i did a compression test on my evo 9 yesterday. i just put in a 2.3 stroker kit and it has 300 miles on it. i also got a new head. my compression results were 125 125 125 125... should i be concerned?

 

one reason is aggressive cams.

 

I have Brian crowed 280 /280 cams in it

 

Mine was 126 / 130 /130 /130 on stock cams. But not sure if the tester was working great it was a Autozone rental.

 

My 10.5 compression 2.4 made 235 on all 4 with S2's in it. This was a snap on compression tester as well. Anything in the low 100's is worth investigating. I have had cars with 100 in all cylinders run great. Not a healthy motor but boost can make up for a lot. Even a stock 7.8:1 engine service limit is 130.

 

My stock 115k motor had 165 with hks 272 cams.

 

Ill try another compression tester mine was a rental as well from oreilly's .. Also are the intake and exhaust cam angle sensors interchangeable? And does anyone have a tps they want to sell?

 

my stock motor had 160-165 range with gsc s2 cams

9.2:1 2.3 motor has 185 with gsc s3 cams

 

Almost a decade thread, will aggressive cams lower the compression? Im seeing 155 on all my cylinder its a 2.3 btw

 

Is this with a warm engine? How many revolutions are you doing for the readings? But to answer your question yes a "bigger" camshaft will lower the compression readings. 150 seems low though.