Compression test results

[s2_bo]

I ran another compression test today to see if the results would have changed much since the rebuild.

The results are:

The first column is just after rebuild: 0miles. The second one is 3 months after rebuild: 1500miles

Dry: ----------------- Dry:

Cyl 1 - 12.70bar ------- Cyl 1 - 13.50bar
Cyl 2 - 13.10bar ------- Cyl 2 - 13.80bar
Cyl 3 - 12.30bar ------- Cyl 3 - 13.70bar
Cyl 4 - 12.80bar ------- Cyl 4 - 13.80bar
Cyl 5 - 12.10bar ------- Cyl 5 - 13.00bar

Wet: ----------------- Wet:

Cyl 1 - 14.00bar ------- Cyl 1 - 16.30bar
Cyl 2 - 14.00bar ------- Cyl 2 - 16.00bar
Cyl 3 - 14.10bar ------- Cyl 3 - 15.40bar
Cyl 4 - 14.05bar ------- Cyl 4 - 16.30bar
Cyl 5 - 13.90bar ------- Cyl 5 - 16.00bar


On both accounts cyl 5 is a bit down, even still after i have ran the engine in a bit its holding .8bar less then cyl 4.

During the wet runs i tried to use an equal amount of oil in each cylinder.

The car runs ok, its giving .7 to .8bar boost at the moment on stock 3b software and is due a remap soon.


Can someone tell me if the above looks ok, or if it looks a bit problematic?

[AndyP]

According to the 3B Audi manual they should be 7-13bar when new with a maximum difference of 3bar between cylinders, so yours look spot on.

[s2_bo]

Ahh that's not so bad then, i thought max allowance was 1 bar.

Cheers Andy

[AndyP]

I'd say that Audi are being a bit 'generous' with that 3bar figure, most people aim for 1bar so your still ok.

[4WheelDrifter]

Looking good Bo. Bedding in nicely.

I can't remember which rings we used on your engine. I know I used 1 different set on my engine. Funnily enough cylinder number 5.

[S2central.net]

Chill cappin Bo - looks good to me... A spread of less than 1 bar across all five pots.

0.8bar on stock 3B software is fine... Do you want fries with that or what ?

[s2_bo]

Yeah, we used 4 packs of rings from gsf and one pack from audi, im guessing cyl 5 got the oem one.

Thanks for the offer of home fries Paul, but im going to go for a custom map which will be best for the combination of parts i have bolted to the car.. I hope so anyway.

[20Vcqdriver]

Just done a compression test on mine over the last few days in case I had a problem, all cylinders showed 160psi (11.0bar)after 108k miles so yours looks about right for a new engine.

[s2martyn]

mine measured 150psi across the range.with a fresh engine thats only ever been started up..i have 8;1 compression pistons with 2 headgaskets on

[MrVain]

looks good

My ABY had this last summer before i took it apart 230000km

cyl 1 8,2 bar
cyl 2 8,2 bar
cyl 3 8,1 bar
cyl 4 7,9 bar
cyl 5 7,8 bar

This was a dry test..

Still ran 13:34 on 402m

[s2_bo]

Thanks guys, much appreciated.