theNeanderthol

iTrader: (1)

Well Error402 I have a strange idea similar to yours It is a crazy idea that just might work I will create a separate thread for it later today.

error402

peejay & jeremy - Wouldn't getting a larger fuel pump push a consistent amount of extra gas then a regular pump? The idea to have a "eco" and "race" setup. That you can switch from when ever you feel like. I dunno, maybe it was just a stupid idea. It all seemed right in me head.

theNeanderthol - Sweet! PM me when you get it started I'm interested in seeing what your idea is.

peejay

I think you do no understand how the fuel system works. The fuel pump will always try to deliver a set volume of fuel to the carb. The fuel pressure regulator will restrict that flow so that the carb doesn't get too much fuel. There is no need for a dual-stage fuel pump, and in fact it would probably be detrimental (excess heating of the gasoline, the smaller pump would act like a restriction, etc)

Just get a big enough fuel pump to do the job and a decent regulator and that's all you need to worry about.

error402

I know I don't know too much about the fuel system. I know enough to be dangerous. Where is the regulator located at? What about bypassing it?

I still a similiar setup can work. I'll have to do some more research. My idea in it's current state is a bit rough. :Shrugs:

riffraff

if you have the stock fuel pump on there, then you donot have a regulator.. that is something that you should add when you upgrade your fuel pump

peejay

Why would you want to BYPASS it? You need it so you don't overpressure the carb. The carb requires a certain fuel pressure to work properly. You need a large enough fuel pump that can supply the needed volume without losing pressure. The regulator ensures that fuel pressure never goes too high.

FWIW the stock fuel system does have a regulator, it's built in to the fuel pump.

error402

okay there has to be a way to get more fuel to engine, right? by either enlarging the fuel openings at the carb, larger fuel pump, etc...etc...etc... where does the regulator step in then? or does the regulator get upgraded with the fuel pump? what happens if the pressure is too high in the carb or too low?

riffraff

the regulator stops the pressure from getting to high.. it is inline, from the pump to the carb.

peejay

Keep in mind that adding more fuel does not make more power. Adding more air makes more power. The carb is there to make sure the proper amount of fuel is mixed with the air. Not enough, you're down on power. Too much, you're down on power. Just right, and you're haulin' ***.

Generally speaking the stock carb is too rich esp. at the top end, on a stock engine. Once you start modifing you throw everything out the window and you have to start tuning... for tuning info the best place to start is personal.riverusers.com/~yawpower

error402

I agree with you jeejay. Adding just more fuel doesn't add more power, (it would be nice if it were true ) but wouldn't too much air produce the same effects of having too much fuel? Isn't that why we try to tune the carb to have a perfect mix of air and fuel? So, if you increase the air you would have to increase the fuel to keep the balance in order of the two elements, correct?

peejay

Exactly right. However, you do the tuning with carb tuning. The fuel pump is only there to supply enough fuel to the carb, it doesn't determine air/fuel ratio unless it's too small and starves the carb of fuel.

What you do is get a fuel pump that is large enough to keep the carb well-fed under ALL conditions. (A little larger, actually, just to be sure) You don't have to worry about it being "too much fuel pump" under idle ot low-load conditions, because the regulator ensures that the carb never gets overpressured. There would be no point whatsoever in having a small fuel pump and an auxiliary fuel pump. (In fact, the smaller fuel pump might act as a restriction and hurt flow)

error402

Okay sounds good. Will a larger fuel pump give you worse gas mileage? or is the carb regulating that?

jeremy

iTrader: (1)

carb and your right foot regulate that. gas and fuel make power. more gas plus more fuel makes more power. since gas equals $$$, especially right now for some reason, going fast equals $$$$$$ and constantly instead of a one time thing like parts. that is one of the reasons i respect honda as a company (not the ricers). they manage to pull out great horsepower/liter in their designs. so the design is the only factor that can beat the more mixture/more power norm. getting your engines internals ceramic coated will raise power by raising efficiency. same amount of mixture equals more power. but i'm not sure how much it would cost for that. ok, i'm bored at work so just laugh at my information ramblings.