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Bugatti Type 45, U-16. Two banks of eight cylinders, two crankshafts and twin superchargers.

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QUOTE …..
Those are Edlebrock 24 Stud Dual Plug heads on the 48-53 flattie block . it uses a modified GM distributor with split wires coming from the towers. Early builders used the 16 tower twin plug Nash V8 distributor body and cap adapted to the Ford base . The SU' carbs are a much later (1970-75) design that incorporate the good parts of the earlier HS style with a clever temperature compensating device that raises or lowers the main jet around the tapered metering needle to richen or lean as need be. The carbs appear to be either early Volvo or MGB-V8 pieces, sitting on a three Holley 94 (3 bolt flange) intake . 63-73 used smaller bore HS-4 carbs and 73-74 US MGB used 2 bolt flanged HIF-4s. And contrary to popular opinion, the HIF SU's are deadnuts reliable, rarely if ever need any adjustment once set up and the linkage is not nearly as complicated as it looks. They just need a few squirts of oil in the damper chamber to work.

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The idea of a 1.5L V16 seems hilarious by modern racing standards, especially to us in the land of BangShift where 900-cube V8s are prowling drag strips. That being said, in the world of Formula One racing back in the early 1950s engine designers had a choice. They could design a 4.5L naturally aspirated engine or a 1.5L blower motor.
BRM (British Racing Motors) decided to go the 1.5L route with their V16. It sported a comical 1.95-inch bore and 1.9-inch stroke. It was capable of 12,000 rpm and when equipped with a Rolls-Royce two stage centrifugal blower the engine made 600hp. Reportedly that Rolls blower was forcing 82 pounds of boost through the engine!
Interestingly, the engine featured two valves per cylinder. We’re guessing the tiny bore may have been a factor in that. These valves make Buick Nailhead valves look massive! How about 1.25in on the intake and 1.09in on the exhaust?
It’s no wonder why Formula One cars were revered so much back in this era. An engine like this in a custom racing chassis was the space shuttle of the day.

Can someone explain how this works? Where are the turbos routed to, and how do they tie into those individual throttle bodies?

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Quote:

Originally Posted by Hads930 (Post 12301862)

The only thing that makes sense is if the charge pipes converge under the dash to re-emerge out the single pipe in the firewall. I’m guessing the intercooler or plenum is removed for show purposes to highlight the throttle bodies…

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Fuel injected alcohol 1965 Corvair engine.