Forced induction 100cc

[Moooools]

I need to source a supplier of precision gears? Anyone know where to get some?

AH gears. Or BOP gear cutting.

Both are good if you want them custom cut. Need to get them hardened afterwards though.

[speights_bud]

Printing presses use gears, we pay AU$1 per tooth on 1/8CP gearing, other machines use helical gearing , some module (?). If the gears are shit the print is shit.
Seeing as you have traction oil in the supercharger case , why not make the input gears into rollers

Made some tiny gears for the ink pumps once, prick of a job without the specialized tooling for it. But the Boss insisted so i carried on and yea they worked in the end but it wasn't very economical.... Sounds like the aussies have it sorted

AH gears. Or BOP gear cutting.

Both are good if you want them custom cut. Need to get them hardened afterwards though.

Yep BOP Gears are good, there is also a firm in Pram that do gears which i can't remember their name. We used to borrow Gear cutting hobs between the 3 of us for special/oddball pitches etc. A deep Cycle nitriding should do the trick for heat treatment if you want to go steel, or hard anodize some 7075 if heat & expansion etc play nice.

[Moooools]

or hard anodize some 7075 if heat & expansion etc play nice.

Hell yes 7 series. I know where a nice big bit of round stock is living too.

[Ocean1]

Yep BOP Gears are good, there is also a firm in Pram that do gears which i can't remember their name. We used to borrow Gear cutting hobs between the 3 of us for special/oddball pitches etc. A deep Cycle nitriding should do the trick for heat treatment if you want to go steel, or hard anodize some 7075 if heat & expansion etc play nice.

Bettany Gears is the one in P'ram. And I suspect best practice might see gears running at those revs ground. Or lapped, if you can find anyone who know how nowadays.

[Sketchy_Racer]

Yeah, and custom parts are expensive.

Because I can design the geometry of the outer housing around exisiting parts, I am going to try find common parts that are cheap and easy to find. Alibaba is a perfect place to find parts.

This morning I have asked for a quote on 20 Oil pumps ($1-2 each) 20 compressor housings ($10-20 each) and 20 impellers ($5-10 each)

I hoping to get that as a small inventory so I can have a stable supply of more parts than I anticipate using but without much financial investment.

At the moment I am just looking through gears and different options.

The biggest pain is that the gears really do nothing for the supercharger apart from make it spin the right way, and adds complexity and weight to the unit. The reason I have the gears is because I am driving the supercharger off the left hand side of the engine. If I drove off the right hand side, I wouldn't need it, however it's a pain the ass to drive it off the right hand side.

So I am going to use the gears to help with the step up stage, hoping to get a 2:1 ratio at the gear set and then a 10:1 in the planetary gearbox giving a 20:1 ratio, which gives all levels of boost control.

I am thinking that the gears out of motorbike gearbox or the likes would be a supply of easy to find gears failing that I have found 2 suppliers of Spur gears

https://sdp-si.com/

http://www.wmberg.com/

hoping to have some luck there.

Once I get all the parts that I will no be manufacturing I can then design around them to create the best possible supercharger for cheap!

[husaberg]

I am thinking that the gears out of motorbike gearbox or the likes would be a supply of easy to find gears failing that I have found 2 suppliers of Spur gears

https://sdp-si.com/

http://www.wmberg.com/

hoping to have some luck there.

Once I get all the parts that I will no be manufacturing I can then design around them to create the best possible supercharger for cheap!

Some gears and shafts for the initial here Rob mentioned they were like $8 each.
It a big cattle dog have a fer-it arround
http://www.ncy-motor.com.tw/product3...earch=&page=13

[Ocean1]

At the moment I am just looking through gears and different options.

Worth talking to New Age Materials Computer Wreckers, they've usually got boxes of gears from wrecked mainframe hardware. At 226 Gracefield Road in Seaview.

Actually, worth a wander around their stock anyway, in a couple of years you'll be working on a completely different project and you'll be wondering where to get your hands on a certain widget and...

