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Message
Greetings,
Attached are pics of the
current intake situation. They're cropped and compressed as much as
I dare, in order to be more dialup friendly. Some comments on the pics
follow:
1- I recently added
the scoop in a scoop to try to improve my MAP in-flight, but I can't say it
worked. I'll probably remove the scoop part, and leave the smooth hole in
the bottom of the rad diffuser, which might be better than the way it is now.
2- Another view of
the inlet and hose to the airbox. This is 3" ID SCEET (inner and outer
layer of material).
3- A view of the
airbox. As you can see, it's small, and can't be much bigger. The
cowl is almost touching the top of it.
4- Inside the
airbox. This shows the 40mm TB inlets, and the "shorty" air horns that TWM
sells.
5- The top of the
intake, where the TB bolts to the two runners. The yellow hoses are MAP
ports, and are connected together for a more stable reading. The MAP ports
are only about 4" from the inlet to the TB, so I'm losing about 2.5" of MAP in
the first 4" of intake. The tubing is the same ID as the TB, about
40mm.
6- This shows the two
main runners merging into the Mazdadrix intake. I spent a lot of time
getting the transition smooth inside, so it's much better than it looks
from the outside. If I decide to try Bernie's pitot idea, the ideal place
would be to drill and tap a small hole directly below the main runners, there
the primary and secondary split.
I've measured the port size
on the housings, and found that the combined primary and secondary port areas
equal a 45mm ID tube. Clearly, my 40mm ID tube and TB is smaller than
that, so I'm sure that's an issue, though not sure how much of an issue.
The airbox is tiny, and
lacks proper "trumpets", which is what Leon feels is the main problem. I
have to agree. Unfortunately, in the confines of the area where this is
located, there's no way to do it properly.
The burning question for
Lynn and others- is the 40MM size of my TB and tubes causing me to lose power,
or is this strictly a problem of not being able to get air into the TB
efficiently enough?
Without scrapping the whole
intake, the best thing I can think of to try is to add a tube joining the
two main runners. If the 40mm runners are a problem, then the tube would
have to go near the intake end of the runners, but if the problem is mostly
getting air into the TB, then the balance tube could go near TB end of the
runners, and would disturb the momentum of the airflow in the runners
less. Installing the balance tube seems like it would
act the same as a tiny plenum does in a more typical system.
So what should I do about
this, and be nice :-)
Thanks,
Rusty (Sonerai Sold, down
to only one unflyable plane now)
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