Hello, i'm new to these forums. Tried searching around and can't find my specific problem so I figured i'd make an account and ask away.
(Bit of back story, not exactly required to know the problem.)
I got this 86 mustang GT on trade for my YZF R1 a while back (the mustang didn't run when I traded due to them having a plate covering the MAF sensor, removed the plate and it fired right up and ran great..... it has stock injectors, i'd assume that plate was tricking the ECU into thinking it had different sized injectors). it also had a really bad vibration over 3Krpms, eventually the rear main seal went out so I replaced it, then it went out again a few weeks later, so I figured it was probably being caused by whatever is causing the vibration.
I then decided i'll just buy another 302 roller bottom end for $100 and slap everything from my current 302 onto it and that's what I did with a 1987 lincoln town car roller 302 flat top cast pistons and all (yes I checked the PTV clearance with a solid lifter, play dough, and old head gasket in place. not exactly sure how but the valves were fairly far away form the pistons after about 4 full rotations of the engine ((flat top 87 town car cast pistons, e303 cam, E7TE heads, Compcams magnum push rods can't remember the number listed on them)))
(problem)
Now to get to the problem at hand, I have all new bearings, all bolts threadlocked, all new quality gaskets, all bolts tightened to torque spec with the correct sequence put 500 miles of low load low rpm driving (about 3500rpm, 50% throttle at most) changed the break in dino oil out, put in mobile 1 full synthetic 5w30 with a new filter, drove another 20 miles to make sure everything was still ok as up to this point nothing was leaking at all... then i got on it a bit, pulls amazing, runs great.
So I decide to do a good run through a few gears, hard pull from second to 3rd, all is good, then at the top of 3rd I started seeing what looked like steam spraying up near the dip stick and it very lightly misted my window. ((I was driving with no hood when doing the pulls as I was to lazy to mess with the stupid screws that hold it on... it's not a hinged hood.))
I got back to the garage and looked, it dripped a small amount of oil under the car, but I couldn't see anywhere oil could have possibly been coming from, the dipstick was fully seated and oil free, the bottom of the dipstick where it goes into the block was also dry, but my spark plug heat shield was soaked in engine oil and it just ran down the side of the block... I can't see anywhere it could possibly be leaking but it certainly is spraying when under continuous heavy load.
(What I already tried)
I have tried a few things like cleaning the oil off the block, lying under it while a friend holds the rpms up around 4K to try to spot the leak, but it doesn't show up unless the engine is under heavy load for a bit of time.
I have since driven it a few times to see if I can recreate the leak, it does this every time. I can really get it to spray good while doing a burnout even when I drop the RPMs to 2K while doing a fully stopped burnout (oil pressure is pretty good, right in the middle during warm idle, probably about 3/4 with higher rpms.)
(Sorry... I just noticed how much I typed.)
Any ideas?
((yes the new bottom fixed the vibration issue I was having, the old bottom end has aftermarket parts that aren't balanced, or aren't balanced for a 50oz imbalance, the rear main bearing was oddly broken as well, not spun or cut up looking, but a chunk of it was missing, i'll have to take a picture of it eventually as i have never seen anything like it.))
(Bit of back story, not exactly required to know the problem.)
I got this 86 mustang GT on trade for my YZF R1 a while back (the mustang didn't run when I traded due to them having a plate covering the MAF sensor, removed the plate and it fired right up and ran great..... it has stock injectors, i'd assume that plate was tricking the ECU into thinking it had different sized injectors). it also had a really bad vibration over 3Krpms, eventually the rear main seal went out so I replaced it, then it went out again a few weeks later, so I figured it was probably being caused by whatever is causing the vibration.
I then decided i'll just buy another 302 roller bottom end for $100 and slap everything from my current 302 onto it and that's what I did with a 1987 lincoln town car roller 302 flat top cast pistons and all (yes I checked the PTV clearance with a solid lifter, play dough, and old head gasket in place. not exactly sure how but the valves were fairly far away form the pistons after about 4 full rotations of the engine ((flat top 87 town car cast pistons, e303 cam, E7TE heads, Compcams magnum push rods can't remember the number listed on them)))
(problem)
Now to get to the problem at hand, I have all new bearings, all bolts threadlocked, all new quality gaskets, all bolts tightened to torque spec with the correct sequence put 500 miles of low load low rpm driving (about 3500rpm, 50% throttle at most) changed the break in dino oil out, put in mobile 1 full synthetic 5w30 with a new filter, drove another 20 miles to make sure everything was still ok as up to this point nothing was leaking at all... then i got on it a bit, pulls amazing, runs great.
So I decide to do a good run through a few gears, hard pull from second to 3rd, all is good, then at the top of 3rd I started seeing what looked like steam spraying up near the dip stick and it very lightly misted my window. ((I was driving with no hood when doing the pulls as I was to lazy to mess with the stupid screws that hold it on... it's not a hinged hood.))
I got back to the garage and looked, it dripped a small amount of oil under the car, but I couldn't see anywhere oil could have possibly been coming from, the dipstick was fully seated and oil free, the bottom of the dipstick where it goes into the block was also dry, but my spark plug heat shield was soaked in engine oil and it just ran down the side of the block... I can't see anywhere it could possibly be leaking but it certainly is spraying when under continuous heavy load.
(What I already tried)
I have tried a few things like cleaning the oil off the block, lying under it while a friend holds the rpms up around 4K to try to spot the leak, but it doesn't show up unless the engine is under heavy load for a bit of time.
I have since driven it a few times to see if I can recreate the leak, it does this every time. I can really get it to spray good while doing a burnout even when I drop the RPMs to 2K while doing a fully stopped burnout (oil pressure is pretty good, right in the middle during warm idle, probably about 3/4 with higher rpms.)
(Sorry... I just noticed how much I typed.)
Any ideas?
((yes the new bottom fixed the vibration issue I was having, the old bottom end has aftermarket parts that aren't balanced, or aren't balanced for a 50oz imbalance, the rear main bearing was oddly broken as well, not spun or cut up looking, but a chunk of it was missing, i'll have to take a picture of it eventually as i have never seen anything like it.))
