Hanks URQ 2.6L Autopsy

[Mushasho!]

I guess we found the limit of those fasteners....

[audifreakjim]

Stinks!

[Quattro v1.0]

Oh sure, I thought we were gonna keep this on the down-low.

Otherwise there woulda been pics of the Abarth towing the UrQ...

[pilihp2]

Dude bummer. So no rides at 41 psi when I'm down for Wuste? Bummmmmer.
I'm surprised the head came out okay! Minus valves of course.
Sad to hear but excited for the next stage!

[Hank]

Jimmy brings up a good point, rod bolts shouldn't fail because of power, mostly RPM. I overlooked it because this failure looks so certain to be a rod bolt failure on the "through the window" autopsy.

[85oceanic]

quattro v1.0 wrote:[/quote]

Oh sure, I thought we were gonna keep this on the down-low.

Otherwise there woulda been pics of the Abarth towing the UrQ...[/quote]

Now that I wanna see!

[scubadave]

quattro v1.0 wrote:[/quote]

Oh sure, I thought we were gonna keep this on the down-low.

Otherwise there woulda been pics of the Abarth towing the UrQ...[/quote]

:bullshits:

Shenanigans.

[scubadave]

Damn, Just saw this. everybody pretty much comes to the same conclusion at first. lol you did it on purpose. you just wanted an 07k. I felt that way too but logic states you dont really like to flush money down the drain. bummer....again...How many does that make now?

[pkw]

So what actually happened? Hard to picture a rod bolt failing from tq instead of rpm but your rpm was not something that one would think would kill a good rod bolt in a such short time. I mean your rpm was high enough to cut into reliability but not insane rpm that would make it happen crazy soon. Odd. Or did I miss something and come to find out it was the rod that failed? Interesting. Sorry about your loss though.

[Hank]

It may have been just a rod failure. and the bent rod hitting the cylinder wall was enough force to tear the cap off with the bolts. The bolts are pretty sheared. I haven't given a full inspection, but the other pistons appeared to be find and at correct TDC heights. I suppose there is a chance that cyclic stretching of rod bolts at 8500 just happened to let loose at a lowish rpm of around 4700 when it let loose.

[scubadave]

quattro v1.0 wrote:

Oh sure, I thought we were gonna keep this on the down-low.

Otherwise there woulda been pics of the Abarth towing the UrQ...[/quote]

:bullshits:

Shenanigans.[/quote]

[pkw]

I want to shake down at Spring Mountain on April 14th. Might throw a stock engine in there to work out kinks while I build a bottom end. At 500$ a motor, why not?

that would be interesting to see how it can take until it breaks and what breaks. I know there is some data out there but more would not hurt. Thanks for pushing things and sharing the data. I know it is a lot of time and money invested. sorry again about the tall deck letting go Hank.

[pkw]

There are quit a few engines with some stroke to them that get run pretty hard up around 10k rpm and the bolts do not let go so soon. Rod bolts seem unlikely unless not torqued right or QC issue. A rod would just love to let go at torque peak. I just caught that is when it happened. Could have been the limit of a Chinese rod. They may be plenty good for most builds, but we all knew there are better ones out there with even more strength.

[Quattro v1.0]

It may have been just a rod failure. and the bent rod hitting the cylinder wall was enough force to tear the cap off with the bolts. The bolts are pretty sheared. I haven't given a full inspection, but the other pistons appeared to be find and at correct TDC heights. I suppose there is a chance that cyclic stretching of rod bolts at 8500 just happened to let loose at a lowish rpm of around 4700 when it let loose.

The top end looked great, the only mark on the piston was the valve interference.
Piston pin wasn't bound up or discolored.
The crank journal looked great, no discoloration or scoring (of course there might be something we didn't see upon removal)

I have to lean towards fatigued hardware as well, rod ratio comes at the expense of piston speed.

[Hank]

Well, mean piston speed is identical for any length of rod, but yeah, it looked like failed hardware from where we were looking. Time will tell.

[OOOOGT]

Sad to hear, but man that must've been a thrill at 40+psi! What boost were you running at the BBQ when I got a ride?
The 07K just means more room for a bigger IC and more boost!

[Toph]

Damn, that's sad to hear, Hank. I'm with Alex, that thing was nuts at 18psi...nevermind 40+!

My only issue is that you couldn't wait another week for when I'm in Vegas to pop it. Quick, 07k it, i expect a test ride on the 18th lol

[my2000apb]

yay end of an era, i need slugs!!!!!!!

[RSCoupe]

Durability test: COMPLETED

[my2000apb]

this is the best bad news EVAR!!!

[Audilard]

You've had all weekend to throw in a 07k.....well?

[URQ]

Ohhhh that sucks!

[death 4kqt]

42psi....hah, must have been wild

[EDIGREG]

damn.

[PRA4WX]

You've had all weekend to throw in a 07k.....well?

:stupid: