I searched this but there was no clear cut awnswer. On a dp 4 noid set up I want to know what a 4 an line is good to on both the fuel(55psi) and n2o(950psi) side. Would it be ok on a 300-325 shot or would i need 6an lines.

 

How long were the lines going to be that has a lot to do with how much they will support

 

Well main feed line is between 16'-20' for n20 plus the maby 1 foot to each noid then probably just a few feet for the fuel but lets say 5 feet cause that the lenght you get with a dedicated fuel cell

 

4AN are supposed to be good for 400rwhp +/- a hair. However, I will go with a new 6AN Triple Black Insulated hose when I redo my setup. Currently running the 4AN TBI.

 

At that fuel pressure, I think -4AN would be fine on the fuel side.

For nitrous, I would really step up to -6. I've personally seen good gains from swapping to -4 to -6 at even 200-250 power levels.

 

Yeah at that length the -4 will be a restriction. Not sure where the 40hp thing on -4 started but anything over 250-300 should use a -6. This is assumeing the stantard feed line length of 12-14' and up. On the fuel side at that pressure you should be fine but going bigger wouldn't hurt either and would allow you to go bigger in the future. If Ihad to buy all the parts from scratch I would go with -6 all the way around.

 

I'm runing a 6A line but I have 2 bottles hook't up

 

I stepped up from a -4AN to -6AN this past weekend and burnt stuff. Same exact everything, except line. ?? I tried going 10psi highier on fuel side half step colder plug, and tried taking ALOT more timing. Nothing seemed to help. Head gasket finally blew.

I'm gonna stick it out with the bigger line, but just a few words of wisdom.

 

How much nitrous were you running?

 

Well, lets see, in the past few years, there have been quite a few ppl pushing 350+ shots on 4AN line, and most considered the max capacity to be 400. Me personally, I'll step mine up 6AN just to avoid having to do it all over again later anyway. But for guys staying below 300, 4AN should be more than enough.

 

Started at 200 ramped to 350 within 5 seconds.

My -4AN did supply well at the 310 power level, but MPH seemed to drop off or stay the same at anything more than 310. ??

I'm not saying -4AN will not work with more than 310, just saying for ME it did not seem to work; and the switch to -6AN seemed to have made a deifference, but I was not ready or well equipped for the change.

 

Any advantages for a 6an vs a 4an on smaller shots?

 

yes. its all about keeping the n2o from changing "phases"

 

Care to explain...

 

The 400hp on a 4an is under ideal conditions, meaning, an absolute straight shot and no 90*'s or other restrictions like teeing to dual noid set-ups. On this set-up above I would opt for the 6an if you can.
Robert

 

Phase, liquid to gas...As it enters the solenoid, enters and exits unions, etc there is some changing of phases from liquid to gas. Ultimately you want the solenoids as close to the POE (point of entry) as possible, since it will change going thru the noid, and finally as it exits the jet/nozzle it finalizes into a gas. The longer it remains liquid the more efficient the system will be (hits harder with same jets etc, and should in theory use less nitrous to do the same power, but its mostly immeasurable difference). In using 6 over 4 an line when your only spraying say a 150shot, you will have nitrous changing from liquid to gas inside the line. Now I could be totally off key on all this, but this is how I can best describe it.

 

thats definently interesting...ive always heard "bigger line harder hit" but its nice to have something better explained

 

But at what length? The longer the line the more the restrictive it will be