ok, went ahead and did a comp check while the plugs were out- came up with 210-215-212-215...now that odd part is that the numbers have done nothing but go up since turboing....last sept while NA, i got 200-205-205-200... a month ago after becoming turbo, they were 210 across....and now nearly 215 across...can someone help me understand why my compression is increasing????

Maybe the weather? Right now theres a big H over the east coast. Try it again when theres a L. The other thing that I can think of is carbon buildup. Compression will increase when carbon builds up in the combustion chamber and on the piston top. Sounds to me like your engine is in great shape.


95 Eclipse RS : 5 speed
15.943 @ 86.48mph
Jeep TB writeup - http://www.dimensia.com:81/jimbo/JeepTBfor2gnt.html

Yea, carbon buildup, elevation, and temperature are the only things that would do that. Are you running pretty rich?

is that a rehtorical question?? its a 420a, of course its rich, but no richer than it has been for the last 40,000 miles...in general the altitude, temp and weather have all been equal...