[husaberg]

Confession here
When i was thinking of doing something similar i tore apart a few angle grinders (i was thinking of mounting a few together)
I never actually put them back together either. the planetary gearbox is a much better solution of course.

[Sketchy_Racer]

Ok, so I have pulled the charger apart after running for a total of 30min, interesting to say the least and a lot of info gathered to improve the final design. Im just going to put some rubbish in here while it's fresh on my mind.

1: The length of the turbine shaft is critical. If the unsupported end is to far away from the bearings, at 200000 RPM the shaft will flex considerably causing severe damage to the impeller. It will still make boost however

2: Fluid drag if not controlled will cause the temperature to sky rocket incredibly fast, having the correct amount of oil is key

3: The outer ring needs to have parallel walls and cannot be a cup. The support at the bottom of the cup will cause the expansion to release contact at the end closest to the impeller and let the impeller float excessively.

4: 4 driving dogs at a small diameter are not enough, the shock loading of the on/off throttle will cause them to shear off leaving only one behind. A sprag clutch will help immensely with this problem, so will incorporated into the next
design

5: Phosphor bronze gears that are only 5mm thick are not enough to use as the change gears, the teeth will deform. An increase in width will help but precision ground gears would be better but add excessive cost, will look into options

6: Some form of seal on the turbine shaft is required, oil migration will happen despite having a vacuum pump draining oil out. A labyrinth seal may be the best solution here.

7: An internal oil pump and external reservoir, cooler and filter will make a big difference to thermal efficiency = More clean boost

But, the important part is that the rollers, shaft and outer ring had no signs of damage at all! This was the main objective with this budget test.

Anyway, I am about to start the conceptual design of Version 2

[Sketchy_Racer]

So after quite some time and a couple of other bike builds, its about time to get back into this.

I am going to start by cheating and using a AMR-300 Supercharger to start with and develop the bike/motor. Then as time allows I will continue on with the development of the small centrifugal supercharger.

Kyle managed to find a supplier of the small superchargers here

http://www.kemotorsport.com/

It was $280AUD including shipping for a good condition second hand or an extra $100 for a new one.

I'm hoping this week to have the bike running again and get some base runs and tuning done on the dyno without the supercharger so I have something to compare with

[Ocean1]

Excellent!

Gears. Don't die grinders have epicyclic reducers in them? Sometimes multiple sets? Be a cheap set of gears if they were man enough for the job...

[Sketchy_Racer]

The AMR300 Turned up and I've started learning the ropes on the Ecotrons EFI. Kyle and I put the charger on the bike and threw a belt on it, knowing that the ratio would be all wrong but thought it would be a laugh to start it up. Around 30psi while kicking it over. Might be a bit much perhaps.

I hoping that by running this charger nice and slow it will help with intake air charge temps!

[TZ350]

This is a great project, I am following it with a lot of interest, looking forward to a video of it, mostly so I can hear the sound of a supercharged 4T again, awesome.....

[Sketchy_Racer]

Yeah it's a cool project. Not without frustrations though. Spent all last night on the dyno trying to get a good base run on the motor before adding boost. managed a pathetic 7HP at best. Super flat curve which is good as the motor is only a 4 speeder. I really want to get the motor up around 10HP before I get the scharger on there but that might be a little optimistic.

Learnt last night about the VE and Alpha-N tables and where they work in relationship to the CUR_TpsUnTp_N So spent most of last night adjusting fueling in the VE table to ge no response in the engine! Oh well know that now I suppose.

Back to the dyno!

[speedpro]

If you are messing with the VE table adjust the software so the system uses the VE table for anything under say 95% throttle. That way you can be sure that changes to the cell values are valid. Then when you want to adjust the TPS table set the software so anything more than 10% throttle causes it to switch to the TPS table. Later you can set the switchover point to where it works best. My opinion now is that we need to use the autotune feature after we get it running more or less right. There is still some doubt about autotune results and where they are stored, which table, and exactly what happens when you switch to tuner desired lambda. It seems the autotune feature attempts to achieve lambda=1.