Hi all,

New to this but..
I know about Bob's turbo Z, what about a compressor?

No turbo lag.
No exhaust piping horror.
No intercooler needed on these modern ones like eaton M45.
Small, not too expensive units availiable.
Almost doubles power.

This guy (http://www.kompresso...i.de/kguzzi.htm) sucessfully put one on a moto guzzi and bmw.

Please share your view!

Supercharger, right? Sounds good but my first thought is how to drive it and where to mount it. Since there's no handy pulley anywhere and things are kinda tight back around the countershaft, plus anything driven off the chain might also have to move with it I'm thinking it might not be so easy. But, it's a new thought and who knows. Maybe some kind of machined adapter to drive it off the left end of the crank (through the timing hole). Street only.

Might be good for a brainstorming session where no ideas are laughed at (until the end). :p

Think is't much harder to build a supercarged bike than a turbo.
The charger is usually belt driven ,and you will have to make a new engine cover and drive for the belt.
You will also need to make a new airbox.
I've seen supercharged bikes , here's one they used 8 months of specialist engineering to build :
http://www.superbike...ews_279468.html

I wouldnt think itd be worth it and I doubt it would work. Problem with superchargers is they take a descent amount of power to turn them. so your taking a 30hp motor and using up 10hp of it just to turn a supercharger. You obviously wouldnt be able to run high boost without MAJOR work to the motor. so u figure even if you get a 40% hp gain from it (which I doubt it would even be that much), that puts you at 42hp, take away the 10hp or so you use to turn it and congrats your at 32hp and you just spent $6000-$10000 for 2hp. Thats why almost everyone uses turbos on small motors (ricers, crotch rockets, drz's) because it is "free" power, as in it takes no power to make power. Thats why you usually only see superchargers on big block motors like monster trucks and old school drag racers, because there pushing 500-700hp already even without the supercharger so they have the extra power to burn.

I won't restate what is above...

But they do need interecoolers. You compress air... it gets hot. I don't care how efficient the compressor is... the natural gas law says that pressure and temp are inverse.


OK... so we don't get caught up in symentics... they are normally called aftercoolers on supercharged aplications... and you will find that they are water to air units.

If you want reliable power, you will need to cool it down so air density is there, and that you don't cause preignition.

I'm they guy who does things becasue people say not to... but in this case, I think it's a bad idea.

Quote

There is quote I am going to borrow!! :ride:

Thanks for the responses!

Bummer, i hoped for a different response from dr Honda.
Some say small engines can be supercharged effectively.
I've seen a 120cc honda /w supercharger, almost doubled power.
The 10 hp needed to drive it is less for a smaller unit i'm guessing.

I agree on the compression/heat law, but Eaton clearly states 'no cooler needed'.
Turbo's compress air too and don't always need coolers.
The old style roots compressors make very high pressure spikes.
The Eaton screwtype compresses in a more continuous way.
The guzzi does not need a cooler, uses the eaton.

I was thinking of a drive trough the inspection hole.
Mounted in the statorbolts or something.

keep your thought coming!

My $.02

Do an indepth read of UncleBob's build. He is the first to admit a turbo DRZ is a ridiculous concept. At the same time, it is tons of fun. Just like marriage.

Any time you are involved in a major one off project, it takes a lot of knowledge and access to the right people and equipment. Not a problem if you have bottomless pockets or are a tinker like Bob.

Can it be done? sure!
Will it make more power? Yup!
Is it at all practical? Not by a long shot.
Should you do it? Do you feel lucky, well do you?

any turbo or supercharged application should always use an air/air cooler AT LEAST, air/water cooler is the best though. Even meth/water injection is good. Companys say they dont need one because you can "get away" without it and because guys think oooh, ok, ill save money. Fact is cold air makes way more hp then warm air and is way safer for your motor.
Not to start a huge debate but in my experiance (which im pretty well experianced in power adders) any supercharged engine and the power it takes to spin a supercharger is relative to its intake size and throttle position. Full throttle just about any supercharger is going to take 20-25% of the HP of the motor to turn the supercharger. I.E. a 3500hp top fuel supercharged dragster is using up about 750hp to spin the supercharger (I kid you not) as well as a drz with a supercharger even making 50hp is going to use 10-15hp to spin its supercharger. Granted at an idle, or cruising speed you may not even feel HP loss at all.

First... Willam... you're back!!

Second... OK... I supercharged a mini-bike back in the day. We used an "A.I.R." pump (or smog pump as some people called them) from an old Chevy station wagon. It worked... and made more power by the butt dyno... but, it was something to do in the high school auto shop, and it didn't have to live for more than a few rides. Whereas, your DRZ should live a reasonable life.

Your comment about "They didn't need a cooler"... well... yes they do. You don't have to put one on, but you may not make much more power over stock. I've set up a bunch of turbos, and supercharges over the years... and many of them work fine... but they were by no means efficient.

I would love to see a DRZ with a blower/supercharger/compressor... whatever you want to call it... but it would be a "look what I did" project. It would add a lot of extra weight, and complexity to the bike, and it would kill it's offroad ability because of all the extra parts.

IF I would ever attempt putting boost to the DRZ... I would turbo charge it. It's essayer to weld pipes, than to machine parts that have to spin up to 10K RPM's.

Remembered this from my Magna days...

http://users.metro20...upercharger.htm

William! you're back!

Yup, back spewing mis-information!

Welcome back William, how's the rat poison going?! Sorry .... off thread!

Dan

Cuchara Red said:

If I were to do such a project, or try to, I would drive 1/2 of a turbo that would produce the flow at the rpm I could drive it. I would drive it from the starter drive hole with the starter drive gear sprag (one way roller clutch) installed backwards. I would mount the carb sideways, find some oil source and let it return to the breather box. Add a kickstarter, and lots of cash for r+d and there you go. Not that I have been thinking about this or anything. My way you could spend/would spend lots more than Eddie building you a proven motor, but not as much of an education. Good luck, CFC