Tunnel Ram and fuel slosh issues ?
#1879282
07/27/15 04:10 PM
07/27/15 04:10 PM
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Joined: Jan 2003
Posts: 3,026 A shed in England
Tig
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OP
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Joined: Jan 2003
Posts: 3,026
A shed in England
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We've been chasing a weird bog that seems to effect the car 60ft or so out. Motor goes real lean and dies / noses over then comes back. Anybody use these? http://www.quickfueltechnology.com/fuel-bowl-parts/nitrophyl-float-wedge-primary.htmlSeems to make sense for the above issue. I think we have / had other fueling issues as well.
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials. 9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge. RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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Re: Tunnel Ram and fuel slosh issues ?
[Re: Tig]
#1879355
07/27/15 05:05 PM
07/27/15 05:05 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Are the carbs mounted front to back.. or sideways.. I had mine on sideways and had a problem of that nature... being that the jets are in a different place I made up some 90* jet extensions that fixed it... I kept them right on the bottom of the bowl to clear the float.... I did all the jets that way... not just the rears
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Re: Tunnel Ram and fuel slosh issues ?
[Re: Tig]
#1879625
07/27/15 10:41 PM
07/27/15 10:41 PM
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Joined: Jan 2003
Posts: 19,687 Las Vegas
Al_Alguire
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 19,687
Las Vegas
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You need the correct floats. They are oriented right and left as well as the carbs need to be mounted front and rear and the orientation does matter. Pretty typical for a hard leaving or wheel standing car with sideways mounted carbs. Surprised they were not in there if they were ordered for a tunnel ram deal. FWIW those floats are made by Braswell for Quickfuel as are many of their parts.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: Tunnel Ram and fuel slosh issues ?
[Re: Biginchmopar]
#1882279
07/31/15 02:38 PM
07/31/15 02:38 PM
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Joined: Jan 2003
Posts: 3,026 A shed in England
Tig
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From my experience with the sideways carbs I bought the floats from Pro Systems but a lot of carb manufactures have them. The ones you show should have a left and a right taper towards the back of the car. Once you have the correct floats and have them set correctly I'll bet a million dollars it needs bigger shot of fuel at the hit. Small tube nozzle type squirters (31's) with a bigger cam (Squirter cam). Are you leaving wit your foot on the floor or partly down then full throttle? Hi, I've ordered the wedge floats from quick fuel, we have already "upped" the squirters to .063, these are 1150 dominator carbs, yellow cam only 2 pos'n. We've also upgraded the fuel lines to one size bigger everywhere. We're not back out with the car until the end of August. Footbrake, Launch around 1800rpm.
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials. 9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge. RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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Re: Tunnel Ram and fuel slosh issues ?
[Re: Tig]
#1882360
07/31/15 04:27 PM
07/31/15 04:27 PM
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Joined: Dec 2012
Posts: 1,824 Wind Gap,Pa.
Sammy
top fuel
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top fuel
Joined: Dec 2012
Posts: 1,824
Wind Gap,Pa.
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From my experience with the sideways carbs I bought the floats from Pro Systems but a lot of carb manufactures have them. The ones you show should have a left and a right taper towards the back of the car. Once you have the correct floats and have them set correctly I'll bet a million dollars it needs bigger shot of fuel at the hit. Small tube nozzle type squirters (31's) with a bigger cam (Squirter cam). Are you leaving wit your foot on the floor or partly down then full throttle? Hi, I've ordered the wedge floats from quick fuel, we have already "upped" the squirters to .063, these are 1150 dominator carbs, yellow cam only 2 pos'n. We've also upgraded the fuel lines to one size bigger everywhere. We're not back out with the car until the end of August. Footbrake, Launch around 1800rpm. When this doesn't solve your problem, refer to my post. Been there done that. Your carbs ,if they are the sideways mounted carbs from the factory already have the correct floats in them already.
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Re: Tunnel Ram and fuel slosh issues ?
[Re: Tig]
#1882397
07/31/15 05:29 PM
07/31/15 05:29 PM
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Joined: Jan 2003
Posts: 3,026 A shed in England
Tig
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Sammy, the car goes lean on the AFR's. If the fuel was dumping into the carb from the vents I would expect it to go rich. However sometimes stuff doesn't work out how you think so we also done the vent tube thing, still had the issue. I'm thinking we've had a number of fuel related problems, those being at least: fuel line to small, more squirter needed and this "fuel in bowl control" issue. Todd, I have a bunch of pretty pictures I can send, here's another one.
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials. 9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge. RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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Re: Tunnel Ram and fuel slosh issues ?
[Re: Tig]
#1882429
07/31/15 06:36 PM
07/31/15 06:36 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Master
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Posts: 52,972
Romeo MI
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I doubt that the fuel line is too small if its falling on its face right off the line and being that you foot brake at 3800 rpm.. also if those are 1100 carbs I doubt the needle and seats are too small(most likely .130)
Last edited by MR_P_BODY; 07/31/15 06:38 PM.
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Re: Tunnel Ram and fuel slosh issues ?
[Re: Tig]
#1882738
08/01/15 07:12 AM
08/01/15 07:12 AM
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Joined: Jan 2003
Posts: 3,026 A shed in England
Tig
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It isn't falling on it's face off the hit, it's usually 40 - 60 ft out. We log the AFRs (left and right), you can see the lean spikes, sometime right where the converter stalls, sometimes .3 -.4 seconds later. Also we have seen a double lean spike, like the fuel moved away from the jets, then returned when it stumbled and then did it again. Were running a Magnafuel 500 fuel pump and now have -8's to the carb, -12 main feed to reg, and 2 -10's from the the tank to the pump. Changing the lines from -6 to -8 on the carbs helped we came down 2 sizes on the main jets as it was too rich after that. AFR's also go richer towards the end of each gear change, typical 3rd gear might start at 13.1 and end at 11.9. I didn't know the 4150 pump cams would work with a 4500 carb, or do they have to be modified. Thanks for the answers so far
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials. 9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge. RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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Re: Tunnel Ram and fuel slosh issues ?
[Re: Tig]
#1882750
08/01/15 08:45 AM
08/01/15 08:45 AM
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Joined: Dec 2014
Posts: 304 Florida
Mark Whitener
enthusiast
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enthusiast
Joined: Dec 2014
Posts: 304
Florida
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When you put the floats in, wedge to the rear, turn the bowl upside down, measure the distance between the top of the float and inside top of the bowl. Set the float level to .425. Make sure fuel pressure isn't over 6 psi.
Mark Whitener [url=www.racingfuelsystems.com[/url]
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Re: Tunnel Ram and fuel slosh issues ?
[Re: Mark Whitener]
#1894572
08/18/15 04:33 PM
08/18/15 04:33 PM
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Joined: Jan 2003
Posts: 3,026 A shed in England
Tig
OP
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OP
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Joined: Jan 2003
Posts: 3,026
A shed in England
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When you put the floats in, wedge to the rear, turn the bowl upside down, measure the distance between the top of the float and inside top of the bowl. Set the float level to .425. Make sure fuel pressure isn't over 6 psi. Done, done and done, just need to get down the track now
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials. 9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge. RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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