Fuel Injection

[DualCarb]

so single carby (which i think i have) is not as powerful as dual carby?

nope, dual carbs add about 15HP to every motor of the same displacement over the single carb

[michael_antoi]

On a single carb motor, you can flip the lid of the airbox, to let in air from 360 degrees, as opposed to one direction only as with the air inlet pipe. This is also more effective if you drop in a performance filter like K&N designed to replace your stock filter. You can also ask a carb expert to open you second downdraught barrel permanently, more power throughout the range. The second throat only opens at a certain RPM, for high end power. Opening it permanently gives you low end gains too. You can also have it rejetted for slightly more fuel...

not sure how flipping the lid would let air in from 360 degrees...care to explain?

[DualCarb]

not sure how flipping the lid would let air in from 360 degrees...care to explain?

The lid on top of your airbox... turn it upside down, so that it does not seal around the lip of the airbox, but has a gap open right around, letting air in from 360 degrees around the airbox, and not just from the intake pipe... then tie the lid down again with the wingnut you normally tighten it with. Dont just slam your hood down to close, some models have different clearance between the hood and the airbox...

If you have problems closing your hood, replace the lid with another plate that you cut to size and shape with the air filter...

[SiR JDM]

Michael, the 94 breeze is a dual carbi... its the 1.5 litre d15 engine rite?

[michael_antoi]

i know it's a 1.5 carby of some sort...

not sure if it's d15....

[DualCarb]

i know it's a 1.5 carby of some sort...

not sure if it's d15....

is you airbox mounted horizontally under your hood, or is it mounted vertically (upright) next to the firewall at the back of the engine compartment? And it is a D15...

[michael_antoi]

horizontally...

i just checked. it's not possible to flip it coz it wont screw back on....

it wouldn't be a good idea to remove that lid altogether would it?

[DualCarb]

horizontally...

i just checked. it's not possible to flip it coz it wont screw back on....

it wouldn't be a good idea to remove that lid altogether would it?

OK, then you do the old ford trick... you take out the filter, put it on another flat metal/plastic plate, trace the outline of it with a marker, cut out the metal along the line you traced, drill a hole for the wingnut bolt, put your filter back in the airbox, and tighten it down with the new plate on top of the filter...

[michael_antoi]

wouldn't the airflow still be pretty much the same since i'm still sealing the sides with the new metal lid?

[DualCarb]

wouldn't the airflow still be pretty much the same since i'm still sealing the sides with the new metal lid?

No, you will only be sealing the top of the filter over the carb throat, not the actual filtration side where the paper is... that would be exposed to open air, which can now suck in air from right around the exposed sides... when you trace the filter, you trace it while lying FLAT on the metal plate, with the papaer filtration exposed on the sides. Since the new plate will not make contact with the lip of the airbox, the filtration side will be open to the athmosphere...

[michael_antoi]

ahh that's right, ok might give that a try....

would i have to use metal?

would wood be fine?

so how much of an increase would i get if i did that and also a chrome pipe with and air filter attached?

[DualCarb]

ahh that's right, ok might give that a try....

would i have to use metal?

would wood be fine?

so how much of an increase would i get if i did that and also a chrome pipe with and air filter attached?

lol, some guys have used wood, but thats a bit ghetto mate... metal or sturdy plastic plate that you can paint nicely and will be strong enough to withstand the wingnut and the heat will be great. carbs dont work like FI, so a pod filter and chrome pipe will not work as well as a carb breathing from 360 degrees..

http://hondaconcerto.narod.ru/Tuning.html

this site is in russian, about honda concerto's but there is a pick there explaining how carbs are tuned to breathe better