nstrug
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| posted on 26/3/08 at 08:40 PM |
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R1 5PW + Rotrex = worth it?
Does anyone know if someone has used a Rotrex on an R1 5PW? I'm toying with the idea but I'm not really sure how to proceed.
My main issue is how to get drive off the end of the crankshaft. The timing cover end of the crankshaft has a nice M10 thread in it that is used by a
bolt to retain the pickup coil (60Nm according to the workshop manual so probably 10.9 though the bolt is unmarked)
Would this be suitable for fitting a shaft to drive the pulley?
The timing cover has a threaded plug which provides access to the crankshaft end. The timing cover itself is cast ally and looks reasonably strong.
Would it be enough to thread a roller bearing and fit it into the plug hole, or do people usually fabricate a bracket so that the drive pulley is
supported on both sides?
I've never seen any supercharged bikes up close so I'm really interested to know how people get the drive out for the charger.
Cheers,
Nick
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nstrug
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| posted on 26/3/08 at 08:41 PM |
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quote:
Originally posted by nstrug
The timing cover end of the crankshaft has a nice M10 thread in it that is used by a bolt to retain the pickup coil
Of course I meant pickup rotor...
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hobbsy
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| posted on 26/3/08 at 10:05 PM |
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Interested in what you find out but I've been slightly biased towards turbocharger conversions as they seem to spool well and its cheaper to get
a new Mitsi turbo thats suitable than a Rotrex.
Plus it arguably easier to make a turbo manifold sometimes than fab a reliable supercharger drive.
Plus the amount of horsepower it takes to spin the charger.
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nstrug
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| posted on 26/3/08 at 10:33 PM |
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quote:
Originally posted by hobbsy
Interested in what you find out but I've been slightly biased towards turbocharger conversions as they seem to spool well and its cheaper to get
a new Mitsi turbo thats suitable than a Rotrex.
Plus it arguably easier to make a turbo manifold sometimes than fab a reliable supercharger drive.
Plus the amount of horsepower it takes to spin the charger.
I know all the above but just wanted to do something a bit different - and I like my sidepipes 
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hobbsy
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| posted on 26/3/08 at 10:37 PM |
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Hey you can still keep the side pipes with a turbo, you just need to mod them a bit 
Plus the rotrex is just like a turbo on the compressor side so kinda acts similar ish to one in terms of spool and boost vs rpm (well kinda...).
Its ain't rootes s/c put it that way. I'm sure you already know this know.
Check out MK (I think) who did a GSXR1000 with a Rotrex... Rizla decals if I remember?
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Daimo_45
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| posted on 26/3/08 at 11:49 PM |
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Must be do able. TTS do a conversion kit.
Linky
[Edited on 26/3/08 by Daimo_45]
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Coose
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| posted on 27/3/08 at 08:29 AM |
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The TTS kit takes the drive off the clutch gear. They cut a hole above the clutch in the crankcase and mount the S/C there. Apparently they work very
well!
After owning a Polo G40 in my youth, I'm afraid it'd be supercharger over turbo for me every time!
Spin 'er off Well...
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Coose
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| posted on 27/3/08 at 08:30 AM |
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Hmmm... Looking at your link it seems that the kit drives off the end of the crank, so it should be even easier to fit! They must have moved away from
the clutch-mounted kit.....
Spin 'er off Well...
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MikeRJ
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| posted on 27/3/08 at 08:40 AM |
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quote:
Originally posted by hobbsy
Plus the amount of horsepower it takes to spin the charger.
It does takes some power to drive a turbo charger as well, many people seem to think it uses purely "waste" energy.
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hobbsy
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| posted on 27/3/08 at 10:37 AM |
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Not a cheap kit either. You could cobble together a turbo kit for under a grand or so. Depends if you have to pay for fabrication or you can do it
yourself.
Plus you can get more than 30% power gain that way Even with a stock bottom end.
And ref G40 Polo - isn't that a positive displacement charger so will drive quite differently to these centrifugal "half a turbo"
Rotrex's?
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nstrug
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| posted on 27/3/08 at 09:34 PM |
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Yes, TTS do a conversion but its very expensive and they only do 04 R1 onwards, presumably because they don't like the CV slides on the 5PW
throttle bodies.
TTS only quote 30% power increase which seems low to me - plenty of people are getting 50-100% power increases, although with a need to drop
compression at the higher levels of boost obviously.
What TTS do (taking drive off the crank) is what I would plan to do, just wondering what actual machining needs doing.
Nick
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Schrodinger
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| posted on 27/3/08 at 09:39 PM |
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there have been some articles in PPC over the last couple of month on using superchargers and where to source them and mount them.
Keith
Aviemore
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