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]

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!

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

quote:

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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

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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

quote:

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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

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Hi Wyn,
What type/make/model of clutch slave did you use on your R1?

Doug.

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

quote:

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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

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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?

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

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?

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.

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.