So I am in the process of putting the KB/B1 500 back into the Demon after giving up on shoehorning the mega/440-1 540 in. I had the motor detuned with 10-1 pistons and a smallish 260's cam, and since the Vortech V7-YSi wouldn't work (per Steve Morris), and so to get some power I put the fogger sys back on. I am thinking 600's in HP on nuts and will start with a 250 HP tune on the naws. This is a street/strip toy and the 1/8 mi track is 5 miles from my shop to the pits, and I will help fill the KOS field with it twice a year at Radialfest and Friday night TnTs. Pump gas.

Car will need a different fuel tank/pump setup but first I am plumbing the motor in and can run it on the BG400 that is there. There is an existing AN-8 main fuel line that will supply both the carb and the NOS fuel. Per Monte I will use one 4 port BG reg for the carbs with AN-6 lines and if I drill a hole through the motor plate I can "pass thru" a line to the NOS 4 port BG regulator. To feed that second regulator an AN-6 will fit perfectly with 90* at each end. The NOS fogger has 2 banks fed with AN-4 lines.

What kind of HP (motor and NOS) will the AN-8 main line support feeding both systems? Does this need to be AN-10? Is the AN-6 adequate to feed the fogger regulator and what HP will that limit it to? The skinny steel Molnar rods are probably the limiting factor anyways, so I have 250 HP jets in now with 350 jets to try if that isn't enough.

Do I need a return line? Where should it come from? I thought the back side of the 2nd regulator, the one that control the NOS fuel, would be a good spot but is kinda tight on this motor for interfering with other stuff. What are the pro's and cons of deadheading vs a return line? I think Mike had the AN-3 return plumbed into the regulated side of the carb regulator

I am thinking that the new tank should have progressive fuel pumps, ie two or three that come on in stages as RPM is increased or the NOS gets activated. That to keep the gas from getting hot. Is there a better way to do that?

I don't think on a halfway fast drag car that the fuel temps. are a real problem, it doesn't take 1.0 second at WOT to drain both fuel bowls so fresh cooler fuel is going through the carb right away That plus as the gas is atomized it absorbs some heat out of the intake manifold also If you can run E85 or straight alcholol all your worrys are over As far as how much fuel volume you need and how many fuel pumps bigger is better, I put a Magnafuel 500 pump on my new car with a #10 AN line to the regulator, #12 to the pump from the cell. It may make 1000+ HP on gasoline, maybe less It will be a 555 C.I. Koleno block with a set of B1-MC heads and multiple carbs.

That's nothing like I advised to do.........so don't drag me into that..........LOL!!!

That one BG400 should easily feed the motor and the nitrous. It should have a return line right off of it to go back to the tank. I'd use a -10 feed and connect your two regulators w/ a -10 also if possible, or whatever size ORB fitting it has on the regulator. Keep em close together for a cleaner look. Run -6 lines to the bowls and to the solenoids.

It sounds like you neutered the motor that was in the car when you bought it. It was a proven fast ride...why change it so drastically when it seems like what you're wanting to do w/ the car, was exactly what it was set up to do before?

Huh? The first reg will have a line on the other side from the inlet that will go to the NOS regulator. Is AN-6 large enough to feed the NOS regulator which has 2 AN-4 lines to the solenoids?

I thought I laid it out pretty clearly. Guess not. No, I would use something larger than -6 to connect the 2 regulators. If the ports you're connecting are -10 orb, then that's the size I'd use. I've never had any of those BG regulators (always heard they were junk), so I don't know what size the ports are.
I'd rather see -6 lines to the solenoids (the industry standard), but -4 may be fine.

You are making something that is very simple into something difficult. For one, you do NOT need to use a 4 port BG for a nitrous regulator. That's a waste, plus they are not repeatable at low flow and pressure.

