My z6 smokes almost instantly in the engine bay when started....leaks quite a bit of oil...and just doesn't have what she used to as far as power goes.

So i did a compression test tonight.

1: 110
2: 170
3: 150
4: 150

Now cyl. 1 went up to 135sh when i added some oil in the spark plug hole.

I assume it's blown rings....but my engine bay smokes pretty bad....cannot trace the leak....although it's around cyl #1.

Friends dad said i might have a cracked cylinder head. Strong possibility i guess.

Spark plugs looked OK, aside from oil around the bottom of the thread.

btw...motor is boosted, and has been for about 3 years now. Stock head/bottom end. 10psi daily 15 high boost. If this is the end for the motor...nothing but

Hope i can get some more definitive answers.
Thanks HT

 

sounds like my buddies car. all you can do is pull it apart, have the head checked. Then have the block checked out. If you had fried piston rings they all would be low on compression not just one. My friend broke the part of the piston that separates the rings about 1/3 the way around, it was still held in place by the rings but was leaking compression. You could just buy a replacement stock block, but it will be better to build the block with stonger parts

they are sopposed to be with in 10psi of each other.

 

You'll find either broken Piston Ring Lands or a partially melted piston on the #1 cylinder. More than likely due to a lean run or excessive boost.
Either way, you'll be looking at (at minimum) a Piston / Ring assembly and a possible Cylinder Sleeve.
Most likely, you'll find additional damage to the other cylinders as well.

P

 

OK OK , now we're getting somewhere...

Any reason why the engine bay fills up with smoke once the car is started?!

I kinda expected a build to come sooner or later. Glad it held off this long.
Buying a house = no car build for long time

Good thing: I have a spare block/ECU for future use already. Also, it's wintertime, so i'm not gonna be able to drive it anyway...thank god

 

Oil leak on a hot manifold???
I doubt it perforated the block, so it's more than likely something minor (Maybe)

P

 

Excessive Blow By past worn rings is overpressurizing the crankcase blowing some oil seals, replace your PCV valve and hose, clean the entire engine a few times with Scrubbing Bubbles bathroom cleaner then monitor for oil leaks, such as valve cover leaking onto the exhaust manifold right in front of the engine and/or leaking down the back of the engine and landing on top of the exhaust pipe, this also goes for the oil pan gasket leaking on top of the exhaust pipe.

Dont fix the oil leaks until you tear down the engine to see what happened internally though, but do at least go ahead and see where they are coming from. Fixing a known leak will just force the next weaker seal to start leaking soon with all your blow by, thats my opinion anyways.

 

Address everything at the same time.
It will make no sense to repair oil leaks on a non-viable engine.
Put the car away and assign it as a winter project.

P

 

Well, like i said, I have a spare motor. So the block/head in the car now will not be used if i do a build. Hopefully that will avoid some issues.

Thanks HT.