 - 30psi

the car still starts and runs.
can anyone help?
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2004 auq, 550cc injectors, gt3071r, adjustable fpr, ebc, fmic, sachs stage 2, walbro 255, 3" turbo back, 3" custom intake, n75 n249 sai delete.
http://s103.photobucket.com/user/davidgtrr34/media/Mobile%20Uploads/20140531_192129_zpsgud6vsfb.jpg.html

Offline maxey

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Re: compression test
« Reply #1 on: 25 January 2014, 19:12 »
I have the same problem mate, does it shack like mad?
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Offline davidgtrr34

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Re: compression test
« Reply #2 on: 25 January 2014, 19:25 »
Not really.but im gettin alot of fault codes and no boost
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2004 auq, 550cc injectors, gt3071r, adjustable fpr, ebc, fmic, sachs stage 2, walbro 255, 3" turbo back, 3" custom intake, n75 n249 sai delete.
http://s103.photobucket.com/user/davidgtrr34/media/Mobile%20Uploads/20140531_192129_zpsgud6vsfb.jpg.html

Offline rockmonkey69

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Re: compression test
« Reply #3 on: 26 January 2014, 11:05 »
Those figures seem a tad low, very low. I'm surprised the engine is even running. Looks like its time for a rebuild, new engine or new car
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Offline xxChrisxx

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Re: compression test
« Reply #4 on: 26 January 2014, 11:23 »
Those values are too low to be real. I'd try doing again with a different gauge.

Working order is approx 12.5 bar.
Wear limit is 7 bar.

For anything to be massively below that the timing has to be out, allowing one of the valves to be open.
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Offline davidgtrr34

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Re: compression test
« Reply #5 on: 26 January 2014, 13:19 »
Ill test again with a different kit. The timing seems to be fine
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2004 auq, 550cc injectors, gt3071r, adjustable fpr, ebc, fmic, sachs stage 2, walbro 255, 3" turbo back, 3" custom intake, n75 n249 sai delete.
http://s103.photobucket.com/user/davidgtrr34/media/Mobile%20Uploads/20140531_192129_zpsgud6vsfb.jpg.html

Offline Wayne

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Re: compression test
« Reply #6 on: 26 January 2014, 20:49 »
I would get another gauge and try again
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