Supercharging?

[ducatilover]

I thought the bottom end on those Honda 250cc V twins was considered not to be strong? Reputation for big ends going? Need to consider that .

hmmm i think if i can source a spare engine [buckets and bits in naenae] ill experiment with that... i really want to do it though

[Shadows]

i dont want a turbo cos i hate the thought of lag

Nah dude, go turbo and get one of those things that go psssssssssssssssssssssht when you change gear! You could hang the 12 inch diameter chrome boost gauge prominently on your right mirror.

Then you could take out the shocks and cut down your springs to lower it, bungee a subwoofer on the back and swap your muffler for a 1.5kg baked bean can. Paint the can with that silver UHT paint.
You'll need some of those blue LEDs mounted on your bars too and dont forget the neon lights underneath.
Stick a little windshield over your dials so that you can tint it, and make sure you stretch black pantyhose tightly over your tail light and indicators.

You could plaster some NOS stickers on your tank, but I'm not sure where you'll be able to fit the www.ifeeltheneedtoadvertisesomebodyelsesbusiness.c o.nz sticker, and you might have some trouble finding new wheels which are worth at least 4 times the value of your bike.

Jokes aside though, I think you'd be wasting your time and money. I reckon you should save your cash and get a gruntier bike if what you have doesn't do it for you.

[23226]

Seems to be a few supercharging kits advertised in the back of UK mags from time to time, claiming 200hp+ from R1s etc.

Some did some speed testing on supercharged Gixxers and Bandits, and reckoned that they were unbelievably smooth, and massively powerful.

It's a shame they haven't taken off more on bikes, as I think they're better suited to them than a turbo. Even if less powerful, bikes don't need that much more power (how rideable is a 500hp 'Busa? Not very)

tts-performance.com do the odd bike supercharger and a few other things.

I want this one

[Mental Trousers]

Electric fans won't do fuck all except maybe prevent the engine from starving of air, but then that's a design issue of the bike.

But there's no reason why you can use something like a Sprintex type supercharger with an electric motor to drive it. That'd be an excellent setup as it'd be switchable and you can vary the boost at any time. Main problem is you'd need to upgrade the electrics and alternator to provide enough juice to run the thing.

[Ixion]

It would need to be a honking big electric motor. And alternator to match. It takes a shitload of power to drive a pump capable of suppling the volumes of air required.

[Mental Trousers]

Yep, it sure would. There's definitely motors available that can drive something like that, but the main problem is size and wieght. An electric motor grunty enough to drive a decent sized compressor is fairly heavy.

[Pixie]

I defy anybody to make a MEANINGFUL hp increase using electric fans.

In theory you're talking bullshit.

Supercharging - Compressor driven off crank - some of the total power gain goes to drive the compressor mechanically.

Turbocharging - compressor driven by exhaust pressure - uses waste energy,but back pressure reduces total power gain.

Electrically driven compressor - Some of the total power gain is used by the extra load on the alternator needed to drive the compressor

The only question is what is the efficiency of the various compressors and drives.
I don't regard a 750 cfm electric compressor as a "little fan".
One major benefit of an electric driven system would be that the energy needed to drive the compressor is averaged out of the entire running time of the engine.
When the engine is on boost,the power to drive the compressor is coming from the battery.When it is off boost the battery is being charged.
The load on the motor from the compressor is averaged out over the whole run.

[imdying]

Electric fans won't do fuck all except maybe prevent the engine from starving of air, but then that's a design issue of the bike.

But there's no reason why you can use something like a Sprintex type supercharger with an electric motor to drive it. That'd be an excellent setup as it'd be switchable and you can vary the boost at any time. Main problem is you'd need to upgrade the electrics and alternator to provide enough juice to run the thing.

Oh dear, where to start. Prevent the engine from starving of air? Actually, being a restriction to the inlet, it's more likely to cause it to starve for air.

An electric motor to drive your supercharger... hmmmm just how big a motor do you think it would take to drive an air pump that can pump enough air to create boost on a motor that is already consuming large quantities of air? Yep that's right, a massive one. Now, what are we going to drive this massive electric motor with? The battery? hahahaahha... we're gonna drive this motor that is substantially larger than a starter motor with the battery? I feel another Tui ad coming on here... Upgrade the electrics? That's a bit of an understatement.

You've probably heard that at maximum output a supercharger is using as much power as it's generating? (massive massive generalization) Well if you're wanting another 60hp, that means a 60hp motor... that's not little

[imdying]

In theory you're talking bullshit.
Electrically driven compressor - Some of the total power gain is used by the extra load on the alternator needed to drive the compressor

Read his post again... he said electric fan, not electric compressor... I think you owe him an apology

[Pixie]

Read his post again... he said electric fan, not electric compressor... I think you owe him an apology

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

[imdying]

Not semantics at all.. someone (N4CR) had talked about using computer fans, and as wicky as a Delta is, he was telling them they were out of their mind. As the link that was provided to the eSupercharger is nothing more than a fan, his comment was also relevant to that also.

It's also worth noting that an electrically driven compressor would technically work as a supercharger, it's just that the massive infrastructure (wiring, charging, battery, whatever) to support it (not to mention the massive electric motor itself) is 100% impracticle.

His usage of 'fan' and not 'compressor' is far more important than mere semantics. When he said 'fan' he was correct, if he'd said compressor, he'd have been wrong. That's not semantics, but a critical detail, and you've called his statement bullshit, which clearly it isn't. You still owe him an apology

[Biohazard]

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

[Mental Trousers]

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.

[MikeyG]

Cheaper set-ups have the blower between the carbs and the engine. I think you need special carbs or fuel injection to have the carbs between the blower and the engine.

[SARGE]

how dp people go about supercharging a small engine? is it possible to say, mount the supercharger on top of the carbs?
if some idiot was thinking of doing this to a vt250 spada how would said idiot do it? please help me out here.... im thinking a subaru vivio sunit or maybe a small digger unit. i dont want a turbo cos i hate the thought of lag

why not just get a Gixxer 1000?.. 250's are throwaway bikes ..