Supercharging?

[RiderInBlack]

These guys do high power compact electric motors. Can't find one that only makes 60hp though. However, the motors listed there are used in electric bikes (have a look at the some articles). They're too large but there are motors available that are small enough and grunty enough. Problem is wieght and feeding them.

So would it not be easier ta cut to the chase and have an electric bike or a hybrid one (like this ).

[willy_01]

There is no 'easy' way to get 60rwhp out of a 250cc, however if you buy a 250 rd/rz upgrade the bores, pistons, rods, pipes and carbs? (to a rd350, looks the same so you would get away with it 9/10 times getting a wof) and you have 69hp at the crank(I think), im sure skimming a wee bit off the heads, a re-jet and air filter should bump up the power to meet your requirements. Supercharging when done right may produce a dependable 60rwhp but the time and money to get it to this point would most likely cost more than what the bike cost you, Im guessing you would need to have a good efi set up aswell.

best of luck, if you did do it it would be very cool to see

[ducatilover]

Wouldnt it just be easier if you buy a quicker bike .... just a thought

the only other 250 id consider is an rs250....but if i wanted power band type performance i would turbo the spada...

the reason for not getting a faster bike is... what other twin will handle like my spada??? especially when i find a decent front end to stick on

[Fooman]

Semantics
I assumed he was using a common term,rather than the correct one.
The term "Blower" for a supercharger is technically wrong,too.
They are all compressors

Well, it depends. A Roots-type blower, commonly used as a supercharger, is not a compressor. It's a postive displacement pump. It just moves X amount of air from inlet to outlet. The air compression happens after the blower, when you're trying to fit X amount of air into X/2 amount of cylinder.

Axial flow compressors (e.g. the compressor in most jet engines), centrifugal compressors (e.g. turbos), rotary vane compressors, screw compressors (Eaton, PSI) all compress the air (i.e. a change in specific volume of the working fluid) during flow through the compressor as well as shift the mass.


Cheers,
FM

[Ixion]

Tecnically I guess the distinction is between fan and pump. And even that is maybe vague. But the guts of it , that for supercharging to work , you have to have something that can force air or mixture into the cylinder at a positive pressure. Which a fan can't do - or not at enough pressure.

[Mental Trousers]

So would it not be easier ta cut to the chase and have an electric bike or a hybrid one (like this ).

With those motors, yes it would!!!! Me, I'd use a little gas motor to run an alternator to put out the juice for the electric motor. Dunno how big that'd have to be, but I'd say it'd be a better option than carrying half a ton of batteries.

[imdying]

the reason for not getting a faster bike is... what other twin will handle like my spada??? especially when i find a decent front end to stick on

Compared to the new R6, your bike will handle like a bucket of shite, no matter what front end you put on it. And even if it didn't, there's no road or track where the 80hp difference doesn't count.

[stanko]

With those motors, yes it would!!!! Me, I'd use a little gas motor to run an alternator to put out the juice for the electric motor. Dunno how big that'd have to be, but I'd say it'd be a better option than carrying half a ton of batteries.

See this is what is so silly about this thread. You would get an alternator, cabling and a motor to transfer a Kw or so less than 300mm. Why not use a shaft 14mm diameter 300mm long and save about 30kg?

[imdying]

See this is what is so silly about this thread. You would get an alternator, cabling and a motor to transfer a Kw or so less than 300mm. Why not use a shaft 14mm diameter 300mm long and save about 30kg?

*hugs*

[Motu]

Tecnically I guess the distinction is between fan and pump. And even that is maybe vague. But the guts of it , that for supercharging to work , you have to have something that can force air or mixture into the cylinder at a positive pressure. Which a fan can't do - or not at enough pressure.

Or more specificaly you need a restriction to create the pressure - like trying to stuff it into a closed end container.The Roots blower is mostly used on 2 stroke diesels,and that's just what it does - blow.It is there to scavange the exhaust gases,it doesn't add anymore air,but does fill the cyl completely which normal induction doesn't...so there is a power boost.The GMC blower was lifted from GMC diesels (later called Detroit Diesel) and put on top of a V8 for the classic supercharger application.Other Roots blowers were used on the Rootes TS3 and the Foden 2 strokes.

[Lou Girardin]

Semantics
I assumed he was using a common term,rather than the correct one.
The term "Blower" for a supercharger is technically wrong,too.
They are all compressors

Roots blowers aren't compressors. They are displacement pumps. They don't have any internal compression, unlike the vatious helical rotor types.
I had an Eaton unit on an MX5, it produced around 175 - 180 hp from 7.5psi boost. That doesn't sound much, but with boost and real torque from 1500 rpm it would leave a Cosworth Sierra up to 140 k's.

[imdying]

Ok, so we've all decided:
- Forced induction is a waste of time on a 250
- Electric superchargers are snake oil
- A fan can't compress air, or create any sort of boost
- Ducatilover needs to get a bigger bike (like a 916 )

[Ham]

cram a TL1000 engine in it... would be cheaper easier, faster, and probably lighter

[Kickaha]

.. 250's are throwaway bikes ..

So are Gixxer thou's if Dover is riding them

[Mr. Peanut]

the only other 250 id consider is an rs250....but if i wanted power band type performance i would turbo the spada...

the reason for not getting a faster bike is... what other twin will handle like my spada??? especially when i find a decent front end to stick on

My Bike X 2?

RS250's are overrated, If I spent $10000 doing up an NSR250 it would be faster (or equal) and more reliable.