What would cause a connecting rod bolt to break or loosen and allow rod knock or a ho - D-series.org

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Old 07-21-2007, 03:56 AM   #1 (permalink)
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Default What would cause a connecting rod bolt to break or loosen and allow rod knock or a ho

What would cause a connecting rod bolt to break or loosen and allow rod knock or a hole in the block?
1-Crappy connecting rod bolts?
2-Oil pump causing over heating and bearing failure?
3-no oil in motor?
4-lack of the oil getting to bearing?
5-over torquing them to 25 lbs instead of 15 lbs?
6-It being a honda b or d motor stock with less than 2k on motor?
7-Making mad tight jdm power that lifts the rear wheels on a front wheel drive car?
8-clutch alignment belt?

This motor was bone stock b18 b1 with no mods and under 2k miles on new rebuild that was done correctly over 6 months time to make it painstakingly right.

I dont understand as why a stock motor throws a rod threw the side of a stock motor 140 hp beast? why?

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Old 07-21-2007, 04:08 AM   #2 (permalink)
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Using ones gears to slow down, often called engine braking will cause this type of failure. Engine braking puts peak stress on the lowerend, much more than WOT operation.

Over torque will cause bolt failures, as will under torque.

Loss of oil pressure will cause bearing failure in a fraction of a second. Bearing failure if not attended to quickly results in pounding the rod cap off and sending the rod through the block.

If you look at the parts it can become quite obvious as to what caused the failure.

Keep in mind, reguardless of the engine or its build, a single incorrect downshift can cause this problem.

I've got a pile of blocks with 'windows' installed in the sides of them...
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Old 07-21-2007, 04:12 AM   #3 (permalink)
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Originally Posted by liveforphysics View Post
Using ones gears to slow down, often called engine braking will cause this type of failure. Engine braking puts peak stress on the lowerend, much more than WOT operation.

Over torque will cause bolt failures, as will under torque.

Loss of oil pressure will cause bearing failure in a fraction of a second. Bearing failure if not attended to quickly results in pounding the rod cap off and sending the rod through the block.

If you look at the parts it can become quite obvious as to what caused the failure.

Keep in mind, reguardless of the engine or its build, a single incorrect downshift can cause this problem.

I've got a pile of blocks with 'windows' installed in the sides of them...
how much over torquing?
try to get pics today as i am taking part the motor today
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Old 07-21-2007, 04:14 AM   #4 (permalink)
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Bangin rev limit in down shift (not happened) what i mean is how can a down shift be considered incorrect?
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Old 07-21-2007, 09:10 AM   #5 (permalink)
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lack of oil to the bearing, it get hot, tolerances get tighter, it gets hotter then BOOM!
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Old 07-21-2007, 09:35 AM   #6 (permalink)
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I have always been told that engine braking is bad... Down shifting at redline aint cool... Thats why they make $20.00 brake pads....
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Old 07-22-2007, 02:03 AM   #7 (permalink)
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Slowing with gears makes massive amounts of engine bearing heat. The oil wedge is punished in both cycles when ever your throttle is closed and the engine is at high RPMs. Normally, the compression stroke helps to cushion the peak bearing stress point, which is of course stopping and re-starting the piston at TDC. Combustion force is hardly compairable. This is why rod bolts are so crucial in engines that spin.
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