[dodgestang]

I was helping my buddy with his 94 mustang with a procharger on it. When he bought it it was missing a head bolt on one side and broken one on the other. Tore it all apart and swapped in a new low mileage bottom end. Finally up to the tuning phases, it idles when cold, when it warmed up it would surge and it had some other squeaks and annoying noises.
Was working through them all (things like inter cooler plumbing clamps banging on the pulleys etc...) Worked through them all.

Do a short test drive on the driveway

Then back it down and let it sit there to idle to let it warm up enough for the surge to start so we could start playing with sensors and see if we could resolve and then whammo all kinds of clattering sounds like a rockers fell off. Sounds like the driver side...pull the cover, crank the motor, all rockers on and opening and closing. Pull the throttle body, pull the passenger side valve cover, crank the motor, all rockers on and opening.

Then we open the air intake inspection plate. :skullnbones:

Green/black sludge and metal bits everywhere.

WTF.

Feeling really bad since it happened at my house....but WTH happened? Its like the procharger came apart and blew all kinda of crap into the motor and it is all now basically gone.

 

[Huskinhano]

Nick, IMO considering the head bolts were f'd up, I wouldn't be surprised to see something else fail. I think you were on borrowed time.

 

[dodgestang]

We tore it down, swapped in a new bottom end (new crank, rods, piston, block), swapped over the cam and lifters, put in all new ARP head bolts, and ran the heads through a machine shop.

 

[Huskinhano]

I'd say the Procharger took a dump and undid all your work. It sucks when you've worked on something and it fails for what ever reason. Many years ago I was going to electronics school at night. One of the guys I made friends with had a 70 Camaro with a BB 402. He use to like driving it at 100 MPH on his way to work. One day his oil pump sucked up a bunch of nylon teeth from the cam sprocket and spun a rod bearing. He was one of those types who shouldn't be allowed to own tools. He took the engine out and apart. He didn't have a clue what to do next and begged me to help him. When I saw the rod bearing spun I told him the rods needed to be resized. He said he didn't have the money for the machine shop work and just wanted me to put the engine back together with new bearings after I removed of what was left on the rod from the old bearing. I kept insisting he needed the rods resized but kept telling me he didn't have the money.

Then all of a sudden he had money for a Lunati cam, Holley carb, headers. Well, it was quiet during the cam break in.... After that the rod knock came back. I washed my hands after that.

 

[dodgestang]

I'm not sure the procharger fell apart....but without tearing it all apart I am at a lose to explain all the crap in the intake, metal bits, oil/anti freeze sludge....is it possible a valve came apart and the boost blew it all up into the intake during the compression stroke with an open intake valve? There is nothing in the throttle body pipe in terms of metal bits.

 

[dobrostang]

Explanation is simple with performance cars: Win some - Lose some...

 

[BigTang]

you lost me at air intake inspection plate.

is this car running a traditional upper/lower? are their parts in the plenum of the upper? or primarily in the lower.

check the intake gaskets, could it have not sealed and coolant got in the intake, broken valve, etc..

its simple enough to pull the intake may as well start there.

 

[dodgestang]

Looking in the blower the impeller appears to have come apart.

It is a trick flow upper and lower. The upper has an inspection plate you can unbolt and look into all along the opposite side from the throttle body

Like this edelbrock one

 

[patrickstapler]

I say the blower took a dump. Happened to my brother-in-law a couple years ago.

 

[Danimal]

Wow, dude, that sucks big time!

 

[sportsroof69]

Explanation is simple with performance cars: Win some - Lose some...

Isn't that the truth. I almost sold my car due to its need to mysteriously eat itself for a while.

 

[cyclone03]

In the airplane world it would be call FOD (Foreign Object Damage).
Lock for the lost screw or bolt or rock or pebel.

 

[dodgestang]

Good news/bad news.

Turns out the blower is just fine.

Turns out there is a hole in piston #8

 

[67 Evil Eleanor]

Forged rods and pistons? Did you rescale the fuel and timing MAP?

 

[dodgestang]

Forged rods and pistons? Did you rescale the fuel and timing MAP?

This was low budget 'get it on the road'....we swapped in a stock 5.0 bottom end (the one with forged pistons) and the car already been together so had the fuel system, the tune in the PC, the injectors, all that crap...it was 'supposed' to be an easy in and out. It had an overheating problem when he bought which was tracked to a missing head bolt on one side and a broken one on the other (which led to a blown head gasket, oil/coolant soup, so we jacked up the top of the motor and parked a new equivalent bottom end under it.