Guys check out my compression test results

[WhiteDevil]

Well the gauge was kinda old, so i might try again with a newer one but, here is what i got right now. Thanks ahead of time. Stock 104k heads

#4. 131 #8. 138

#3. 135 #7. 138

#2. 126 #6. 135

#1. 121 #5. 134

 

[stang_gt_1994]

#1 and #2 seem low. Between the highest and lowest numbers they should be less then 10% of each other and you look like you got more then that. Sorry man.

 

[1105]

All look good except #'s 1 and 2. You mainly want to see if the numbers are consistant for all cylinders... You might have done somewhing wrong with the first two that you didnt know. The rest look good.

 

[wytstang]

#1 & #2 are low like everyone else said

 

[stang_gt_1994]

Did you take all the plugs out when you did the test?

 

[WhiteDevil]

Yeah all the plugs were out when i did it

 

[Fast94Cobra]

numbers are low like everyone said, hopefully a mistake was made during the test

 

[WhiteDevil]

I think its the heads, that are causing the low compression. When i was pressurizing the cylinder to change the valve springs the #1 cylinder you could hear and feel the air leaking back through the intake manifold. Same but not as bad with the #2 cylinder.

 

[95stocker]

You might have communication between cylinders 1 and 2. Try putting a plug in cylinder 2 and testing cylinder 1, and vice versa. If you get higher compression when you do this then you have communication and you need a new head gasket. Also, here's something else to think about. You have 104K on these heads, there's a possibility that some of your valves aren't seating properly.

 

[HazMat404]

did you try a wet test too?? i say do another dry then wet test but you do have another vote for old valves not seating properly anymore

 

[WhiteDevil]

Yeah i agree with you guys on the valves not seating properly. Do you think that could be why my car breaks up and doesnt wanna revv past 5,400rpm?

 

[95stocker]

That would be your valve springs allowing the valves to float. The second time you revved your engine past 5,800 with stock springs it was time to change them. If you keep allowing it to happen you'll start breaking/bending valvetrain parts. I don't think you have any bent valves at this point, or your compression would be much lower on the cylinders in question(like next to nothing). At 104K you definately need new valve springs at the very least. As far as the valve seating goes, all the tests you can perform without taking the heads off are listed I do believe.

 

[WhiteDevil]

Well when i put the FMS 1.7 rockers on my car i put new stock valve springs, on it. I thought that would clear up the revving problem but no luck there.