can a piston go through the hood
11-26-2010, 08:17 AM
#1
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can a piston go through the hood
I know its a stupid question but just out of curiosity can a piston really blow through the hood of a car if the engine blows up?
11-26-2010, 10:18 AM
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The definitive answer: While that is not probable because there are alot of parts and a whole darn plate of metal called a head in front of the piston, anything is possible. Right after the piston goes through the hood, look for giant crack opening up in the earth where Godzilla comes out to hand you a 6 piece McNugget and a new vacuum cleaner.
11-26-2010, 01:37 PM
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11-26-2010, 02:12 PM
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Pics or it didn't happen
Pics or it didn't happen
In order for the PISTON to go through the HOOD it has to:
A. Have enough force to punch through the head cap, the valves, the Cam and the Valve Cover
B. Punch through the Cylinder wall sideways, through the engine block and then bounce upwards
C. Punch through the crankshaft, hit the ground and then find a way back up through the engine bay
The conditions for the piston to come loose are:
A. The connector rod breaks
B. The crank shaft breaks
C. the connector joint breaks
The forces working against having enough upward force on the piston are:
A. The force is generated on the piston downward, not upward
B. The force generated is what will cause the breakage
C. A broken rod will likely crush the piston, wedging it into the water jacket
D. A broken or bent crankshaft will render the pistons useless and bind the engine
E. A broken connector would jamp the piston in the same way as the rod
F. The block in a Hyundai is not aluminum, it is some kind of iron/steel, same with the head.
Things that COULD go through the hood:
A. clutch parts rotating at 2000 RPM and a spline breaks off
B. A hydraulic lash adjuster if the cam bolts broke
C. The cam if the cam bolts were loose
D. A cam bolt
E. The Cam chain on DOHC models
F. Any of the Pullies
G. A piece of engine block which was hit with enough force from inside to break off.
So... Pix or it didn't happen.
Pics or it didn't happen
In order for the PISTON to go through the HOOD it has to:
A. Have enough force to punch through the head cap, the valves, the Cam and the Valve Cover
B. Punch through the Cylinder wall sideways, through the engine block and then bounce upwards
C. Punch through the crankshaft, hit the ground and then find a way back up through the engine bay
The conditions for the piston to come loose are:
A. The connector rod breaks
B. The crank shaft breaks
C. the connector joint breaks
The forces working against having enough upward force on the piston are:
A. The force is generated on the piston downward, not upward
B. The force generated is what will cause the breakage
C. A broken rod will likely crush the piston, wedging it into the water jacket
D. A broken or bent crankshaft will render the pistons useless and bind the engine
E. A broken connector would jamp the piston in the same way as the rod
F. The block in a Hyundai is not aluminum, it is some kind of iron/steel, same with the head.
Things that COULD go through the hood:
A. clutch parts rotating at 2000 RPM and a spline breaks off
B. A hydraulic lash adjuster if the cam bolts broke
C. The cam if the cam bolts were loose
D. A cam bolt
E. The Cam chain on DOHC models
F. Any of the Pullies
G. A piece of engine block which was hit with enough force from inside to break off.
So... Pix or it didn't happen.
11-26-2010, 03:24 PM
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heres the other option for ya
ford 302
the roller cam engines tend to split in half ~500hp
engine splits, sh*t goes haywire, piston comes down and out
its possible i guess
ford 302
the roller cam engines tend to split in half ~500hp
engine splits, sh*t goes haywire, piston comes down and out
its possible i guess
11-26-2010, 03:35 PM
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^^ seen that before, was AMAZED the first time i saw it. Seen it on chevy 305 and 350. Same block though so it doesn't really matter
Flat-tappet FTW!
11-26-2010, 05:55 PM
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Ah, I knew someone would eventually find the pic of the block I karate chopped in half with my penis.
JK On a serious note however, DTN is dead right. It's more likely that the piston and rod(s) will come out the side of the block than through the head. The rod tends to act as a flail when the end cap fails or the thing breaks in half, and there have been some cases where it drags the piston out the side of the block with it. It is more common for it to come out the sump with a crank journal than it is for it to fly straight up. In any case, if you run big boost(and by big I mean 40-60psi) and hear a big bang followed by the hood being punched up, chances are far greater that you have experienced either head stud failure, or the studs have ripped from the block(more common in alloy blocks than iron)