Paul wrote:
Hi, Paul....I have been thinking (my first mistake) about the obvious advantages of longer intake runners, and I noted that on the PP intake, the butterflies are often very close to the engine, and
the long runners are after the butterflies. Also it seems that it is possible to put the injectors close to the engine as well, as Mistral is now proposing. What might happen if longer runners were
put onto a system like I have (Atkins) or similar, where the throttlebody and injectors are say, 6 inches from the engine, and then you add another 12 inches or so of runners after the throttlebody
and injectors. Would there be any advantages (power) to doing that, or might it make things worse? I was lying in bed thinking about that....perhaps I shouldn't lie in bed thinking anymore?
Thanks in advance for your opinion/explanation. Paul Conner
You are not allowed to have "Y's" in the runners. That is a big no no. Any discontinuity in
the middle of the runners such as a butterfly will cause problems and defeat the tuning.
The Le Mans engine, like my latest combo plenum, uses slide throttles that are completely
out of the way 90% of the time in an aircraft engine. No obstruction in the runner
what so ever. Jerry's system is a compromise and it would be better with slide throttles
close to the block. Lets do that Jerry in the next prototype.
Does not really matter where the injectors are but it would be nice to keep that
50 psi fuel as far from those cherry red rotary exhaust systems as possible. Not
unless you are willing to wear a parachute at all times because an in-flight fire
can ruin your whole day. It takes time to dive an airplane into the ground if it
even makes it in one piece. You got a choice, burn to death or jump out and smack
the ground a good one.
If you don't like the drip use a catch pan and drain on the cool side.
Paul Lamar
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