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11-18-2013, 05:15 AM
#1
Senior Member
RACING JUNKIE
Thread Starter
Join Date: Mar 2008
Location: Emmett, Idaho
Posts: 7,334
11-19-2013, 05:36 AM
#3
Senior Member
RACING JUNKIE
Join Date: Jan 2012
Posts: 628
Heh, heh, lots of sympathy from the comments crowd below the article . .
On the Post Mortem, I dunno where you'd start. Kind of a chicken or egg deal. Usually, at that RPM it's a valve that is the fuse to all the rest of the destruction. Especially with a blower on that big of a motor . . But if it didn't lift the blower, then it was probably bearing failure. A rod won't break (usually) unless the bearing below it seizes up, so there you go, was it the oil or lack of oil that caused the BIG BANG (theory)?
In all my years of messing with blown Alky cars and Engines, as I've said in other threads, the valve train is usually the first to go, which in turn, if things go like they usually do, leads to a catastrophic bearing failure, simply because when you slow down or stop one piston out of eight, sh*t happens . . Fast!
Another thing to note, is the common problem with Aluminum Rods. They are designed for strictly Tension and Compression. Little or no shear. And when there's any shear moment on most Aluminum Rods they become three piecers in a hurry!
But there's about two dozen other reasons why the BBF went bang, starting with the basic one, "It's a Ford!" . . . . . More sympathy . . .
On the Post Mortem, I dunno where you'd start. Kind of a chicken or egg deal. Usually, at that RPM it's a valve that is the fuse to all the rest of the destruction. Especially with a blower on that big of a motor . . But if it didn't lift the blower, then it was probably bearing failure. A rod won't break (usually) unless the bearing below it seizes up, so there you go, was it the oil or lack of oil that caused the BIG BANG (theory)?
In all my years of messing with blown Alky cars and Engines, as I've said in other threads, the valve train is usually the first to go, which in turn, if things go like they usually do, leads to a catastrophic bearing failure, simply because when you slow down or stop one piston out of eight, sh*t happens . . Fast!
Another thing to note, is the common problem with Aluminum Rods. They are designed for strictly Tension and Compression. Little or no shear. And when there's any shear moment on most Aluminum Rods they become three piecers in a hurry!
But there's about two dozen other reasons why the BBF went bang, starting with the basic one, "It's a Ford!" . . . . . More sympathy . . .
ops:
