Fuel screw on an N/a :-)

[8v-of-fury]

 

So I was using search on here and the Tex and i didn't really find what I was looking for. Turning up the fuel screw is effectively allowing the pump to have more fuel at a lesser throttle position from what i understand? Now on Turbo's obviously more fuel is going to be a good thing (to an extent of course) because they have the extra air to burn the fuel. However on an N/a without porting and an adequate intake and exhaust there would not be enough air to burn the fuel completely and thus just create a lot of soot. Correcto?

NOW, I was wondering has anyone really turned up N/a's? like obviously not to stupid amounts but maybe half or one full turn with considerable gains? This is basically what I am looking for when I get the engine in the car. I want for it to be within safe limits as I do not have an EGT gauge, yet still would like to be able to blow SOME black when i stomp it. Also which screw is it on the pump? The one thats like.. kinda above and/or to the side of the fuel solenoid?

thanks guys.

8v

[burn_your_money]

Yeah it sounds like you are describing the correct screw.

Just play with it 1/8th of a turn at a time until you have good power, minimal smoke, good idle and no hanging RPMs

[rabbitman]

I've cranked mine in all the way, for some reason it it didn't make much smoke.

My current pump has the stop pin removed and no LDA so with the screw cranked in all the way it's rather hard on the environment , I had to screw it out some because it feels weird having max power at 1/2 throttle and only smoke after that.

It does help make more power though, if you can make black smoke easy that's fine, just don't do it for very long at a time, and don't lend it out either . If yours is like mine it's an owner only rig, people borrowing 'em don't seem to keep an eye on the gauges or the smoke level.

[8v-of-fury]

what does the "Stop pin" do in the pump exactly and why do you have yours removed? It has an effect on fueling?

I would like probably full fueling at maybe 3/4 to 7/8's. As to only have smoke at and around WOT give or take right? so just turn it up bit by bit, until i get some smoke then it will be safe for EGT's? Common rule is smoke = high EGT right? so no smoke.. no dangerous EGT lol?

I mean im not looking to out "Puff" a Cummins by any means LOL I jsut want to blow some puff balls here or there.. it will make it look TANK lol

[rabbitman]

what does the "Stop pin" do in the pump exactly and why do you have yours removed? It has an effect on fueling?

The stop pin is just a pin that stops the linkage inside the pump, a real TD pump doesn't have the pin, instead the LDA has a finger that takes the place of the pin in the pump. It moves ahead as boost comes up and when there's no boost it moves back so you can't push too much fuel in without boost.
So the LDA is just a movable throttle stop is all and to turn a NA pump into a TD pump the pin has to be cut off/removed.

Yeah full "useable" fuel at 3/4-7/8 does mean you'll get smoke by full, it'll be a waste though. Just don't hold it down very long.

Better yet, get an EGT gauge, very handy for keeping it cool.

[8v-of-fury]

Ed (Smokey Eddy) bought one from the "man who shalt not be named" but it starts reading at like 6-700F. The low readings are important too! Well maybe not so much because it isn't turbo'd so i don't have to worry about oil going bad up in the turbo eh?

 If I were to run an oil cooler..... Would that help with EGT's? The cooler the oil the more heat it can take on and the more heat it can get rid of via the cooler right? Combine that, with a free flowing intake and exhaust setup. I should be able to keep EGT's in a safe level whilst fueling a little bit, what do you think? i plan on 2-2.25" from manifold back and a glass pack to a side dump.. I was thinking of ways to make the N/a exhaust better while maintaining the stock manifold.. and it appears the actual inner diameter of the manifold is around 2.5" so you take the toilet bowl exhaust down pipe and lob it off and make the hole bigger to accommodate a 2.25 pipe and voila a good free flowing exhaust.. N/a Intake and Exhaust manifolds are actually really good designs for the amount of air they can flow