George Lendich wrote:

Paul and Jerry,

I've been thinking about these inlet manifolds and was wondering
if
rectangular tubes made from flat sheet could be used without  too
many negatives.

The benefits are the bends would be so much easier to do.

The height would be maintained at the minimum for those with
limited
over engine area.

The injectors would be OK side by side without needing to angle
them
to the centre of the tube.

The negatives would be you couldn't use a round bellshaped inlet -
however a square one might be near as good.

I don't know how much the square corners (in the runners) would be
less efficient than a round tube - you would however have more
volume
area.

Some suggestions on the negatives would be appreciated.
George ( down under)

Too much welding of thin sheet :)

Paul Lamar

Here is what it could look like with the retaining clips.

Paul Lamar

How far from the bellmouths can the injectors go before the
spraypattern
will open up too much?
Or how far away is considered optimum?

Thomas J.

I have no idea. We are guessing about all of this. currently the
design is partially
determined by what fits. We need a fair size plenum and we are limited
in height.

We could go to the longer TWM air horns inside the plenum if that
proved to be a problem.

Paul Lamar

I just read that up to 4 inches was o.k.  Jerry

If I were feeding the air into the center of the plenum I would do it like
this. Both the ME109 and the P38 used air intakes like this. Tracy Crook
just found out these work very well. His version needs a bit of streamlining
as shown in these 3D. Back in the early 70's we called these shaker hood scoops
when used on the Pontiac Firebird Transam. This is a 3 inch tube bend on a 4 inch
center line radius.

Paul Lamar
 
The Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/            
Copyright 1998-2004 All world wide rights reserved.