All Things Mk5 > Members Rides
Sunset Red 1.4 TSI(TFSI) GT Sport - daily drive & track car
fuscobal:
Hurdy, I don't think we can compare the 2. Yours and mine are the turbocharged & compressor 180HP version while rex's engine is the older turbocharged only 122HP version so they might have different compression indeed !
Hurdy:
That is what I thought Fuscobal :happy2: and why I asked if he had any guidelines as to what the pressure should be when testing.
rex:
--- Quote from: fuscobal on June 29, 2012, 09:50:47 pm ---Took a look today with my mechanic in VW technical papers and it seems a difference of 3bar between cylinders is accepted !?!? That's quite weird so I read it 2 times to be sure !
--- End quote ---
Yup... that is strange...
During one test that shows the overall efficiency on all cylinders (compression, spark, fuel injection) one cylinder was at 70-75% and the software said it is only a "warning" not an "error". At times it would go below 70% and than the system would tell me that this behavior is not acceptable (but at times it would also go back to 100% on the same cylinder).
--- Quote from: Hurdy on June 30, 2012, 12:04:20 am ---Any guidelines as to what pressure they should be running. I'm sure when I had mine tested they were 175-180psi = 12.4bar but it may be that mine run a higher pressure than yours?
--- End quote ---
--- Quote from: Hurdy on June 30, 2012, 07:58:02 am ---That is what I thought Fuscobal :happy2: and why I asked if he had any guidelines as to what the pressure should be when testing.
--- End quote ---
Unfortunately I found no guidelines to the absolute pressure. I only found the ratio value which is 10.1 for both our engines. I will visit my VW dealer to see his thoughts (he investigated a similar problem with a 170bhp twincharged 1.4 TSI engine with random missfire issues above 6500 RPM and found some deposits on the valves and a loose timing belt and I am curious to see his opinion. From that the owner of this car told me there might be a recall on the timing belt issue for some models...).
Thanks for sharing your thoughts!
:drinking:
rich83:
If the compression ratio is 10.1, you should see 10.1 times atmospheric pressure when the cylinder is in compression. So ~ 10bar
rex:
Thank you for the info! :notworthy:
Hurdy... if the compression ratio is the same why do you have 12 bar compression pressure?
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