Blackbird Rush
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| posted on 31/1/11 at 09:58 PM |
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Fitting an external pully to a bike engine.
Planning my next year winter mods, one being a supercharger 
On a bike engine this means an external pully to drive the blower, has anyone on here done this? i have had a look at the engine and the obvious place
is to extend the crank at the front where the timing rotor is bolted to the crank behind the timing cover as there is no room at the other end of the
engine.
Thinking at the mo of oil seal fitted into the timing cover and an additional bearing to support the extension (if needed?)
There is a circular 'access hole' in the timing cover that would be perfect to house an oil seal.
Just wondered if anyone else has tackled this before in a similar fashion?
Ash
[Edited on 31/1/11 by Blackbird Rush]
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BenB
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| posted on 31/1/11 at 10:02 PM |
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I'm planning on doing this on my ST1100 at some point by using the front crank pulley. I wasn't going to bother with an oil seal cos the
crank pulley sits inside the timing cover  simples!
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tony-devon
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| posted on 31/1/11 at 10:23 PM |
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isnt it dry inside the timing cover anyway, very much doubt that its an oil filled section, although having a seal would be good to keep it clean and
dry in there
I would maybe look at an extention to the crank as you say, with a rubber sealed bearing in the modified cover to give a seal to the timing sensors
etc but also some support to the pulley, and me being me I would probably go for an outrigger support as well, just a chance to make things really LOL
heavy is good, heavy is reliable, and if it breaks, hit them with it
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daviep
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| posted on 31/1/11 at 11:06 PM |
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quote:
Originally posted by tony-devon
isnt it dry inside the timing cover anyway, very much doubt that its an oil filled section, although having a seal would be good to keep it clean and
dry in there
Some bike engines the timing case is oil filled but I think the majority are dry.
Davie
“A truly great library contains something in it to offend everyone.”
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lsdweb
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| posted on 1/2/11 at 08:24 AM |
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I ran an external crank trigger wheel on my earlier R1 - there's a photo of it here -
I ran an oil seal even though it was pretty dry inside the cover.
The one problem I had was keeping it on! Once it sheared the fitting we'd made into the end of the crank (at 11000rpm according to the data!)
and took the timing chain out resulting in 20 very bent valves!
In the end I opted for a custom trigger wheel to replace the original - 
Wyn
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matt_gsxr
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| posted on 1/2/11 at 08:54 AM |
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quote:
Originally posted by tony-devon
isnt it dry inside the timing cover anyway, very much doubt that its an oil filled section, although having a seal would be good to keep it clean and
dry in there
If you've ever tried to set the timing on a GSXR1100 you would not be saying this. I had to make a timing cover with a window in it (after I
had sprayed oil everywhere).
For drysumps folk take drive off the oil pump. Not sure it is man enough for a blower.
The crank is stronger, this little video probably tells you what you need to know.
http://www.youtube.com/watch?v=PEMPprjbCD0
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minitici
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| posted on 1/2/11 at 08:54 AM |
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Hi Wyn,
What type/make/model of clutch slave did you use on your R1?
Doug.
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lsdweb
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| posted on 1/2/11 at 08:56 AM |
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Doug
I think it may have been Metro - it was one that was lying around in my mate's workshop at the time! It worked fine!
Wyn
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minitici
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| posted on 1/2/11 at 08:59 AM |
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quote:
Originally posted by lsdweb
Doug
I think it may have been Metro - it was one that was lying around in my mate's workshop at the time! It worked fine!
Wyn
Cheers Wyn.
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peter bland
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| posted on 1/2/11 at 09:38 AM |
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hi,im wanting to supercharge my gsxr indy. At present i have a external pully which is a Rotrex type which bolts to the crank through a inspection
cover with oil seal. Im going to use a mini supercharger , thats when i find the time. What charger are you going to use?
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tony-devon
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| posted on 1/2/11 at 09:45 AM |
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I honestly never encountered a bike engine where the rotor and pickups were running in oil
but then I mainly work with older bikes so I guess its a new engine thing?
learn something new everyday
heavy is good, heavy is reliable, and if it breaks, hit them with it
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peter bland
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| posted on 1/2/11 at 09:46 AM |
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hi,im wanting to supercharge my gsxr indy. At present i have a external pully which is a Rotrex type which bolts to the crank through a inspection
cover with oil seal. Im going to use a mini supercharger , thats when i find the time. What charger are you going to use?
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Richard Quinn
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| posted on 1/2/11 at 11:30 AM |
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Rotrex blowers have been used on the Aprilia RSV Mille. In fact, someone was looking to do a kit but I'm not sure whether it took off or not due
to the bit of machining required. Anyway, there's a build thread HERE
which may give some food for thought.
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coyoteboy
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| posted on 1/2/11 at 03:05 PM |
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Wow, will a bike engine even turn a supercharger ?
Only kidding, but a mini super has quite a power requirement IIRC, think I'd want a clutched pulley for it with a bike engine at idle.
What boost are you looking at running and have you changed the pistons for low comp ones? Been looking at loads of bike engines with the thought of
super/turbocharging but most at 10.5 or 11:1 ratio, so basically a grenade.
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