compression results- whaddya think?

[211]

3: 180 4: 160

 

1: 170 2: 180

 

157k mi, 85 GL wagon EA82 carbed.

[idosubaru]

relative to each other they seem good.

[nipper]

3: 180 4: 160

 

1: 170 2: 180

 

157k mi, 85 GL wagon EA82 carbed.

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10 % of 180 is 18, so that puts your lowest number 162. All in all, I would say that your numbers are fine, especially for that mileage.

 

170-180 is considered compression for a new engine.

 

I was trying to find you a nice chart on the net, but man ive seen sites saying anywhere from 5% to 25 % is ok.

 

http://www.motorage.com/motorage/article/articleDetail.jsp?id=16170

 

i wouldnt worry about 2psi differnce, as that can be human error in the way its done.

 

you have a realtivly solid engine.

 

nipper

[eggroller]

I just re-sealed my engine. While I had it apart I noticed that my 207,000+ mile engine had a TON of carbon on the pistons. To the point that I am sure that it is messing with the compression. Notice the different colored spark plugs?

 

Picture of the cylinder head for 1 & 3

 

Picture of the cylinder head for 2 & 4

 

Picture of the cylinder pistons 1 & 3

 

Picture of the cylinder pistons 2 & 4

 

 

My solution? Seafoam the engine. The car is still currently apart. But, I doubt that I will be taking the car apart to see if it worked. Many here trust this stuff. Seafoam just might help even out the numbers. Specifically, lower the highest numbers.

[naru]

Never mind the spark plugs.The colour of the exhaust valves is a better indicator of compression.In general,the lighter the colour,the higher the compression.Normal is sorta light tan.The dark valve indicates low compression/oil consumption.