Jerry wrote:
Your drawing showed the S beam ends sticking through the
sides of the
cowl so I had to deal with that first. Until we get the
cowl drawn as it really is we cannot have faith in the
drawings predictions. The physical model looks a less
alarming regarding
room
over the top. Then there is the possibility of increasing
the
spinner
diameter a TINY AMOUNT and, at the same time, raising the
top of
the
firewall JUST ENOUGH to get what we are looking for while
retaining
the look of the Tailwind and the ability to see over the
nose. I
don't
feel I have exhausted my options yet.
Paul Lamar responded:
I fixed the cowl even though that had no bearing on the real
problem.
More bad news. Even my mail box intake manifold won't fit
the stock cowl. This one is made with the 3 inch center line
radius 2 inch tube. Would be slightly smaller with the R$B
Wagner pipe.
You will never see over the nose :) I can make a blocky cowl
that fits if that is what you want :)
If you're going to make spaghetti intake runners, why not
make them
face
forward next to the starter, and use the cheek intake to feed
it?
Russell Kent
Yes. I'll try that. You mentioned it before and I got side
tracked with
the stock tail wind cowl issue. Good idea. Jerry will have to
give up
one of his oil coolers or put a stock cooler alongside the rad
under the engine with longer cowl flaps.
Paul Lamar
Excuse me for not being blown away by the obvious to you which
is not
obvious to me in my shop at all. I went ahead and added a 4
inch dia
plenum to the end of the intake runners. It can be square,
does not matter. I kicked the end of the runner down with a
45º. Once again,
here are photos of the actual, real, physical reality. They
paint a
pleasant picture. I accept that I may be guilty of some
strange error
and that you are right. I have experienced that before. But
so far,
it does not seem that way
Again the tube represents the line of the cowl. Once
you get
to
the cool side, there is plenty of room for an air filter and
ram air too. The cheek openings (2.75" x 7") are sufficient
to cool a Lyc 0-360. The rotary oil coolers are expected to
handle 30 percent of the cooling load or 15 percent per each
side. I think there will be
plenty of air for them and for the intake too. Let us say I
use half
of the cheek opening for ram air. That is 9.5 sq inches of
opening for
the ram air compared to 7 sq in for the three inch snorkel.
Or if 7
sq in is enough than the oil cooler can have 11.5 sq in. What
is wrong with that? Jerry
No the tube does not represent the top of the stock cowl.
The stock cowl drops down on both sides of the spinner.
Paul Lamar
I clamped a straight edge to the backing plate and laid the
tube on
it not on the edge of the backing plate. The straight edge is
4.5 inches from the center, or the equivalent of a 9 inch spinner
or the rough equivalent of the cowl height outboard of the 12
inch spinner ring. Jerry
Now we are getting somewhere. Your sketch is not to scale and or
is wrong on
the bend shape.
Is my drawing correct as to the thrust line relative to the top of
the firewall?
Paul Lamar
I intend to take a section out of the bend. I know you do not
like this but I am willing to see how well I can do with it. It is
not a simple section and reweld. I will have to add material to
the inside and blend and shape before rewelding. If that does not
work, then perhaps the 1.5 i.d. from Wagner. Jerry
You don't need to do that. Just tilt them back at a 20 degree angle.
puts them back under a higher section of the cowl.
Here are the 3D.
Paul Lamar
Paul, over the last year there were few people complained about
dribbling injectors after shut down. I wander if it is healthy to have
standing gasoline in the plenum, which can happen in the one you are
showing? I'm thinking about the possibilities of a big BOOM! :)
I made sure my injectors and runners face downhill towards the engine
ports. On my engine also the original injectors were oriented to face
downhill. What do you think?
Bulent