Originally Posted by MADDOG
My concerns are that the HEMI's aren't built specifically for forced induction and boost pressures. Eventually, they suffer some sort of ring, ring land or piston failure.
So let's talk about another question...
What does RIPP recommend with respects to building the HEMI to reliably handle "BLAST" and still run reliably over the long term?
We disagree - not totally but we do disagree, We've had our 2010 appart and we've built supercharged several SRT's
Most failures are associated with the roots type blowers, because it smashes the engine with boost right off idle and the pistons suffer. Positive displacement blowers will do that.. its fun to come out of the hole like a banshee - but the stock engine will always suffer. The lack of a proper centrifugal supercharger kit in the truck market really does bring this question to light. We knew going in it was going to be a bit of an uphill topic...
Centrifugal superchargers are a bit "lazier" with respect to delivering boost, they deliver boost based on the engines volumetric efficiency. So the more air the engine can move, the easier it is to deliver boost. Thats not to say its not "fun" its still strong, but it actually delivers less boost to get the job done because it delivers lots of volume as well. But its efficiency shows throughout the entire RPM band... it only takes 7-11 crank HP to deliver 100+ wheel hp... plus because its so big the boosted air does not get to hot (like a roots). Lastly is extremely predictable, meaning it will always deliver the boost at the same rate at the same RPM... unlike turbo or root (where the hotter they get the more they spike).
So while we know there have been horror stories out there with respect to boosted HEMI's our research shows it based mostly on positive displacement blowers. Secondly we are OEM tuners for Diablo, so our calibrations are very strong, we pay particular attention to knock counts are air fuel. Its very easy to cheat the engine out of safety. For example we won't name kits but, many provided calibrations shut the knock and rear O2 sensors off... that will more likely cause a tuning issue and ultimately engine failure.
WE DO NOT do that- we are use to Jeep guys who drive 2000 miles from home to for 100 miles into the middle of nowhere... that a very big responsibility. 99% of our clients run the provided RIPP tune right out of the tool...
But to answer your question - if your worried about the pistons... swap in a forged set or build a block on the side with components designed for boost. Your stock block will retain value as a core and you can sell it off.
Questions always welcome,