Tunnel ram carb question
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Tunnel ram carb question

  1. #1
    Boat Nut sleekcrafter's Avatar
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    Default Tunnel ram carb question

    I have twin dominators, with a Victor Ram on my 540

    I find it like lots of fuel to lite off, throttle is snappy and all, but little difficulty in starting, and black smoke out the right header, on the hit. I have soft progresive cams in for the secondaries. I'm thinking I may need to switch to progressive cams?? This will get fuel to the left cylinder banks on start-up, and reduce the smoke on the right side. Am I sorting this out right?
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    Senior Member EVILFORCE's Avatar
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    I would look at fuel leaks in the carb. Could be boiling over after shut down or just leak fuel from a float level problem. If it is flooding like that keep a eye on the oil. I don't know.
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    You can use the spring tension on the accelerator pump arm to make some adjustment. On my doms, I increased the "lash" to reduce the amount of pump shot off Idle. It cleaned it up.This was on a blower set up.

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    Senior Member IRRebel's Avatar
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    These are exactly the reasons why I despise sideways mounting. Even on a Blower. Besides what you are experiencing, how's the plugs read, bank to bank?

    Ray
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    gn7
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    Quote Originally Posted by IRRebel View Post
    These are exactly the reasons why I despise sideways mounting. Even on a Blower. Besides what you are experiencing, how's the plugs read, bank to bank?

    Ray
    Really! Amazing the number of people running Doms on a blower and don't experience any problems. So when running 4150s on a tunnel ram inline, at part throttle, using you theory, shouldn't the cylinders 1, 2, 5 and 6 run differently than 3, 4, 7, and 8?



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    I have thought about this too and have come to the following conclusion...

    Orientation of the carburetors doesn't matter because the only way for the air and fuel to get into the plenum is through the opened butterfly... no matter where it is.
    Last edited by XClutchboy725; 06-01-2011 at 03:44 PM.

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    Senior Member bp298's Avatar
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    Quote Originally Posted by sleekcrafter View Post
    I have twin dominators, with a Victor Ram on my 540

    I find it like lots of fuel to lite off, throttle is snappy and all, but little difficulty in starting, and black smoke out the right header, on the hit. I have soft progresive cams in for the secondaries. I'm thinking I may need to switch to progressive cams?? This will get fuel to the left cylinder banks on start-up, and reduce the smoke on the right side. Am I sorting this out right?
    you say "on the hit"? is that full throttle or part throttle? if it's part throttle, what does it do with a full throttle hit from idle? do you have the same size squirter nozzles all the way around? are the accel pumps exactly the same size all the way around, and are they set exactly the same way???

  10. #8
    Boat Nut sleekcrafter's Avatar
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    Quote Originally Posted by bp298 View Post
    you say "on the hit"? is that full throttle or part throttle? if it's part throttle, what does it do with a full throttle hit from idle? do you have the same size squirter nozzles all the way around? are the accel pumps exactly the same size all the way around, and are they set exactly the same way???
    Still in the early stages of dialing these in. No hesitation on the hit, partial or full throttle. The squirters are the same on all sides. Partial throttle yields black smoke, on the right side as does full throttle on the full hit. Im getting too much fuel on the right side, not enough on the left side. On start up it fires right up with a shot of fuel from all the pumps, but hard starts with just the primary shot of fuel. The left side exhaust is totally clean.
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  11. #9
    gn7
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    Power Valves? Double check you float levels!!!
    About the only way to have one side run that much richer is if you have fuel puddling in the manifold.
    You say it starts OK with a full shot, but not with a partial shot. But are you leaving the throttle wide open when starting with the full shot, or closing it back to the same place as when you only give it a partial.
    Why do you think you not getting enough fuel on the left side. I understand saying too much on the right. But why do you say not enough on the left. Plug readings?

    Which side of the engine are the primaries on?

    Does it blow black smoke all the time your running it, or only when you start it or hammer it?
    What plugs and ignition are you running?



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  12. #10
    Senior Member bp298's Avatar
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    Quote Originally Posted by sleekcrafter View Post
    Still in the early stages of dialing these in. No hesitation on the hit, partial or full throttle. The squirters are the same on all sides. Partial throttle yields black smoke, on the right side as does full throttle on the full hit. Im getting too much fuel on the right side, not enough on the left side. On start up it fires right up with a shot of fuel from all the pumps, but hard starts with just the primary shot of fuel. The left side exhaust is totally clean.
    hesitation is usually a leaning condition, so if you're seeing black smoke, wouldn't expect it. do these things have power valves, or are they blocked with the carbs squared? how far open are the mixture screws? have you made any changes to bleeds or ifr's? has this thing always behaved this way or did it just start?
    do you have a vacuum leak somewhere? are there vacuum ports on these carbs that have rubber caps? and if there are, are all of them still on? any of them old and cracked, or not tight? is there any kind of port off the carb bases or intake manifold that is leaking at all? any cracks/checks in hoses off the carb/intake?

  13. #11
    Senior Member ol guy's Avatar
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    First question would be how does it run after start and after it cleans out? Second would be how does it run at the ramp when pulling out after the day? Second would be (and most important) do you run the carbs dry before the tow home, When you are towing home and bouncing along the road with full floats and a engine not running ( with feul splashing down the runners and and finding every open valve to load up) . Just a thought. M

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    For what its worth I set the floats on my TR doms at the bottom of the site plugs then lower them 2 wrench flats below. Any higher than that there will be some drips from the butterfly shafts when it sits after running which means fuel is dripping inside. Consequently it also starts harder when that scenario exists. Good luck!

  15. #13
    Boat Nut sleekcrafter's Avatar
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    I'll lower the float levels a bit more.... clearance the booster levers, and go over stuff once more. Once cleared up, it does not smoke from 1/4 to full throttle hits. It for sure needs one full throttle pump from all four pumps to start easy.
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    Senior Member motormonkey's Avatar
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    Are you running 1 to 1 on the carbs? If not maybe try that and set it up square.

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