Project XXX AWD WHP Or Bust!

[s1ngletracker]

Hey dude, are you still running the dual walbro setup? Do you have an aftermarket FPR? What is your fuel pressure at? You might be overrunning the mother loving crap out of your stock regulator, washing your cylinders and diluting your oil. I didn't see an FPR on your mod list.

Bearings don't really like a broken-down oil/gas slurry...

[blackawdtsi]

It's kinda hard to figure out what happened without actually seeing it.

From the pictures, it looks like a rod nut wasn't properly tightened. Which caused the nut to loosen then shear off the bolt and as the piston was pushed down, bent the rod and turned the piston. If the piston was suspended for 14 or so degrees at TDC just after the bolt sheared because of the play from having only one rod bolt, that would explain the bent valves.

singletracker, maybe you know something I don't. But wouldn't an overrun FPR just not be able to control FP and dump too little pressure and raise the fuel pressure at idle / low boost. How would it get into the oil?

[Alpha D]

Interesting you mention the dual fuel pumps. . .i was wondering wether i thined the oil out with the car running WAY rich. . .I bought 110 race fuel for a couple reason's A to kind of clean my valves cylinders ect, B to help prevent detonation since ignition timing needed to be taken care of and i knew i might have to drive it a distance to get tuned primarily to prevent any kind of knock. Now i had 15w 40 rottela instead of 5w 40 which dosnt make all the difference in hot wether . . .temperatures were at 70 plus degress at all times.

I must make a correction only 1 of the valves are bend. Once i removed the cam shafts all the valves sealed against the valve seats. Granted i wouldnt know for sure unless i leak down tested which at this point is futile. Judging from the damage on cylinder number 1 the other valves didnt touch the pistons.

I kind of am leaning towards blackawdtsi scenerio because the darn rod stud that pulls the nut on to the cap completly seperated. . .how that even works im clueless. We have MAJOR DESTRUCTION. . .over all i think my first guess of a loose rod must have been correct. . .:(

[Alpha D]

Singletrack, Yeah i still have dual fuel pumps in tank. . . i will definetly add a fpr to my modlist or before the next engine is assembled and goes back in car.

[93gtpeater]

That motor was beat before you got on it. iam not suprised it blew up. Its a bummer but just keep at it. and tgis is what happens when you buy used parts shit can go break pretty fast sometimes.

[blackawdtsi]

That motor was beat before you got on it. iam not suprised it blew up. Its a bummer but just keep at it. and tgis is what happens when you buy any parts shit can go break pretty fast sometimes.

It sucks you had to learn the hard way. But unless you trust who it came from and they said it was without a doubt spectacular, clearance and torque everything important. I had to recently relearn that lesson also.

[Alpha D]

Thank you guys, especially for the words of encouragment :) regarding the trust part yeah it was from a very trusted source. They actually were there with me when it happen'd I hope to recieve some pointers, guidance ect during the next engine build from him. Heck with a little bit more posting and asking you guys, if i dont understand something the next season should be fun. Just gotta come up with a game plan now. I have my old engine sitting on the bench. Stripped down . . .the crank, water pump, oil pump, timing components and main bearings are the only thing left attached.

[s1ngletracker]

It's kinda hard to figure out what happened without actually seeing it.

From the pictures, it looks like a rod nut wasn't properly tightened. Which caused the nut to loosen then shear off the bolt and as the piston was pushed down, bent the rod and turned the piston. If the piston was suspended for 14 or so degrees at TDC just after the bolt sheared because of the play from having only one rod bolt, that would explain the bent valves.

singletracker, maybe you know something I don't. But wouldn't an overrun FPR just not be able to control FP and dump too little pressure and raise the fuel pressure at idle / low boost. How would it get into the oil?

Yeah, i didn't actually look that closely at his failed motor pictures - it does look like a stud failure or some such thing. I was reading earlier in the thread and was like WHOA! twin pumps... dont' see anything about upgraded fuel regulation.

So when you run too rich, you can actually run so rich that you have just a ton of unburned fuel that slips past your rings and drains down into your oil pan. I've unfortunately experienced such a thing, my oil level rose and it smelled like gas. Needless to say I did like 3 oil changes in quick succession to get that crap outta there.

[Alpha D]

Perfect advice for the next rodeo get a FPR!... I wondered wether i would over run my stock fpr as well, once i started driving the car ect, but figured the pump probably wont crank that much pressure out . . .(Now that i think about it though with two pumps....didnt i technically dumple the pressure?) I Didnt give it to much thought as far as idle goes. I guess that stud might of been on its way out and something pushed it off the edge. Sad well never know what excactly did it. . .

[Halon]

Whoa you were running dual pumps on the stock FPR? A single 255 is borderline over running the stock FPR at idle. I can't imagine how much you were over running it with a dual pump setup.