Forced induction 100cc

[speedpro]

A hose from my mouth to the carb would work a treat then

You'd need an intercooler

[ducatilover]

You'd need an intercooler

And a 38mm wastegate

[husaberg]

A hose from my mouth to the carb would work a treat then

Nitros............................................ ...

http://www.nitrous.info/motorcycle-n...ion-system.htm

[ducatilover]

No thinks, I'm familiar with nitro and can't be fucked unless it's premixed in my tank boost and boost everywhere is where it's at

[jasonu]

And a 38mm wastegate

and a filter to catch the dribble...

[ducatilover]

and a filter to catch the dribble...

More like a bath tub.

Anyway, get back on topic, moar awesome engineering please!

[Sketchy_Racer]

Well as promised here is an easy explanation of the gear box layout.



The input shaft will spin at engine speed (or what ever ratio up to a 1:2 ratio in order to achieve desired boost levels)

Then that shaft transfers through a set of a gears which are there only to reverse drive direction

Then the second shaft drives the outer ring gear (which has no teeth, it is a traction drive gearbox so relys on friction to transfer drive) It is not a fixed drive it has 4 engaging dogs that keep it floating.

The Outer ring the transfers drive to the Planet gear which is 28mm dia which is a 4.44:1 ratio to the outer ring (for each rotation of the outer ring the planet gear spins 4.44 times)

Finally, the center shaft or Sun gear is captured by an arrangement of 6 of the 28mm Planet gears which has a ratio of 2.49:1

This means that the final ratio comes in at 11.06:1 which is great for achieveing 100,000-200,000 RPM for the turbine whilst keeping all the bearing within their designed operating range.


Again when it comes to manufacture, this system is actually far easier to make than the Roots system (if we ignore the compressor housing and turbine stolen from the turbo) but the heat expansion and inertial expansion of the outer ring will be critical as that is what maintain the friction between all the rollers.

[bogan]

Interesting on many points.

The floating ring gear, I'm guessing the 'floating' tolerances have to be very tight anyway to prevent excessive wear?

And here

Finally, the center shaft or Sun gear is captured by an arrangement of 6 of the 28mm Sun gears which has a ratio of 2.49:1

You mean 6 of the 28mm Planet gears right? and these hole the shaft captive so you only need one bearing on the shaft itself to contain end float, or do they do that too?

[Sketchy_Racer]

Interesting on many points.

The floating ring gear, I'm guessing the 'floating' tolerances have to be very tight anyway to prevent excessive wear?

And here



You mean 6 of the 28mm Planet gears right? and these hole the shaft captive so you only need one bearing on the shaft itself to contain end float, or do they do that too?

The floating tolerance are not to great, It is to make sure there is no mechanical binding as the outer ring expands with heat and velocity.

Wear will be expected, and the unit will more than likely only live 4-5 hours operating before an inspection will be required. But ya never know.

And yes, you are right the 6 Planet gears not Sun gears. End float is via a shoulder on the turbine shaft (which is not shown in the video) The shaft is held fully captive via the Planet gears.

[Sketchy_Racer]

Making progress.

I have finished the base plate, bearing posts and the outer ring. I am not totally happy with the fit of the outer ring but I will test this one out and may make a spare one with greater pre-tension.

I have also spent a lot of time researching traction drive fluids which are what make the whole gearbox work efficiently. They are a synthetic hydrocarbon oil with elastohydrodynamic properties. A bit of a mouth full.

The principle behind these fluids is that under extreme pressure they go though an almost instantaneous phase change to create pseudo pads between the contact points enhancing mechanical drive transfer without a great losses.

I have sourced a couple of supplies but this shit aint cheap! Rotrex charge $100 per litre and HKS $350!! I hoping I will managed to find another supplier that isn't a brand so it wont have that extreme mark up. Mobile DTE heavy oil has these attributes but not to the same extent and I have a heap of that at work so I may give it a try, if it doesn't work it wont cost me anything.

Anyway here are some photos of the parts so far, all this is has been manually turned and milled. This gearbox is so simple I don' t need fancy CNC gear at the moment.

[Sketchy_Racer]

Oh so close!

It'll be running tomorrow. I have to machine the shafts and finish the gears off and the last piece will be to put the end float collar on the impeller shaft, that'll be the hard part.

Anyway, I pulled the old Roots blower out of the bike to give a side by side comparison. These photos make the new blower look larger than it is, and the mass will be the same as the old one coming in at 1.6kg.

Who wants to take a bet on how much boost it will make? I recon 20psi will be achievable (but for how long....)

[Ocean1]

Looks good mate. You looking at a similar manifold volume for this one?

[Sketchy_Racer]

Looks good mate. You looking at a similar manifold volume for this one?

Yeah will be using the same plenum as the last one which is just over 1000cc.

[Ocean1]

Yeah will be using the same plenum as the last one which is just over 1000cc.

Look forward to hearing it spool up!

[Kickaha]

I recon 20psi will be achievable (but for how long....)

I think you're aiming low, F1 Turbo era they ran 60lb use that as your benchmark