Racintweek

a lot of Old school VW guys run side draughts. some 40's would do nice on a LS.
you can run absolutely massive cams on carbs.

Carnesd

to run a carb with a high pressure pump you just loop the feed and return fuel lines, and then T into it and restrict the return line just enough to get the sort of pressure the carb needs.

and for not using vtec, the reason they do that is because if its a race engine, theres really no need for vtec, because if your always in high rpm, vtec will always be activated therefore its the same as having a higher lobe cam.

so they use the higher flowing vtec head instead of having to work over a non-vtec head to the same performance

jinxy

some individual carbs have little vaccume fuel pumps on the unit itself and dont need a fuel pump they could use the stock ecu for spark if it doesnt cel to death

nitrogen

motorcycles carbs have float bowls, i'm asuming if he's running ind carbs that they are something off an inline 4
motorcycle, if the fuel level is too high in the float bowl, it causes a rich condition. Carb'd bikes run off gravity
feed and vacuum, depending on the petcock, and have a float valve that stops the fuel from coming in, i just
dont see how it could work under psi. (i'm sure there is a way though)

jinxy

not all carbed motorcycles are gravity feed some have little fuel pumps that look like a remote water pump or somthing. it wouldent be to hard to do somthing to get fuel to the carbs. and usualy if the fuel level is to high in the float bowl it drains out a vent tube and its not an issue other than there being gasoline running out of the vents on the carbs and getting everywhere.

FooK

keep in mind that generally carbs are harder to control and tune...which is why fuel injection is so much more common and just all around better.

jinxy

word. i couldent immagine trying to start a 1800cc individualy carbed engine in the winter. plus carbs have allot of lag in them and there not smooth. expecialy larger carbs. the engine will feel like it has nothing at all then suddenly its ***** out. sucks *** realy. with fuel injectors you can tune around that so it runs decent and its driveable. although carbs would be ok for racing if you get pissed off at efi systems or somthing.

nitrogen

when there is more fuel in the float bowl there is more fuel going out of the circuits into the engine. duh.
sure it will overflow and drain when the bike is off, but what is it doing when the bike is running? This is
why there is a spec for carb float height. I thought you worked in a shop? Know of any bikes off the top of
your head with that pump?, i haven't seen one my whole time in school, must be a pretty rare deal?

87na_rx7

no tps, map, iat, iacv, injectos.... i dont think any ecu would like that. it would be in limp mode definatly

jinxy

wetbikes. :P and if its a mikuni carb and the floats off and the needle is letting to much fuel in usualy it runs straight out of the vent tube. ive done it a few times putting the caps back on. it kinda depends on how the carb is set up. ive had some run straight out and some will just make the engine run fat as hell.