im new on here but not new to Hondas lol.
this is a built b18b. one day some how the crank pulley came loose, alternator lost power, car blew out black smoke and thank god it happen on my road I just drifted home.
car would rev up and 9x out of 10 it would rev to 5k rpms. and start missing real bad like it wouldn't rev any higher. check EVERYTHING I can assure you the distributor, ecu, injectors and spark plug gap everything is good. tested EVERYTHING ON A GOOD RUNNING CAR, and everything worked

so I did a a compression test 1-4, 180/180/170/175 I do believe
I did a leak down test and totally opened that bitch up, so it basically blew are into the cylinder. well, I blew air in #3 and I swear 75% of that air came out of #4! now im pissed off and ripped it all down. sleeves are not crack, head gasket looks good? only things I found were my catch can had milky oil in it! but my oil from the pan came out perfect! the really wet pic is #4 and the other is #3. seems like it had a lot of crank pressure when running. I did not get bubbles out of radiator when I blew air inside cylinders.




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you could have bent valves with the pulley letting go. coolant mix in oil and not oil in coolant is possible. with your compression numbers, im not sure its a headgasket issue. you're boosted, could be headlift, or an internal issue (cracked sleeve, etc) a crack doesnt need to be easily visible to ruin your day.

 

Wait, the crank pulley came off completely? That is sort of funny, I know it's not really but that is the first I have heard of an OEM damper doing that. There's a key there to prevent that from spinning, so what exactly happened there? Was it not torqued down fully?

You are lucky the valves and pistons didn't meet.

 

No, the pulley on the crank that drives te alternator not the timing belt. That shouldn't bend valves. It never went out of time. There is only milky oil in the catch can. When I drained the coolant and oil from
Motor everything looks perfect

 

Really.... the bolt backed out on mine and the woodruf key kicked doing the same thing. Previous mechanic didnt torque right.


Since this is the damper/pulley that drives accessory belts and alternator it does not/should not affect timing so valves and pistons would not meet.

I am at a loss on the rest of op's problems but this shouldnt affect anything else upon letting loose it took something else with it

 

The milky oil in the catch can is not a problem. Its the moisture in the hot air condensing in the catch can and mixing with the oil it catches. My catch can does the same thing when I drain it.

 

Never thought of that condensating... Wouldn't the moisture stick in the oil and return to the block and cause issues? Ill let you guys know what I find. I've never heard of any one cracking heads...I'm been messing with Hondas for years. Lol maybe I'm the first !

 

Ahh ok, your OP was rather confusing and I was only half awake.

You said you were losing compression though. Did you replace the headgasket I hope? Sounds like you just lifted the head a bit. You have head studs right?

 

Yes I have arps...they have been torqued plenty of times. Ordering new ones tonight. My head and block were resurfaced. I'm goin to make a dumby plate..and bolt it on the head with a gasket and put some pressure to it. Also I'm going to check to see if its warped. This miss fire problem was occurring under no load in nutruel @ 5000 rpm. Would the head still lift??