One turbo per cylinder
One turbo per cylinder
(OP)
C'mon guys, tell me I've stumbled on something pretty new!
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Pros and cons?
Dunno myself having only taken the pic today and not had time to think about it, but I wonder what the spool up time would be like? If one turbo relies on multiple hits of the gas pulses from the various cylinders hitting it to spin it up (hamster on a wheel) then each one is going to spin up slower perhaps (hamster with 3 broken legs)? But then, you have got four of them to offset that effect perhaps....
Thoughts anyone, good bad or otherwise?
ht
Pros and cons?
Dunno myself having only taken the pic today and not had time to think about it, but I wonder what the spool up time would be like? If one turbo relies on multiple hits of the gas pulses from the various cylinders hitting it to spin it up (hamster on a wheel) then each one is going to spin up slower perhaps (hamster with 3 broken legs)? But then, you have got four of them to offset that effect perhaps....
Thoughts anyone, good bad or otherwise?





RE: One turbo per cylinder
Here is my quick list:
Cons
- spool-up
- underhood heat
- packaging
- sound (unless you like 4x the whine)
Pro
- short inlet/outlet runs
ISZ
RE: One turbo per cylinder
I like the turbo to head exhaust volume and surface area
Regards
Pat
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RE: One turbo per cylinder
Rod
RE: One turbo per cylinder
rmw
RE: One turbo per cylinder
- Steve
RE: One turbo per cylinder
RE: One turbo per cylinder
720degCrank is way too long a delay between each blowdown event.
MS
RE: One turbo per cylinder
I wouldn't expect a turbine designed for quasi-steady flow to operate with any kind of efficiency or design margin under these conditions. Solution: put a plenum between the exhaust port and the turbine?
RE: One turbo per cylinder
I'd expect the turbos to die young from fatigue due to the unsteady flow.
A while back I worked on a big go-fast boat that was going to have nine turbos per engine. They were staged; three running at low pressure, six running at high pressure. I think the engine had 18 cylinders, but I'm a little fuzzy on that. I was only working with the exhaust plumbing after the low- pressure turbos. It would have looked nice with three shiny 24" diameter zoom stacks on each side, but they wanted it quiet, too, which meant mufflers (no space for them in a go-fast boat) and an underwater exhaust system (with a 32" i.d. seacock). It would have been fun, but the engines went out of production before they finished the plans.
Mike Halloran
Pembroke Pines, FL, USA
RE: One turbo per cylinder
waste gate valve:BEP turbine on 90% of full load, beyond that the bypass over turbo opens
turbo's of different diametre in cascade (with bypass valves over them. this to cover the full load range of the engine.
further, at the exhaust you have two main systems:
-constant pressure system:exhaust gasses are collected and allowed to expand in the big diametre collector prior to entering the turbine
-pulse pressure system:exhaust gasses are individually piped to the turbine in such a way they hit the turbo in a synchronised manner (spaghetti outlet)or like in example one turbo /cylinder.it will give peak performance on one point of load curve of the engine(for which the exhaust pipe/nozzle is designed)