Rebuild an SO as an HO?

[HoleshotHolset]

Was the rest of the beefy and very well proven reciprocating assembly in the 6BT/ISB changed at all with the introduction of the ISBe?



Matt

 

[rbattelle]

Connecting rods and crankshaft are unchanged. Block has been significantly stiffened over the older ISB. Pistons on the HO are different, with additional cooling passages.



Keeping your pistons cool will definetly increase their lifespan.

 

[BigDaddyMC]

The need for cooling the pistons has nothing to do with emissions standards and everything to do with longevity. Detroit Diesel produced the old GM 6. 5 turbo diesel and began it's life as a non-oil squirt power plant. Over the years the 6. 5 encountered MANY problems.



Cylinder Temps rose significantly and uncontrollably.



Webbing in the block (mains) were cracking exessively.



Water Temps would rise and where uncontrollable.



What was the fix? There was no real fix as the configuration never really proved to be a work horse in the industry. If you recall, the H1's had the 6. 5 and to this day still have problems. What DD did do was change the blocks several times, drop the dynamic compression ratio, and introduced piston oil injection.



I think that most would agree that EGT's are our biggest enemy. The oil squirting helps to cool a piston that is being bombarded with SICK HEAT! The squirters simply help to counteract the process and save us from a melt down. This doesn't help to cool cylinder temps, this simply aids the piston when trying to fight additional thermal loads. Also remember that there is a little thing called a piston pin that sees addition heat from the more powerful explosion. This more intense explosion adds to more stress on the parts. The squirt actually covers the piston, rod end and pin.



Incidently, the 6. 5 motor had an original Compression ration of 22:1. No squirt, and a very small radiator.



Don't ask me how I know

 

[HoleshotHolset]

Nozzles VS. Galleries....you decide.

We're all about overkill - but the tried and true nozzles have worked fine for over 20 years. As it is... . we worry about clogging up the nozzles with crud from oil changes..... what happens when we clog up the galleries inside the pistons?



News at 11... .



Seriously... Was there ever a problem with people wiping out pistons in the 6BT/ISB series engines?



Matt