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Re: Another picture
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Posted by buickanddeere on August 22, 2004 at 20:54:46 from (64.10.41.200):
In Reply to: Another picture posted by Jonathan on August 22, 2004 at 20:03:35:
Kind of looks like the top deck split off the block with the head still bolted to it with the sleeves which were pulled up from the blocks main webs.
Unlike a spark ignition engine where pinging/knock/detonation will double, triple or more combustion chambers above normal pressures.
A diesel by definition is detonating when ever it"s running.
There would have been stress from heat, heating cooling cycles, vibration and just plain pressure.
If you figure 90psi boost (6 atmospheres) and 14 to 1 compression. The combustion chamber pressure must be in excess of 2500psi trying to push that head off on just one cylinder alone. On a 5" bore that would be 24+ tons of lift on just one cylinder.
Now imagine the thrust after the fuel is injected and pressure really begines to rise during combustion?
On some race car engines the head does not bolt to the top deck of the engine block. Instead the studs are long and reach down into the main webs. And clamp the whole engine together from top to bottom.
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