Going to look at 03 Cobra today. Compression Test question

Hi all,

Today I'm going to go look at a cobra. I want the dealer to perform a compression test on this before I make any decision on it. I've done some searching and found that you want 15% difference between each cylinder max. I'm just curious as to what numbers I should be looking for?

Some test results that I've seen while searching have had numbers in the 150's others have been as high as 180-190. Just curious as to what may be an alarming test result, and what may be considered perfectly normal test number wise? Or just look for the 15% regardless how high or low the results are.

Thanks for any help given,

Chris

Its about the difference between each cylinder. I thought the difference was no more than 10% across the cylinders though. If any of them come in less than this I would walk if you don’t want to plan on negotiating the price down to fix it.


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stone cold vs warm will change the numbers, differences in gauge accuracy etc... I would be most concerned with the variance unless they're all really low

DSG2003Mach1 said:

stone cold vs warm will change the numbers, differences in gauge accuracy etc... I would be most concerned with the variance unless they're all really low

Click to expand...

I agree 100%

Thanks guys everything checked out, and I ended up buying the car. it was 100% stock with only 9200 miles.

goocher1998gt said:

Thanks guys everything checked out, and I ended up buying the car. it was 100% stock with only 9200 miles.

Click to expand...

Pics or it didn't happen!

Congrats!

goocher1998gt said:

Thanks guys everything checked out, and I ended up buying the car. it was 100% stock with only 9200 miles.

Click to expand...

Pics or it didn't happen!

Congrats!

goocher1998gt said:

Thanks guys everything checked out, and I ended up buying the car. it was 100% stock with only 9200 miles.

Click to expand...

Pics or it didn't happen!

Congrats!