Fuel Hose and linkage Routing for dual carbs, Show me your setup Options

[fin]

Having emptied a fire extinguisher in the engine compartment of a 914 only to hear and see the fire re-ignite, I would recommend to err on the safe side of this issue.

Luckily, the guy that I thought was a jerk when he saw what was going on and sped off, redeemed himself by showing back up five minutes later with a shiny red truck with bright lights, noisy horns and 1500 gallons of water and a herd of friends in all sorts of vehicles.

I LOVE small town volunteer fire departments!

I don't think you can overdo fuel delivery in the engine compartment.

Good Luck,

Fin

[Aaron Cox]

QUOTE (Eddie Williams @ Dec 21 2005, 07:51 PM)

How do I get -6 fuel line to screw onto that? (IMG:http://www.914world.com/bbs2/html/emoticons/huh.gif)

oh... adapters either way...

missed what you were asking.

(IMG:http://www.914world.com/bbs2/html/emoticons/sad.gif)


ever thought about a rising rate regulator?

ie less PSI at idle.... more at 5k....

AA

[Eddie Williams]

The Mallory and the Aeromotive both have vacume ports on them I understand this can be used to lower pressure at idle or increase pressure at boost. I assume at idle manifold pressure is negative in relation to ambient and at boost it is positive. Is this correct?

[Aaron Cox]

QUOTE (Eddie Williams @ Dec 21 2005, 08:48 PM)

The Mallory and the Aeromotive both have vacume ports on them I understand this can be used to lower pressure at idle or increase pressure at boost. I assume at idle manifold pressure is negative in relation to ambient and at boost it is positive. Is this correct?

sounds right...but i dont know (IMG:http://www.914world.com/bbs2/html/emoticons/wink.gif)

[Eddie Williams]

These are a few of the options.Have I left anything out?

[Aaron Cox]

options C D and E are all good imo

[Eddie Williams]

I forgot Brant's option.

[brant]

I'm using option B on the new car.
only B and E have cold/fresh fuel flowing past the carbs.
that will promote the most hp.
It might be miniscule, but I believe in doing everything you can to have fate on your side!

brant

[yeahmag]

I don't see how option B could ever work. There is no resistance for the pressure to build against if it flows straight back to the tank. The regulator would have to be after the carbs... Am I missing something?

-Aaron

[campbellcj]

Maybe it doesn't really matter, but is it a good idea to run the fuel thru one carb and then into the other? Seems like you would get more even flow and pressure splitting the supply line before entering the carbs so each one gets an even supply. That's how mine is setup up. Then again I'm not presently using a return line (I think quite a lot of carbed cars don't, eh?)

[URY914]

QUOTE (campbellcj @ Dec 23 2005, 06:25 PM)

Maybe it doesn't really matter, but is it a good idea to run the fuel thru one carb and then into the other? Seems like you would get more even flow and pressure splitting the supply line before entering the carbs so each one gets an even supply. That's how mine is setup up. Then again I'm not presently using a return line (I think quite a lot of carbed cars don't, eh?)

I agree. My set up T's off of the regulator (one in/ two out) and go to the carbs with a seperate lines and no return. I don't like running to one carb and out to the other.

Does it matter? (IMG:http://www.914world.com/bbs2/html/emoticons/confused24.gif) Don't know.

[Trekkor]

I'm doing the one in, two out thing. No issues.




KT

[Aaron Cox]

cept the hoseclamps (IMG:http://www.914world.com/bbs2/html/emoticons/poke.gif)

[Trekkor]

zoiks (IMG:http://www.914world.com/bbs2/html/emoticons/ohmy.gif)

[Aaron Cox]

QUOTE (trekkor @ Dec 23 2005, 09:21 PM)

zoiks (IMG:http://www.914world.com/bbs2/html/emoticons/ohmy.gif)

just pokin fun....

better than my "hacked up shit" welds (IMG:http://www.914world.com/bbs2/html/emoticons/dry.gif)

[brant]

couple of things...

were not talking fuel injection here.
especially in the -6 with the PMO rails, all the fuel has to do is flow (downhill) into a bowl. The floats shut that off when they are full. No need to distribute it evenly.... just need to keep some in the bowl, and you'll know it if you can't keep that done. Even with 3lbs of fuel pressure there is still plenty of fuel to return to the tank after filling the bowls. (I've got Wideband sheets to show I'm not running my bowls dry.... maybe if it was a 3.6 I would (doubt it), but its pretty effective for me.

the -4 carb doesn't really have a convienient way to go from one to the next and that a part of the reason my plumbing was different when I ran a -4

by having the fuel flow past one carb, it assures circulation and cooler fuel.
having fuel sit above the motor where heat is radiating into it is not a good thing.
in fact as you'll notice in my picture on page 1, we bothered to heat rap our stainless lines every inch of their travel after exiting the firewall. (hot zone)

Modern fuels Suck even as low as at 100 degree's F
fuel injection pressures can mask this.... (and is the reason modern cars don't vapor lock.

but carbs and especially carbs at 5000 ft don't mask it as well. (altitude reduces cooling or air density you know) Most of the SCCA guys in colorado run cool cans on their fuel in the hot engine bays. Check out the mazda guys sometime if you don't believe me.

but heck..
you don't like it thats fine with me.
thats the beauty of free will.

brant

[Eddie Williams]

Either way I think it's a good discussion. My $.02

[machina]

here's my rig, the IDF's need 3lb or less so make sure you get the right low pressure regulator, mine is a return style mallory. The return keeps the fuel cool and prevents perculating when temps go way up.