tossin a carb idea around would like input

[bigooomp]

ok so ive not had a whole lot of time lately to tool around on the 87 1100 got it about half stripped down and have tgo say the intake and carb setup dont impress me. im tossing around an idea to use mandrel bent tubing and a plate to bring carb out the rh side of the engine and possibly change to a single carb. has this been done already? also what carb and size would be recommended if possible? what about jetting? aint worried about time as i want this bike to be my work of art even if i miss out on some or all of riding this year. besides only having saturdays to work on it kinda limits time anyways. thanks yall

[oblivion_twister]

I saw it attempted over on shadowriders but not sure if it was ever finished or given up on. Was probably on a vt750dc

[gat803]

Yes it's been done.
Do a search for a member named Gonzo and his Spirit 11 he calls "Vicious".

[bigooomp]

Man Vicious is an awesome ride, thanks for pointing me in that direction.. but ive got to wonder if infact using the iron pipe as he did if its an actual power rob as the inside of that pipe is not normally smooth, as well as the fact all those joints there are going to be gaps in the tunnel walls.. knowing it can be done tho i think im going to work more with the idea of a thick walled tubing that i'll run a hone through to make sure its smooth..also running the single tube to each jug makes me believe that i have a better chance of each cyl getting roughly the same amount of fuel where having them linked as he does it only makes sense that the first in the line would be getting the majority or am i wrong in guessing this?

[Gonzo]

I think you are slightl;y wrong in this. The carb is metering a certain amount of fuel at a certain amount of throttle opening. The vapor is introduced into the intake manifold each time a piston is drawing in its gasp. then the intake valve closes. The second piston can then takes it's gasp from the manifold on its stroke.

While drawing a gasp of vapor, the opposite cylinder intake valve is closed so the vapor has to come from the carb.

Vicious has run strong with this setup for years and all across the country. I would have looked at tubing if I had the room, but my fat tank sits so low, I dont have room for but one tube to exit.

Gonz

[Buicknick72]

Gonzo, interesting project, did you have it Dyno'd? Did you run any calculations for intake runner length, or did you just use what fit for the bike?

bigooomp- What aren't you impressed with in the stock setup?

[Buicknick72]

Originally Posted by bigooomp

also running the single tube to each jug makes me believe that i have a better chance of each cyl getting roughly the same amount of fuel where having them linked as he does it only makes sense that the first in the line would be getting the majority or am i wrong in guessing this?

A single tube isn't so much a problem. I'd actually be worried about the first in line, the one with the T, being starved at higher RPMs. That 90degree T will not be good for high flow numbers. I guess it all depends on what you want to get out of it.

Did you run any cylinder balance tests at while driving, or individual exhuast o2/temp readings?

[PainterD]

I've always wondered why some twin cyclinder bikes use two carbs and others use a single carb? I'm sure there's more to it than just performance. I never did care for the dual carb setup on my 1100. It's a pain to get at, a pain to remove and re-install them and just not the way I would build a bike.
I'd like to change mine over to a single carb also, just to simplify maintenance if nothing else. I think I'd fabricate a twin mainfold our of smooth tubing, welded into a more V-shaped intake instead of using a T-shaped, with a flange to mount the carb onto. I'm sure the length of the intake manifold makes a difference how well it runs also, so I'll have the bridge to cross also.
Looks like a good project for those cold winter days when I have alot of time on my hands!

[bigooomp]

i havent actually done any test havent had the time lately buying a rig means run whenever something pops lol. gonzo thanks for clarifyin that and i understand about the room issue and props for workin it out. as for the question about what i dont like about the setup what really is there too like? the location is a pain to get to to tune the backbone airtube is just crazy how in the world is it even helping that long a tube with the box below the seat that room could be used for better things..i want the bike to be clean when im done but special touches add....plus i love the looks of a hypercharger lol and its impossible with the carbs setup as they are.. next chance im home its time to finish tear down hopefully new wiring harness is in