First a little background on the carbs. They are Tillotson carbs made for the Army mule. The carbs were used on a twin cyl engine much like the 084. These twin cyls are a 42 cubic inch motor which is exactly half of the 084. The good thing about these crabs is that they are made to be on a motor with varying rpms which the carbs on a 084 are not, they are designed to run at a constant 3600 rpms.
These carbs also have air and fuel adjustments as well as a accelerator pump making it a good choice for these motors if run as a dual setup.
The carbs.
The animal they are designed for, the Mule.
I had some time to spend in the shop today but I didn't get much accomplished other than some head scratching. I am making or trying to make new intakes to allow these carbs to be used on our 084s. I didn't want to just build a box plenum because they are just not efficient and do not flow well. If you have any corners the gas will get trapped there and not flow well. I am trying to design intakes that will get the best performance from these carbs using round tube.
The problem I am having is becasue of the magneto position it is hard to get the right placement on the carbs. After looking at if for some time I see that I have two choices. One would be to raise the intake tubes so the carb on the mag side has room above the mag, this would require that I also raise the other side to match to make both intake sides the same. The other is to scrape the "use the stock intake tubes" idea and make a new set of intakes that would bring the carbs to the outside of the engine right above where the intake tubes come out of the cylinders.
Like this
The problem with this is that it would be a nightmare to figure out a reliable throttle linkage. I'm now trying to figure out a way to stack them. There are other ways to do it also by making a plenum in the end of the stock intake to accept the two carbs but this just would not be efficient.
Any ideas would be appreciated.
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