Took her to the track yesterday and on the second pass she let go, no warning just a bang. I don't know if the rod was what let go or the piston. One of the rod bolts is broken, maybe this is what caused it? Hopefully the engine in my parts car is in decent shape, it only has 33000 miles but its locked up, probably do to rust from sitting. Photobucket will not let me post the pics directly, here's a link. http://s1271.beta.photobucket.com/user/Maverickdan73/media/broke%20it/IMAG0218.jpg.html?sort=3&o=0
With the rod still on the journal it wasn't a rod bolt failure, that's aftermath... Likely the rod broke, and the rest is collateral damage... I say this because seldom does a piston pin boss suddenly break, usually they'll crack and make noise before they let go...
It was an embarrassing 12.8@92 it was breaking up some so I aborted the run. I'm starting to think it may have been bad gas cause I filled it up on the way to the track and it never did this before. I also filled my truck up there at the same time with the same fuel and when I was leaving it did not want to start, maybe just a really unlucky coincidence?
Yeah, since Photobucket has upgraded, I have had some issues too! Make sure you're logged in. It now automatically logs you out after a period of time. I wish you would have a choice of layout when a site changes the format! I had no problem with the " old " way!!!
Got the engine out today, and pulled one head off and found 2 windows into the water jacket. My cylinder head got messed up, I'm pretty sure it can be repaired. Hopefully it wont cost too must. [/IMG][/IMG][/IMG]
Wow. So... who can CSI the chain of events for me? I'm guessing hole in cylinder first, then liquid lock, then shattered the connecting rod. What was that engine bored to, Dan?
Nope, cylinder wall breakage is after the fact, I stated in my first post it was broken rod, but on closer examination was probably the wrist pin or maybe piston boss... The holes were no doubt caused by a complete rod, loose from the piston flailing around(then it broke), so I've changed my opinion...
From what I can see and the vid.. you found the pistons limit.. and it took the rest of the motor with it. most folks don't realize how high the dynamic compression ratios can go for stock cammed motors and blowers add a whole different level of stress to the equation. Not to mention that if spark or fuel gets out of whack for even a shorter time on a boosted motor.. those heat spikes can kill parts(especially pistons) faster than you can let off the gas sometimes. And staying on the gas usually takes out the whole shebang as you apparently did here. If you want durability..AND power.. it'll usually take more than used motors or junkyard parts to do it. Although, on rare ocassion I have seen some exceptions to that rule. Generally, the ones that do last are properly prepared and/or built specifically for boost with decent slugs. Are you planning on another stock style shortblock.. or stepping up to a dedicated huffer build?
What boost, compression and gas are you running? And btw 12.8 is still fast lol though a sec off almost from sig
