Which setup? there are quite a few mentioned? If you are refering to the one I am taking about, I can get some pics of nozzles in a Q-Jet since my bud has his Fogger setup on a bench. I can grab 2 nozzles and get a pic of them in a Q-jet for ya. The rest would be a straight forward install for a nitrous setup. It would be Sat or Sunday before I could get it.
the nitrus in the qjet is what i was refering to. it would be awsome if you could get some pics of it. also i dont quite understand what you were talking about with the low pressure jets? are you saying that you run the gas jet off of the mech fuel pump on the engine?
Generally when you only use 2 nozzles it is for a EFI spraying into a Throttle body using 37psi. You'll need jets that are sized for a non-EFI setup that works off 5-6.5 psi. You wont be able to use a stock fuel pump by itself but it wouldn't take much for a small shot. A small pump in-line "T"'d off the stock feed line to run the nitrous would work. OR MSD now makes a cheep EFI in line pump that you could use for just the nitrous.
Not likely. I ran a Stg 1 pump and it drop to 3.5 psi at WOT with a 450 hp motor. It kept fuel in the carb but wouldn't run nitrous. You need to be able to hold, at minimum, 5.5psi with the nitrous spraying. An idea would be to "T" off the stock carb feed at the outlet of the fuel pump and run it to a Holley Blue or Red, then to the fuel solenoid of the nitrous. OR you could keep EFI jets for the nitrous fuel jetting and run the new MSD in-line EFI pump ($139)instead of a Holley Blue or Red pump.:TU:
Ouch! The distribution looks horrible with that setup. Has it ever been run on a motor? Are there more nozzles near the primaries? -Bob C.
Ouch, don't be so mean.:spank: The primarys feed a hole 10cfm, whats the point? Not to mention, it's a Q-jet with huge secondary's and itty-bitty primary's, I don't see you complaining about that. With this setup your only talking about a small amount of nitrous (under 200HP) anyways so there shouldn't be a problem. Have you burned up anything from distribution problems? You did say it "Looked" horrible, not that it actually is horrible. If you want to look at other setups that spary more and have a WAY worse "distribution", then look at the wet systems that spray thru the thottle bodies on LS1's and Mustangs. The fuel has to float uphill to make it up the runners, not to mention it spray's in the front and has to make it all the way to the back of the intake.:shock: I do agree that distribution needs to be as good as possible to work best and to avoid problems but its all relative. THe majority of the fuel and air is thru the secondaries and the nozzles are angled toward the buttley fly. With the velocity in a factory dual plane and the fact that it isn't an open plenium, you should avoid most distribution problems. I feel that there is just as much of a problem with single planes that have large volumes of nitrous flowing thru bars that blows the fuel from the carb away from the runners like on a TA. BUT with that being said, there are Chicago guys that have been doing it that way for years so who's to say it doesn't work? It's all just trying to be logical with it, only to over-think/engineer it for a problem that may or may not be there. I would say there is more of a HP limit with this setup over there being a "problem". I couldn't say what it is. Every combination will be different. o No: I eventually plan to use it on our 350 car and will let you know then. I see no reason why it shouldn't work or I wouldn't have suggested it. It is FAR cheeper to go this route over buying a dual plane intake and running a plate that will mess up a snorkle setup. OR buying a direct port (Fogger), pulling the intake, and all the plumbing that goes with it. OR messing with that "Top Shot" that I feel will mess with the carb signal and/or the secondary top butteyflies, plus has to be plumbed thru the aircleaner. This would be a very clean a simple setup. :TU:
Sorry! Not trying to be mean. If it works then it works. I agree that there are lots of problems with the other setups you mention, but this still does not look like the flows will be symmetrical. I have burned up a couple of engines (none recently, knock on wood) so I've tried to "over-think" my setup, and that one just doesn't look like you'll get even results (especially on a dual-plane intake where you have one liquid coming in a 7 PSI and another coming in at 900). You can probably get an even overall mixture going into the engine with that setup, but it only takes one lean cylinder to ruin your day. And for the record, you are correct that I'm not a fan of spreadbore carbs in nitrous applications or dual-plane manifolds (I love them both for non-nitrous, BTW), unless you go to individual injection in every intake port. There are problems with every setup I suppose, but I wouldn't run that on a motor that I cared about. No offense or nothin! -Bob C.
