Thread: Building A looper Beast

  1. #211
    Administrator Aeroliner's Avatar
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    Default Fuel Pumps

    We run our Merc 44 with two pumps and turn the engine about 8,600 RPM. I know folks that only run a single pump on their 44 MOD engine and it works fine. I am sure the 5 pump configuration will provide far more fuel then is needed. The single feed line might be an issue but if this was made into a larger manifold it might distribute the fuel better.

    Second thought! Looking at the carbs they have a rubber hose between each carb so 6 carbs equal's five hose sections. If a tee was placed in each hose then the 5 pumps would connect very nicely and the engine would have a very nice balanced fuel system.

    Also remember that the 75-H engine only has 2 fuel pumps and a inlet fuel distribution block.


    Alan
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    Team Member GHMiller's Avatar
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    Quote Originally Posted by R Austin View Post
    The issue was a real estate problem. If you look between each fuel pump there is a black nut. That is the nut on the stud holding the intermediate case, along with the main thru bolts, to the block. I reasoned that if 3 fuel pumps can supply 60 cubic inches, which is 20 cubic inches per pump, then the additional 40 cubic inches of displacement can be supplied by 2 more pumps at 20 cubic inches each. I do not care for electric pumps and the only other option was to pressurize the tank with crankcase pressure. I am sure the 5 pumps will be sufficient.
    I understand what you are saying, it make sense to me now, thank you for your explanation. I believe you are correct that five pumps should be sufficient. On my mod 44 I run one inline six, 150hp, fuel pump and it works perfectly.

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    Can anyone explain where all those fuel hoses in the photo are going to/ coming from?

    Jeff

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    Default 75-H fuel hoses

    The square block on the center fuel pump mount has the fuel inlet at the bottom hose. From the fuel block the upper hose feeds the top pump and the lower feeds the bottom pump. The carbs are all on a common fuel manifold with the upper pump feeding at the top and of course the lower pump feeding to the bottom. Hope this helps on the 75-H photo.

    Alan

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    Team Member R Austin's Avatar
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    Correct Alan, the plan is use 5 tee's in the hoses between carbs. The question is the number of fuel pumps it will take to supply the required amount of alcohol not gas. Having just 50% of the BTUs of gas, it requires twice the quantity. That's why the 3 pump comparison to the 60 inch looper was made. I have no doubt 5 are enough.

    your collection is absolutely incredible.

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    Outstanding explanation!

    Thanks.

    Jeff

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    Team Member R Austin's Avatar
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    Few more pictures of some of the small work that has to be done. Trimmed the sleeves on the block and faired in the transfer passages.

    Got the pistons back from coating process and fit to the cylinders and then fit up the rings. Now the block, case, and pistons are ready for final assembly. Just waiting on the completion of the center main bearing races.

    Welded up the drain passages in the back of the manifold reed cover. Then refaced both surfaces.

    While waiting on the bearings, I have started to modify the carbs and continuing work on the megaphone patterns. Coming up on the second anniversary of the start of this project. Now looking at the end of the tunnel.



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  8. #218
    Team Member F-12's Avatar
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    Beautiful, Mr. Austin.
    Charley Bradley


  9. #219
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    Your photography is also excellent, by the way.

    Jeff

  10. #220
    Team Member BJuby's Avatar
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    That carb adapter is simply an amazing piece of craftmanship. Well done, and SO CLOSE!

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