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Post by wayne on Aug 25, 2021 19:10:28 GMT -5
Terry, given that Sam says a test motor was mounted in a modified RE5 frame, I would guess that the orientation would have been very similar.
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Post by Framitron on Dec 17, 2021 19:38:32 GMT -5
If Suzuki intended the stock large radiator and oil cooler to cool the twin rotor does that mean that the stock water and oil pumps are also sized for the twin? Ditto for the primary chain?
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Post by wayne on Dec 17, 2021 20:30:43 GMT -5
I've heard this regarding the radiator as well. From Sam himself I believe. But I do wonder about it. As we all know, the bikes can get pretty hot in stop start traffic with the single rotor.
As for the primary chain, I'd hope not. The people I know with the most experience stripping and repairing these bikes have all commmented adversely on the (lack of) quality of the primary chain. It doesn't cope well with the single rotor.
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Post by Framitron on Dec 18, 2021 16:09:22 GMT -5
I wonder the same thing about the radiator especially when sitting in traffic baking like a potato. But looking at the newest Creighton CR700W machine with 3.5 times the power of the RE5, it has radiator that, at least with respect to frontal area, is not much larger than the RE5 radiator. So perhaps at speed (highway for the twin rotor RE-10) the high flow rate of air through the existing radiator might be sufficient for cooling. (Yes the CR700W is forcibly cooling its rotor through its venturi exhaust extractor so it is adding an unknown amount to its cooling)
Yes, the RE5's weak primary chain does not seem up to the task of twin-rotor duty. That chain is a bit perplexing to me considering how much effort Suzuki invested in making the RE5 a durable high-speed touring machine. My first thought was that Suzukui should have used a Hy-Vo type silent chain because that type of chain even in the 70's was able to deliver plenty of power. All the Hy-Vo chains need are some dedicated oil spray to keep them lubricated under load (look at the Honda CB 750, 900 and 1100 primary chain systems). Possibly since Suzuki was in a rush they just tossed on the first roller chain they could find for development with the intention of replacing it later. But since they went with a specially made roller chain it's unclear what their thinking was considering it ended up being a consumable component like a final drive chain.
As for the water and oil pump capacity for twin rotor I guess that can be determined experimentally or by talking to a mechanic who has worked on many different sized engines and has an intuitive idea what size pump is needed for a twin-rotor. Might be something similar to the size for a big bike like a VMAX or Valkrie...
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Post by wayne on Dec 18, 2021 19:55:15 GMT -5
In other posts I've noted how my RE5 runs considerably cooler at a constant 90 mph vs 60 mph. You're right, radiator is more than adequate at speed. But there's that mid summer Friday afternoon city commute............
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Post by wayne on Oct 31, 2022 0:40:26 GMT -5
Buried in some notes I've been collecting for more than 20 years was this by Sam Costanzo:
"...........including 10 painted "ensembles" that were in storage. My notes and records indicate at that time Suzuki R&D rescued 10 prototypes plus ensembles off the loading docks. And my quiet sources at Suzuki state they still have them tucked away in storage. One is the RT-10 twin rotor #10050 in two-tone Firemist Blue. Another is RT-10 twin rotor #10051 in two-tone burgundy with shaft drive and "Road Cruiser" touring package..... However, Suzuki's official factory line is quoted as saying "We don't have any...maybe."
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