Need HELP bad! Daily driver pony on last leg....

[Mike86Stang]

This all started by me blowing up my 300,000 mile original 86 motor , I replaced it with a used motor out of a MARK 7. It was running perfectly then one morning I start it up & it has a dead hole.

Used a boroscope to check it out (cyl 6) & the piston /cyl wall looks to be in good shape. Did a dry compression check I got 25 psi Then I put oil in it & got 35psi. All the other cylinders had good compression. So I yanked a valve cover & made sure the valves weren't binding. The springs/ valves/ pushrods were all in decent shape but I have a consistent rattle sound sounds like a motor when you're lugging it in a high gear at low RPM.

Now today on the way to work it started smoking like the car on spy hunter.
So I took off the filler cap & was waiting to feel a whole crap load of blow by, but to my suprise & total confusion I have VACUUM!!! Very slight but I have vacuum... I took a paper towel & wiped inside the tail pipe & there is ALOT of oil in the exhuast. So then I check oil level & all my oil is gone...

Can someone shed some light on all of this!!!

THANKS
Mike

 

[85Vertible]

Sounds like ring collaps. It should not have used up ALL the oil though. Sounds like you have a second failure as well. Is there any oil in the coolant?

Spy hunter was a Kool 80's video game!!

 

[the pony boy]

spy hunter ftw!!!

 

[Mike86Stang]

I did see a couple bubles of something not sure it it was coolant though... it wasn't signifigant enough to identify.

There's no oil on the dip stick now & there were oil droplets blowing out of the tail pipe.It's ALOT of oil....

Thanks
Mike

 

[Mike86Stang]

ftw?

 

[Mike86Stang]

BTW would I have blow by if the rings collapsed?

 

[Fox8950]

Usually when people say a "rattle" sound when you lug the motor I think detonation. Have seen this (my experience was from 2 separate genius friends running with WAY to much advance and/or crap gas) lead to a nice quarter size hole in the top of a piston on two occasions which dumped quite a nice amount of oil out the tailpipes but yeah a ring would also do this but I would think you would see some evidence of this on the cylinder walls and don't know if it would dump that much oil ( I know when I've broke rings my cylinder walls didn't look pretty)

 

[SuperStang83]

ftw?

For The Win

 

[bloopbloob]

is there any chance its engine bearings?