Forced induction 100cc

[Drew]

Fuck all that shit. 10kg No2 bottle ought to last a day on something as small as 100cc.

Wish it was allowed, 2 stroke with direct injected nos would be fucken awesome. Though, you'd need a garden hose straight from the fuel tank into the cases to stop it from leaning out.

[Sketchy_Racer]

may I ask, where did you get the little supercharger from?

I got it from here

http://www.kemotorsport.com/

I got the AMR300 but I would be interested in getting a smaller smog pump and trying them too.

It doesn't have to be a tandem, a 360 twin?
I seen a pic the other day of the supercharged 1939 250 single Motoguzzi gp bike it had a Plenium that looked the size of 10 litre bucket.

Glenn if you do want to do a twin I have about 2 fzr250 engines here in bits if you can get them up to you can have them.

(can't find a decent pic but have a look at the blurry 1939 one)
Attachment 306993
(later he scans a pic)
Attachment 307001

Thanks for the offer husa, but I'm going to tackle the single first. I don't think supercharging the single is going to be too hard. Probably a lot easier than turbo charging!!

Maybe I should send my FZR to you and you could fit the AMR300. The turbo is not going t be as good, certainly on a kart track

No no, we can't have that. You have me all excited about having a turbo charged bucket out there now!

[speedpro]

I have a reconditioned smog pump off some sort of big block yank engine. You can have it. Very interesting inside, rotary vane type of pump. They aren't really designed to provide any pressure so evidently too much over 5psi is pushing it.
I'm planning to go to Wanganui on Boxing Day and possibly to Wgtn in the days after so could bring it down.

[Sketchy_Racer]

I have a reconditioned smog pump off some sort of big block yank engine. You can have it. Very interesting inside, rotary vane type of pump. They aren't really designed to provide any pressure so evidently too much over 5psi is pushing it.
I'm planning to go to Wanganui on Boxing Day and possibly to Wgtn in the days after so could bring it down.

Sounds interesting! I'm going to be at wangas so hopefully we can catch up there otherwise if you are coming to wellington you will literally drive past my door step if you would like to pop in?

[speedpro]

After making my generous offer I thought I should go and see if I can find it. It's probably in cupboards with bikes leaning on them. I'll check tomorrow.
No solid plans about going to Wellington, just looking at a day trip to Picton whenever we get there and if we can get on the ferry. Pretty definite about Wanganui.

[Flettner]

I got it from here

http://www.kemotorsport.com/

I got the AMR300 but I would be interested in getting a smaller smog pump and trying them too.

Thak you, they look well priced.

[husaberg]

Just seen this...........
http://s-charger.com/50cc-supercharger/

They are developing a 125cc version.

[Grumph]

The trouble with small blowers is that the loss of efficiency from clearance issues is multiplied due to the small size. if i was doing a blown 100, I'd be looking for a blower at least 250cc displacement and probably bigger. Run it slow and it stays cooler.
The only other viable alternative IMO is a geared up, belt driven centrifugal blower - probably the pressure side of a decent sized turbo. It wouldn't be any peakier than some 2 strokes. But bear in mind it needs to be pretty big - around 150mm dia impeller i'd reckon.

Husa - if you're bound and determined to give the FZR250 stuff away, give it to Muzza when he comes over for the pre 82 cup...I can do something with it.

[husaberg]

the AMR300 is pretty ideal for 1/2 end=gine speed and petrol granted
Re the engine did Santa not get any engines for Xmas..........


I just read the rest of your post I think a screw compressor would be the way to go an a small engine, likely suitable sized available ones from air conditioners.

[F5 Dave]

. . .
The only other viable alternative IMO is a geared up, belt driven centrifugal blower - probably the pressure side of a decent sized turbo. It wouldn't be any peakier than some 2 strokes. . .

just careful where you are going with that Greg

[Grumph]

just careful where you are going with that Greg

I'm not claiming it would be any more reliable either....You'd have loved Mike Sinclair's T20 - I rode it back in the day - 800 RPM power band...

The prime example of how a centrifugal blower delivery works was the V16 BRM. All the drivers said you couldn't drift it as you'd start the drift at the bottom of the powerband and it'd build boost so quickly you couldn't hold it...round you went. When the thing was out here i saw it run at Wigram - it pulled wheelies out of the hairpin !!

Husa, i'm sure you've been saving that pic for the right moment. It's passed.

[Sketchy_Racer]

Well, I have a new clutch again and this time I made sure that it is tight! Hoping to get in the shed today and get some power runs with a bit of luck.

We had it running yesterday and I managed to get it to do a intake backfire, the pop off valve worked a treat and released all the pressure (and flames!) then sealed straight back up so really happy with that.

As for the supercharger, the AMR300 is running at a 2:1 under drive from the motor and seems really happy at that. Probably going to have to under drive it even more as the boost is up over 20psi and I really only want to start at 15psi so a new pulley may be in order.

[Sketchy_Racer]

Ok so too much boost. Going to have to make a new lower pulley. I found these guys over in Oz who have a supercharged XR100 which looks promising. They are getting 27.5hp out of there motor in the same configuration as what I am running at the moment. I need to spend a bit of time now and get the ignition timing right and look into the cam timing also.

At the moment with the blower running at half engine speed the intake air temp is far too hot (100+ Deg) so im hoping that when the boost is dropped down it'll improve a lot!

Also running at those revs the supercharger gear box gets very hot, I might have to investigate because it is nothing but two spur gears timed together so not sure why it's so hot.

And finally the carb that I have is rooted so i'm going to get a new one and a jet kit.

So far it's looking promising though. Even with this terrible setup at the moment we're close to double the original HP of the motor (which is not impressive at all) but just need to get everything dialed in and it'll sing!

[Flettner]

Can you thin the supercharger down to get the desired volume. I once thined a Wade supercharger to 30mm wide for one of my original Honda 100's.

[Grumph]

Can you thin the supercharger down to get the desired volume. I once thined a Wade supercharger to 30mm wide for one of my original Hoda 100's.

Ah, the good old diesel wade with alloy shafts. gave my last one away. Better to use a big blower run slowly, even if it seems like it's blowing mixture up in big chunks. never seems to make a significant difference to carburation or the way the thing responds.