Club G40 Forum

Technical => Engine and Transmission => Topic started by: xrrich on May 23, 2011, 07:02:08 pm

Title: Compression test results
Post by: xrrich on May 23, 2011, 07:02:08 pm: Got chance to get my hands on a compression tester, I had suspicions that head gasket was going, its leaking oil and water, and looks like there is oil in the water.

Results

Cylinder1- 145psi
Cylinder2- 150psi
Cylinder3- 155psi
Cylinder4- 155psi

I don't really know where to go from here, any help would be great

Cheers
Rich
Title: Re: Compression test results
Post by: Yoof on May 23, 2011, 07:41:02 pm: Rich,

Those pressures look strong, what colour are the plugs?

Could of course be fluid in the combustion chamber upping your CR ;)

Yoof
Title: Re: Compression test results
Post by: xrrich on May 23, 2011, 10:20:51 pm: Ah nice to hear, what is average pressures then?
The plugs were all dry slightly blacky,brown, they look normal.

Fluid in the combustion chamber upping my CR?

Thanks
Rich
Title: Re: Compression test results
Post by: djtez on May 27, 2011, 10:26:52 am: water or oil in the cylinder can seal up small gap's in the piston rings giving it a seal allowing it to up the compression.

i think (only thinking) 10 bar is quick good.
between 8/10 bar i think is acceptable..
but thats just memo from haynes..
Title: Re: Compression test results
Post by: Etches on September 01, 2014, 07:38:48 pm: Just to bump this thread up, I've ended up with a poorly G this weekend after winding the boost up. Boost was set to 21psi but it suffered a creep at top revs and something went pop and she overheated in a matter of seconds. My compression test results were as follows;

149 163 168 160

Wossner Pistons with 6n HG
Title: Re: Compression test results
Post by: Yoof on September 01, 2014, 08:06:28 pm: Pics of plugs :)
Title: Re: Compression test results
Post by: z3i on September 01, 2014, 08:59:24 pm: Just for the record incase people look at this thread for reference my results with acralite pistons 1341 BVH were

170/170/172/175