You asked about a log, you don't NEED a log. That 4 port has a rear port that is flow through, meaning it sees pump pressure. It's probably a 10 or 12 o-ring thread. So you buy an adapter that is 10 or 12 o-ring on one side and 8an on the other and screw it into back of reg. Now you have an 8an port. Then get a bent 90* female to female 8an 90* fitting and screw it on with the bend pointing up. Put a 3/8 pipe to 8an adapter in the bottom of a 803 Holley reg and screw that to open end of 90* fitting. Now the nitrous reg is mounted directly to carb reg, is seeing pump pressure and is your dead head nitrous reg. It's mounted, ready to go and you need no log. Most run 6an to fuel solenoids but 4an is fine. I would run a 12 from cell to pump and 10 to front and into carb reg

That motor is liable to be a turd with low compression and a small cam. Not sure why he did that either. Also if the 500 came out, the 540 would go right in, not not sure what the couldn't "shoehorn" that in there comment means. This car has taken about 6 different directions since he bought and it sounds like he is still not sure what he wants to do.

First he wanted a Pro-Charger motor with blow through and bought a setup. Then he wanted EFI. Got mad at me, because I refused to wire EFI into his 40 year old stock wiring harness and said I would only do it with a total car rewire. Then a 540 with Pro-Charger.......seems a Vortech was in the mix and now back to a nitrous motor, which it was when he bought it. So I can't keep up...........LOL!!!!

No Monte... I was gonna put a blower on the 500 after changing the rotating parts and first wanted to EFI it which would fit the hood better, but I didn't want to spend $20K going that route with you including the wiring. I found a whole Vortech blowthrough system for 1/4th of that including a custom E-85 blowthrough Dominator. That is why the CR is 10-1 as it was the lowest I could get it with 47cc heads. When I tried to get a cam for it, Steve Morris said that the Vortech / 500", 10-1 CR was a mismatched combo and the blower would be off schedule. Strange cause the guy I bought it from had a 9-1 500 and I watched him run it at Sand Mountain. He was on E-85 though which was what I was going to run. That heavy 3800# car went 6.14 with it. Another issue is the manifold on the 500 is pretty tall and that huge hat on a blow through Dominator would not fit under the hood. So the heck with that and I tried to put the 540 in instead while we went through the 500.

That 540 has always been 14-1 and never was gonna get a blower. That motor was put together for another Demon I have that was to be track only, before I got the KOS Demon. I couldn't get the Proparts headers I bought to fit in the KOS car on the raised port 540 without denting them (problem was the motor plate I had raised the motor 1/2" and that caused a fenderwell pipe to hit the snout bar, pipes interfered with the torsion bars so I put on coil overs). So, to get the car back to running I decided to just put the 500 back in with no blower after it came back. At least the headers for it fit. The cam is small cause the CR is low and I want to street drive it around here on pump gas. BTW, I picked it, not Dennis.

The fogger was already in inventory and I thought it may help on the track so it went back on. All the NOS stuff has been taken off the car and will have to go back on. I really do not like NOS as I am kinda spooked by it - it blew this car up once already and I had it go off in my face when I was test flowing it after I bot the car. I will be reluctant to use it and probably only once the car is in 2nd gear.

The NOS reg is on a bracket on the intake in front of the carb, away from the carb reg which is on the motor plate. I need to buy the fittings and hose for the line between the regs and using AN-6 definitely will fit nicely. AN-4 lines were what was on the fogger fuel side. The car has I believe AN-8 from the pump now. They had a separate tank, pump, line to the NOS side. It will use a single line now and does that needs to be AN-10 to support both systems?

The 4 port regs were also what was on the car so I have them already, no waste. I could change the 4 port NOS reg to one of those Holleys as I have several of them too, if the 4 port BG is unsuitable as a NOS reg. That would be too bad though as this setup I have already mocked up is pretty clean. The line between the regs will go through a hole in the motor plate from the rear side of the reg through a 90*, line in front of the head, past the distributor and right to the other reg with a 90*.