Jump to content
SAU Community

Recommended Posts

Had a close up look at some Wright Cyclone R3350 aero engines yesterday. Those guys had some ideas.

3-turbines but not coupled to compressors as in our conventional turbos.

They're geared back to the crank, so they use the exhaust gas to directly develop crankshaft power.

The story mentioned they add around another 500hp in the big power configuration.(around 3500hp)

Link to comment
https://www.sau.com.au/forums/topic/343225-exhaust-recovery-turbines/
Share on other sites

Wow never heard of these

Following the war, in order to better serve the civilian market, the Turbo-Compound[2] system was developed in order to deliver better fuel efficiency and thus economy ("gas mileage"). In these versions of the engine, three power recovery turbines (PRT) were inserted into the exhaust piping of each group of six cylinders and geared to the engine crankshaft by fluid couplings in order to deliver more power (rather than by using the exhaust to deliver additional boost as in a turbocharger). The PRTs recovered about 20 percent of the exhaust energy (around 500 HP) that would have otherwise been wasted, but unfortunately had a negative effect on engine reliability, causing many aircraft mechanics of the day to nickname them "Parts Recovery Turbines" (and worse). The failures concerned would probably have been of exhaust valves and related parts since the turbines would have both increased backpressure & increased the operating temperature of the exhaust valves causing greater wear and failure.[citation needed]

Straight from wiki :D

from back in the days of the napier nomad . google that

john deer actually had an engine that had a turbo exhaust wheel drivinv an electric generator that powered the crank . total effiency was about 47% which is pretty good

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Stock equivalent turbo replacement is a bit of a nightmare. The old Hitachi ceramic things were pretty good for their time, but they have primitive, vintage aerodynamics. The only thing they have going for them is a light turbine**, and there are plenty of other light turbine options these days, in both materials and CNC manufacturing methods. So, the old stocker makes absolutely no power at all compared to its physical size and its (not very low) boost threshold and response. ** and the ONLY thing that was good about the ceramic turbine was that it was light. In all other respects it is a nightmare. To get a turbo that is anywhere near equivalent in terms of power capacity (ie, to avoid it being "bigger" and needing tuning/fuelling/etc) you have to physically downsize. And that is not a "stockish" replacement. Doesn't just fit where the old one did. At least a frame size down, probably need a new dump, probably need new inlet and outlet piping made on the compressor side, new hose connections as D said above. I say, if you have to suffer that much work, you might as well do the same work to fit an even bigger (than stock) turbo, have more power (and hence have to do injectors, ECU, etc), and love life, instead of suffering with stock power levels. Or, you get a light highflow from someone like Hypergear. A highflow that has not been pushed too far from stock. There are still modification consequences here though. HG's cores are smaller than the massive Hitachi core, so it is shorter, moves the compressor housing backwards and requires mods to the air side piping. Plus new hoses. Looks stock, mostly fits where the stock one did (with the previous caveats mentioned), makes a bit more power but can be run at stock boost levels and not cause too many ECU problems. But, seriously. It's 2024. Like - 25 years since the R33 came out. It's time to put an ECU in it. I Nistuned my car (on RB20 ECU then later again on the Neo ECU) and it was the single best thing possible for minimal money. Dial out the R&R bullshit, fix up the fuelling and timing to make it more efficient for normal driving (cut fuel consumption by >10%). Nistune is not an option for you unless you change the ECU, so you might as well just do a standalone. it will be worth it. And then you can tune it up to the limits of the injectors and AFM, which is pushing 200rwkW and enjoy some actual squirt, instead of the lazy barge-like motion you get from a stock engine, turbo and management.
    • He can't post pics until he's at 10 post count.
    • Welcome James.....will be interesting to see how much fun there is in the project. .....where's the pics?
    • Your profile doesn't say where you are, but you can get your current turbo rebuilt by any competent turbo shop, places like Precision Turbos or GCG They can replace the core with a modern ball bearing unit and should be able to source same or slightly larger wheels to fit in you housing. Note if you change the core you may need new oil and water lines too
×
×
  • Create New...