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monster

  • Karma: +0/-0
dual carb fuel????
« on: August 10, 2009, 03:28:43 pm »
Ok so I've been having issues with the bbc 454 running toooo rich, couldn't get the floats to set right, lots of carbon build up. Then today I'm looking on line for rebuild kits to give the carbs a fresh start ;D, and I noticed something very different about my Holley 1850 600cfm carbs--- they have two fuel inlets, so I keep looking on line and everyone else is running them with single inlets..... My question is has anyone seen this before??? and might this be causing my high rpm bogging???? feels like the motor is flooding at WOT... here's some pix... go back to single inlet and a fresh rebuild kit or????
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Sanger Pete

  • Karma: +3/-0
Re: dual carb fuel????
« Reply #1 on: August 10, 2009, 04:15:25 pm »
I had the same set up on a 20' mini cruiser, except with only 1 fuel feed per carb. I am no carb expert, but can't imagine why you would get flooded out at full throttle but not at cruising speed or idle. Do you have a mechanical or electric fuel pump? How about a fuel pressure guage? Although, the TR looks good, when I replaced mine with a single carb performer intake and an 850 holley, I gained 200-300 rpms and top speed, and improved fuel economy by about 20%.
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lbhsbz

  • Karma: +29/-1
Re: dual carb fuel????
« Reply #2 on: August 10, 2009, 04:18:06 pm »
Funny, I was looking at mine last weekend contemplating doing the same thing...but I was kinda drunk so I decided against it.

Looks liike someone just drilled out the bowl, tapped it for 1/4" pipe threads and screwed a nipple in there.  That is not stock.  They even left the stock transfer tubes in there.  That shouldn't affect the rebuild...they just have a couple extra holes in 'em.  Make sure that the needle valve actually closes off that new fuel inlet though...I dunno how thick the bowl casting is right there, they might have drilled through so fuel flow is bypassing the needle valve, thus...your problem.

 
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monster

  • Karma: +0/-0
Re: dual carb fuel????
« Reply #3 on: August 10, 2009, 04:36:18 pm »
The fuel pump is a Holley blue electric. pressure is set at 8psi which by reading info on the Holley web site is too high they it should be at 6psi. I just order the rebuild kits today. I'm gonna try blocking off the second port, lowering the fuel pressure down to six (I think the pressure was holding the needle valves wide open)... I'm very stumped about the bogging at WOT, its only the last 10-15% of throttle it bogs like its flooding, i know its running real rich the plugs are black and the pipes have a lot of black soot. Don't have a clue as to it idling good and it runs like a bat outta hell till it hits WOT then it bogs out and I have to back out of it.... Gps at 66mph rite before the bog :banghead: :banghead: 
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