Forced induction 100cc

[NordieBoy]

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

They were also slightly bigger than 100cc per cylinder too...

[Sketchy_Racer]

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

Haha, maybe but I don't think the compressor map of this turbo housing will achieve that no matter how fast I spin it! Those sorts of pressures are where the power is at though

[ducatilover]

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

The BRM V16 ran even more... a long time before.

Where do you live Sketchy? I'm going to steal that blower.

[Yow Ling]

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.

We use a traction oil in a Graham drive on a machine at work $US128 for a quart plus about US 85 to ship it, pretty cheap when you consider the price of a new Graham drive , but bloody expensive for oil.

[koba]

We use a traction oil in a Graham drive on a machine at work $US128 for a quart plus about US 85 to ship it, pretty cheap when you consider the price of a new Graham drive , but bloody expensive for oil.

What is a Graham drive?
What is a quart?

[Sketchy_Racer]

We use a traction oil in a Graham drive on a machine at work $US128 for a quart plus about US 85 to ship it, pretty cheap when you consider the price of a new Graham drive , but bloody expensive for oil.

Got any spare?

Upon further research CVT oil offers similar properties, not as great as proper traction oil, but good enough for me to give a try. It appears that ALL forms of this traction fliud is extreemly expensive which is pain because I only need about 100ml, hopefully the CVT oil will work.

On another note, all the machining is finished for the charger so it's time to put together, but that will be tomorrows mission.

[Yow Ling]

What is a Graham drive?
What is a quart?

http://cvt-ivt.tripod.com/id1.html

quart is quarter of a us gallon about a litre

[Yow Ling]

Got any spare?

Upon further research CVT oil offers similar properties, not as great as proper traction oil, but good enough for me to give a try. It appears that ALL forms of this traction fliud is extreemly expensive which is pain because I only need about 100ml, hopefully the CVT oil will work.

On another note, all the machining is finished for the charger so it's time to put together, but that will be tomorrows mission.

Try the cvt oil first, it lubricates a metal belt on a metal pulley so kinda the same and only $200 for enough to fill a car transmission, if you have no luck pm me

[husaberg]

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

They were also slightly bigger than 100cc per cylinder too...

I know Warwick was joking but anyway the F1 fuel was 84% toluene.
I know Honda ran up to 43psi high a rather high Comp ratio too
the "M power BWM" life span for a qualifying engine was 7 minutes.
re the oil holey shit, i wonder how long it lasts LOL

[Kickaha]

the "M power BWM" life span for a qualifying engine was 7 minutes.

Around 100hp per 100cc out of some of Turbo era cars so what would you expect, maybe if Glen only aimed for 50hp per 100cc he could get 14 minutes

[Grumph]

Around 100hp per 100cc out of some of Turbo era cars so what would you expect, maybe if Glen only aimed for 50hp per 100cc he could get 14 minutes

So what lifespan were you aiming for at the last BoB ?.....15min at about 15hp ?

Jeez W you left yourself open for that one....

[Kickaha]

So what lifespan were you aiming for at the last BoB ?.....15min at about 15hp ?

Jeez W you left yourself open for that one....

Plus the practices and races before it, i reckon I got at least 20-25 minutes, thats longer than some have lasted

[Sketchy_Racer]

Its together,

It all went together perfect, my solidworks skills are improving as all the parts were made from a drawing to a specified tolerance to allow the assembly to work and it all dose!

So far on the end of the battery drill at 2000 RPM it has managed to make 1PSI But it will have to wait until tomorrow to test it out on the bike. Im still not convinced that the CVT will be suitable so I will still look at getting some traction oil. I am also going to buy a optical tachometer to measure the turbo RPM to engine RPM so I know the slip and try different oils.

On the end of the drill, you can't hear the turbine at all, just a whur of the gears. It'll be interesting to see if It will make a racket once it is spooled up

It is mounted in the bike and tomorrow once I finish putting the exhaust and stuff back on I will fire it up and see what it does. It's geared at a 1:1 ratio to start with so at 10,000 engine RPM the turbine should be doing 110,000 rpm if there is no slip. The maximum RPM is 250,000 for this turbo but I will limit my one to 200,000 rpm, more because the gears will far exceed the design.

[Sketchy_Racer]

Try the cvt oil first, it lubricates a metal belt on a metal pulley so kinda the same and only $200 for enough to fill a car transmission, if you have no luck pm me

Sweet, cheers mate.

I will try scrounge some Rotrex oil before I harrass you though as I only need 50ml of it which is probably the left over from a top up for a rotrex owner.

[Sketchy_Racer]

Well, it was on the bike and running, and it was totally silent! Couldn't hear it at all over the sound of the engine.

Running at 1:1 gave me the planned boost of 5psi at 8000 engine RPM, now that I know everything is working well and nothing bad happend I have made new belt pulleys to ramp the RPM up. The boost curve is exponential to RPM increase so at 200,000 RPM it should have a pressure ratio of 2.5 which give me about 22psi boost at 75% adiabatic efficiency (according the compressor map I found on the net)

Anyway here's to hoping.

One thing I do think I am going to have to do is run an oil pumo system. 15 minutes of running saw the gearbox temp rise to 60 degrees and climbing which isn't really that great, and would suggest that I am getting quite a bit of slip on the rollers however upon pull down after 30 mins of running there is virtually no marking on the bearings so who knows. I Am going to need to get some traction fluid I believe. Either way so far everything is working well and if it does perform as hoped then a full re-desgin will happen and I will try get rid of all the bugs in this "mock up" version.

Tomorrow I will get the new pulleys mounted up and see what we can manage, I have the option to one step further to get a 2.5:1 pulley ratio which would put me into 250,000 RPM at the turbine, this shit excites me!

Cheers,

-Sketchy