> Jerry Hey wrote:
>
> Please look at this proposed muffler installation. The muffler sets
> to the side of the wedge oil pan but mostly it is below the oil pan.
> The clearance to the oil pan is about 1.250 inches. The radiator
> sets to the right side and below. Rad to muffler clearance is about
> 5 inches. The intake plenum, above the radiator is opposite the
> muffler. There is room to shield the pan, plenum and radiator.
>
> The 3 inch square muffler would be made of .065 304 Stainless. I
> think I will just buy some 3" wide strips and weld it up. Also, am
> considering making the tail part removable so that different options
> can be tried should noise be a problem.
>
> The primaries would be 2 inch round and approximately 22 inches long.
>
> I would appreciate critical comments from anyone. Thanks , Jerry
>Here is what I have so far.
>
>Paul
Amazing! When do you sleep? I will get the measurements requested
in the other e-mail later this morning. I see you picked up on the
fact that the muffler is laid over a little bit. I did not plan to
do it that way, but it solved a bunch of fit-up problems. Also, I
grew to like the idea of the 45º down pipe moving away from the
engine. It created more space. The muffler will be trimmed to barely
stick out of the cowl, eventually.
The whole design is a first
attempt and I am sure that others will perfect the concept. It can
be thought of as a stretched out version of your tuned tangential. I
think the design is a breakthrough (it certainly is for me) because
it accomplishes the goals of long runners, free breathing, quiet,
inside the cowl, exhaust system . O.K. I realize some of these
claims need to be proven but I am confident that whatever problems
come up can be dealt with. Jerry
snips..
Jerry
I think Jerry is right on with this muffler design. It is easier to weld up
and uses up only nine inches outboard of the engine and nine inches below
the pan rail. Assuming the MM hard points on the firewall are at least
30 inches apart and the motor plate rubber bushing center to center
distance is 30 inches this muffler should fit.
The design shown uses two 90 degree two inch diameter
tubes on a three inch center line radius and two 180 degree bends on
the same center line radius. These can be had at low cost from RB Wagner.
The tuned length of this particular configuration is 32 inches.
This particular version may get in the way of tailwind and RV6 type
tail draggers
as the diagonal bracing to the landing gear socket tube may interfere.
That still needs to be investigated.
BTW there is one tremendous advantage of Rhino 3D over a full scale
under cowl mockup. It usually takes some buying of expensive equipment
like HKS turbo manifolds or pipe bends to make a full scale mock up.
If you can get a drawing or sketch of the part and you have Rhino 3D
you can try before you buy,
Paul Lamar
Beautiful design, Paul. It fun to see an idea blossom. Once this
design is finalized, if it isn't already, I would be more that happy
to build a fixture and produce them. Although I made my MMP
narrower, I am now recommending to anyone who asks, to just use the
wider plate. It makes the installation so much easier when there is
sufficient space.
BTW, I think the RB Wagner stuff is too heavy. Jerry
I think you have to ask for .065 wall. 0.140 wall is standard.
Paul Lamar
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