I'm placing this here cause i figure i'll get better answers than in the general crx/civic forum, and my main concern is whether or not these numbers would be acceptable to throw some boost at. Ok so my only concern with the testing is the engine was not at operating temp. i wanted to warm it up more but my friend said it would be alright. i guess you guys can tell me if he's right about that or not. it was warm because it was running like 2 hours or so previous, but it certainly wasn't hot enough to even register the slightest on the temp gauge. regardless he said it'd be fine.. you tell me. ok so here's the readings: this is with the psi on the input gauge reading around 25 psi i think, and the shop hose still connected to the unit. now i trust my friend with being able to do many things (2jz w/ 6spd into a mkIII swap), but i'm uncertain if i should trust these leakdown results : / cyl 1: 176 leakdown: 35% cyl 2: 175 leakdown: 30% cyl 3: 182 leakdown: 35% cyl 4: 178 leakdown: 30% On alldata it said anything from 135 psi to 199 psi was considered normal, with maximum variance between cylinders of 28 psi. also it occurs to me we forgot to hold the tb open while doing the compression test. whoops :/ Now from what i've read anything over 25% leakage is supposed to require a major rebuild? which certainly concerns me, and is making me wonder ok what the hells going on here. That aside the engine runs really well and doesn't burn oil *knocks on wood*. also what i found interesting is on the gauge itself anything less than 40% was in the green and considered low. 40-70 ish was moderate, 70+ was major leakage. i mean if the leakdown is accurate would it honestly even be running as well as it is? It seems odd to me that the compression is pretty decent and yet the leakdown test showed terrible numbers.. i guess i'm hoping that he screwed up the test somehow but im just not sure. i read on another site that the pressure coming into the cylinder should be like 80-100 psi, and from that you gauge how much loss their is. now if thats the case i'm not sure why the inlet pressure gauge was reading around 25psi or less.. So what do you guys think? i'm going to try and convince him to retest it later and see what happens. i'll make sure to get it up to proper operating temp this time. and i guess if it is leaking i'll try and isolate where from.