is it possible to add Turbo charger to the bullet??

[pistone]

Thanks for the interesting thread Sid,

I am not warm about choppers due to its ugly handling but it sems a well done job! 

About mounting a turbocharger on a single engine, a 700 cc displacement can make the turbo lag a bit lower but cannot solve the problem of "pulse" .

A supercharger "jointed" to the engine through a properly sized  "air box" could be better.

Some years ago, a tuner called Ivory maked a Yamaha XT 660cc with supercharger which worked realy well, allowing a small batch production of 20 bikes but is quite difficult to find information about its work on the web.

In the old period (about the fifties) the famous italian brand MOTO GUZZI used both a single 250cc ad a V twin 500 cc (similar lay-out to a Ducati engine) coupled to a supercharger.

The 250 scored some landspeed world records and won several races , it demonstraing the good function of supercharged also with a single engine of medium capacity (if fitted with a pressure-chamber between the intake manifold and the blower).

On the opposite, I think the "funny" show-bike with turbo a good object to look but with 40 HP "only" is surely slower as an "atmospheric" tuned Bullet....


A blower Bullet can work well but it need to improve all the internals to resist to the big torque given by  the blowing action.

I hope my English is clear enough...   I know engines (and blowers) but don't use my English language since 2002   

Cheers
Fabrizio "McDeeb" Di Bella

[Ice]

Don Pistone,

  Your English is fine.
 My Italian ?,,,,is so bad it would make your ears bleed to hear it.

Ciao,
Ice

[pistone]

Hi Ice ,

if you think my English as "fine"....you probably like my Chinese, too !   

When I travelled a lot for work ,  after spending a nice period in L.A.
 I improved it , while staying some months in  Taipei (Taiwan) i was able only to use the local language to find good food...and girls (not so bad as I supposed).

I still remember some nice places in California and funny engines I had the chance to use there...

My favourite was a Pontiac Trans -Am  and the terrific Cobra of a friend of mine who lived ten years not far from Hollywood.

Now both us  are came back to Italy but frequently remember our "american period" with some nostalgia and I like to go there again in future.

Ciao America !     

Fabrizio

[ace.cafe]

Thanks for the interesting thread Sid,

I am not warm about choppers due to its ugly handling but it sems a well done job! 

About mounting a turbocharger on a single engine, a 700 cc displacement can make the turbo lag a bit lower but cannot solve the problem of "pulse" .

A supercharger "jointed" to the engine through a properly sized  "air box" could be better.

Some years ago, a tuner called Ivory maked a Yamaha XT 660cc with supercharger which worked realy well, allowing a small batch production of 20 bikes but is quite difficult to find information about its work on the web.

In the old period (about the fifties) the famous italian brand MOTO GUZZI used both a single 250cc ad a V twin 500 cc (similar lay-out to a Ducati engine) coupled to a supercharger.

The 250 scored some landspeed world records and won several races , it demonstraing the good function of supercharged also with a single engine of medium capacity (if fitted with a pressure-chamber between the intake manifold and the blower).

On the opposite, I think the "funny" show-bike with turbo a good object to look but with 40 HP "only" is surely slower as an "atmospheric" tuned Bullet....


A blower Bullet can work well but it need to improve all the internals to resist to the big torque given by  the blowing action.

I hope my English is clear enough...   I know engines (and blowers) but don't use my English language since 2002   

Cheers
Fabrizio "McDeeb" Di Bella

I've theorized that on an AVL, if a person restored the idler gears back into the timing chest, which were used on the Iron-Barrel model to drive the distributor, that the supercharger could be driven by that, and located under the carburetor area on the AVL.

That would be a drive system that is very close to the carburetor, and gear-driven directly off the crank at half-speed.
Might be a nice place to start.
A small supercharger might fit in there.

[pistone]

If we live not so far, my proposal will be probably to make it together!   

I have some supercharger but mostly are a bit too large for a Bullet...one could be useful...mumble mumble

[Darth Sid]

Pistone, I'm with you on the chopper part. I like the exotic ones for their looks but would probably never ride one for the reason you mentioned.

The discrete pulses of the Bullet's exhaust clearly don't help drive a turbo efficiently but it sure seems like an interesting job.

Won't adding an airbox between a supercharger and the intake cause some condensation of the fuel in the (somewhat) compressed air-fuel mixture?

Ace, now that's a mind stirring idea. One of those that make one go, "Why didn't I think of that?" Whether one actually goes ahead with it is a different matter but the thought wouldn't hurt.

[pistone]

I think a Bullet engine could be great for a old school bobber (and we are going to work on it) but consider that kind of bike don't need a so powerful engine, then a big bore conversion with orthodox methods can be enough,..

