Supercharging?

[Pixie]

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

It's always easier to buy a quicker and better handling bike or lose 20 kg off one's fat arse.

[Pixie]

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

Why not get an RZ 350?
64 hp standard

[Pixie]

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.

Ok then.
All the piston compressors that I've worked with,in 20 years of servicing medical analysers,aren't compressors at all,they're pumps

[Pixie]

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.

Ok then.
All the piston compressors that I've worked with in 20 years of servicing medical analysers,aren't compressors at all,they're pumps.
s'funny,you'd think the compressed air industry would use the correct terms?

Any action that moves a gas,compresses it.Even a bike move through the air,or your colon.
I challenge anyone to refute this.

[Motu]

Ok then.
s'funny,you'd think the compressed air industry would use the correct terms?

I worked in the compressed air industry,admittedly 25 or more years ago - and we sometimes called them pumps,a bit loosely.Like,I might of been told to go and take the pump off and bring it back to the workshop.....we knew they were pumps....but really they were compressors,because that's the market we were in,compressing air....

[popelli]

if you want to go faster get a bigger motor

a good big motor will always beat a good small motor

[Jamezo]

Ladies, ladies, please. There's only been one kind of sensible suggestion made in this thread, and it is the kind that smokes. Both from the exhaust, and figuratively speaking, bikes with too many engine strokes.

[stanko]

Ok then.
All the piston compressors that I've worked with in 20 years of servicing medical analysers,aren't compressors at all,they're pumps.
s'funny,you'd think the compressed air industry would use the correct terms?

Any action that moves a gas,compresses it.Even a bike move through the air,or your colon.
I challenge anyone to refute this.

Convection moves a gas but has no compression, a ceiling fan moves a gas but no compression.

Moving a gas from a high pressure container to a low pressure one does not compress the gas, looks like you need another 20 years or so on the tools !

[Fooman]

Ok then.
All the piston compressors that I've worked with in 20 years of servicing medical analysers,aren't compressors at all,they're pumps.
s'funny,you'd think the compressed air industry would use the correct terms?

Any action that moves a gas,compresses it.Even a bike move through the air,or your colon.
I challenge anyone to refute this.

Well, here is something to really screw with your head - The quicker a fluid flows, the lower the pressure in that fluid (if the flow remains at the same height). This is one part of a fundamental relationship for all fluids that was discovered a couple of hundred years ago, by Bernoulli (one of them - there were lots...):

For any fluid, the sum of pressure, velocity and head is a constant, or

(velocity squared)/2 + (acceleration due to gravity)*height + pressure/density = constant

Simply this is an energy balance equation, harking back to Newton.

So, at the same head (height), the sum of velocity and pressure is a constant. Therefore if velocity increases, the pressure must decrease!

That relationship is pretty much the basis for a lot of fluid mechanics.

Now to tie everything togther, a two-stroke cylinder (which is a piston compressor!) without a head is a pump. With a head, it's a compressor.

Easiest way to supercharge a VT250 would be to turn it into a SC125, bore out the rear cylinder, so it displaces more than the front, and use that to pump more than 125cc worth of air into the front cyclinder!

FM

[Gazman]

Guy down this way had a supercharged V-Max, biggest problem was keeping the front wheel on the ground.

hehe

[Ixion]

,,,Easiest way to supercharge a VT250 would be to turn it into a SC125, bore out the rear cylinder, so it displaces more than the front, and use that to pump more than 125cc worth of air into the front cyclinder!

FM

Come back DKW , all is forgiven.

[Edbear]

It's always easier to buy a quicker and better handling bike or lose 20 kg off one's fat arse.

Believe me, it ain't easy losing 20kg!

[imdying]

Come back DKW , all is forgiven.

Ahahahaha, you old fart!

[Lou Girardin]

The Roots blowers, which were originally called cabin blowers, just move air. The compression occurs at the closed valves. Helical type blowers compress air within the unit.
When my Mazda suffered the dreaded crank keyway problem, the altered valve timing caused manifold pressure to rise to 9 psi.

[imdying]

Was that one of those pressure wave supercharger 2L diesels? They worked a treat they did Digusting how little gas they'd use on state highway 1 at 160km/hr in the dead of night