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Those crazy europeans are at it again, they are trying out a Pro Charger on an Allison V-12,
it is still in the design phase from what i understand, here is what he wrote on another forum about it versus a roots type blower,
"You mean roots type blowers?
They are supposed to be!
According to the guys running with the Pro Chargers there is about 300 hp advantage over a blower on a V8 engine.
Our EFI guys had one on a 526 cui Arias Century with AJ heads which delivered 2800 hp at 8500 rpm. I have no idea wether this number is true, but I saw their fuel maps and they for sure put A LOT more fuel into that V8 than we can put into our Allisons at the same A/F ratio right now. So we hope to gain some air!
The other disadvantage of a roots type blower is the pretty small air exit on the modern roots blowers. When put on a large V12 as ours it's quite a task to feed more than 8 cylinders at all.
The biggest disadvantage of a roots type blower being in the same range of performance of the Pro Charger is the price. A Pro Charger will sell for + - 5000 US $, a state of the art Kobelco will probably go for more than 10k.
What would be an advantage of a roots type blower is the low end tourque. The centrifugal chargers need some rpms to move air and build boost.
This characteristic requires a way more complex fuel system (the same is true for turbos) for a centrifugal charger (which is why blow-through carburators are so populat with these chargers).
While a roots type blower more or less delivers the same amount of air per engine revolution (and you can simply feed an fixed amount of fuel per revolution through a positive deplacement gear pump to the engine) the Pro Charger needs a fuel system which is sensitive to boost, adding a third factor - which is like going from a two dimensional graph to 3D.
We have the fully programmable EFIs on our engines so we can program towards perfection in (hopefully) a short period of time.
This all is just a test set up, bolted onto / adapted to the original accessory housing, to collect data and see where this all leads to."
here is a video that i hope works
Hot Damn i love that sound
it is still in the design phase from what i understand, here is what he wrote on another forum about it versus a roots type blower,
"You mean roots type blowers?
They are supposed to be!
According to the guys running with the Pro Chargers there is about 300 hp advantage over a blower on a V8 engine.
Our EFI guys had one on a 526 cui Arias Century with AJ heads which delivered 2800 hp at 8500 rpm. I have no idea wether this number is true, but I saw their fuel maps and they for sure put A LOT more fuel into that V8 than we can put into our Allisons at the same A/F ratio right now. So we hope to gain some air!
The other disadvantage of a roots type blower is the pretty small air exit on the modern roots blowers. When put on a large V12 as ours it's quite a task to feed more than 8 cylinders at all.
The biggest disadvantage of a roots type blower being in the same range of performance of the Pro Charger is the price. A Pro Charger will sell for + - 5000 US $, a state of the art Kobelco will probably go for more than 10k.
What would be an advantage of a roots type blower is the low end tourque. The centrifugal chargers need some rpms to move air and build boost.
This characteristic requires a way more complex fuel system (the same is true for turbos) for a centrifugal charger (which is why blow-through carburators are so populat with these chargers).
While a roots type blower more or less delivers the same amount of air per engine revolution (and you can simply feed an fixed amount of fuel per revolution through a positive deplacement gear pump to the engine) the Pro Charger needs a fuel system which is sensitive to boost, adding a third factor - which is like going from a two dimensional graph to 3D.
We have the fully programmable EFIs on our engines so we can program towards perfection in (hopefully) a short period of time.
This all is just a test set up, bolted onto / adapted to the original accessory housing, to collect data and see where this all leads to."
here is a video that i hope works
Hot Damn i love that sound
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