About the mixture/box , it works to allow a "smoother" function of the supercharged engine also on my ex-Yamaha XS blower unit....also if "smooth" is not the proper word for a supercharged bike 

Some years ago, while testing ithis kit on a old Bonnie on public roads, the bigger trouble was the rear tyre "funny" slippering since I entered the third gear, while a long and dark rubber thread remained on the ground...luckily the clutch destruction helped kill me to stay alive 

About a supercharged Bullet, I think is right also considering the engine age : the blower was tipical of the drag bikes golden age while turbo come in the late seventies and eighties.

I was in contact fro a long time with Tony Brown, son of the famous world recordman George, with his famous Super Nero, based on a Vincent twin coupled with a Shorrock blower, and he gave me lots of suggest about superchargin' on motorcycles.


George took 21 world records on the standing quarter mile  as on the mile land speed while Tony "only" seven titles, also driving his dad's bike after his premature death : he is a real gentleman who doesn't like to speak a lot but his knowledge about blowers is terrific.

He don't like turbos...as me! 

Chhers
Fabrizio

[Darth Sid]

Why do you prefer the supercharger to the turbo? It uses some energy to operate, doesn't it? I will agree with you that it would more suited to the Bullet than a turbo considering its design.

[pistone]

The turbochargers make the temperature too high, it work thanks to the exhaust flow so it work worst due to the tipical "pulse" action in a single engine as the Bullet.

I hope my exposition is clear enough... 

Consider that the best drag bikes use a blower instead of a turbo...

I dont like turbo on two wheels , too.
You can avoid a turbo-lag on cars but on a motorcycle this effect icould be dangerous.

Blowers start to work also at minimal revolutions, while the turbo need high rpm to give a good output.

[Darth Sid]

I thought you were against turbos in general. I already knew why a long stroke single's exhaust is not suitable for a turbo. However, I didn't consider the safety aspect. That can indeed be very dangerous on a motorcycle.

Also, the workaround to temperature problem of a turbo would make its design quite complex. So, I guess you're right about the supercharger being more suitable to this application. I sure won't help fuel economy, though...

There is a person in India who rebored his 150cc motorcycle to 200cc and installed a roots-type supercharger that he fabricated himself to make it go faster. He claims to have won a drag race against a Yamaha RD350! Further supports your favour of the blower.

[pistone]

I like turbo on cars: I owned three Sierra Cosworth RS2000, one Escort Cosworth Rs, one Fiesta Turbo (a bit dangerous mighty car) and now I drive an Audi A4 1800 Turbo 20Valvles....but for motorcycles you're right: I dont' like turbo so much.

Nevertheless in my workshop now there is an old Kawasaki GPZ750 Turbo which I like to drive sometimes...

But blowers are fantastic !   

[Gregorin]

I think no possibile because single cilinder.

[Forced Induction]

Wow guys. I did not imagine I would find my little project bike mentioned on this forum. Am happy to know there are some more nuts like me who want to sees a supercharged bullet.


Please see the update to the project (which is also 6 months old)


http://www.xbhp.com/talkies/thumpers-two-stroke-exotics/17262-presenting-worlds-first-supercharged-enfield-rr700-prostreet.html

As some people said, turbo does not work for a low revving single cylinder. So I took it off and ran it in naturally aspirated form for a year. In NA form, bike was about 40 bhp but with very high torque as bore has been extended from 94mm to 115mm. Acceleration is amazing.  Bike is 684cc with standard bore of 87mm.

Now, we have put on the supercharger, and have to start testing it. Sadly got no time last summer. Also I bought a new toy (ducati diavel) and got busy with that. Now hope to finish this project this winter if my tuner Ranjit has time - fingers crossed.

By the way, the bike handles very well, much better than the original bullet. Also, is only 11kg more than the new 500classic. With the good brakes and hondafireblade sourced suspension, it's very safe too. The rake is not like typical cruisers, and riding the bike in bad Mumbai traffic is easy.

I hope with the supercharger and 5psi of boost, we will take it to 60bhp, which will make me very happy.

@pistone: thanks for your comments mate. You really seem to know what u r talking about.  If it's ok with u, I shall pm u for advice when we get stuck.

Thanks all for looking and cheers

Vivek

[Forced Induction]

Alright ladies and gentlemen, the Prostreet 700 is now ready. 684cc of supercharged vintage brit iron...a world first. Took the bike out on a 250km round trip last Sunday morning. Handled and ran really well. I am breaking the engine in so did not push it too much. Still, on the return leg, took it to 125kmph...which the bike did effortlessly.

The bike also won the 1st prize at Rider Mania 2012 held in Jan end at new Delhi. Rider mania is the worlds largest royal enfield festival. Am putting a link to some pics I put up at another forum.

http://www.xbhp.com/talkies/thumpers-two-stroke-exotics/21493-rm2012-winner-best-custom-bike-worlds-1st-supercharged-enfield.html


I have ordered a TM36-68 flat slide carb which will make this babe really fly. Will try to do a dyno run once I have the new carb on.

Cheers