Paul, Here's a few pics of the muffler. I've got drawings of it
someplace... All stainless.  Single pipe into the plenum. Pipe is
drilled--a lot of half in dia holes. Two exit pipes also drilled.
That's it.


Lewis Bjork


It is doing a good job.

Most likely to collapses and plug up are the down and out pipes. Do
you remember the wall thickness?

Is it 321 or 304 SS?

Easy to inspect or check with just a flash light.

Paul Lamar


Don't know the steel alloy.  Thickness is doubled where it exits the
engine because of a spring loaded ball joint. Hopefully that will
mitigate cracking.

Lewis.

That is a p-port right? Kind of hard to tell from the pictures.

This is the best intake picture I have.

What is the highest RPM you have seen?

Is it carb or EFI?

Paul Lamar




Don't know the steel alloy.  Thickness is doubled where
it exits the engine because of a spring loaded ball joint.
 Hopefully that will mitigate cracking.

Yes, it's a p-port.  Ellison tbi efs-3.
Highest rpm, static, with the current prop (95 in pitch, very coarse), about 6200.
Ivo prop went higher, with adjustable twist, but caused major cooling issues.

The pitch is worthless near the hub.  Not much air movement into the cooling intake.

We fixed a long vinyl tube onto the pitot, taped it to a stick and held it close to tape
 marks on the spinning propeller, then simply read the airspeed indication
 corresponding to the marks, with the engine idling.  All of this led to
 the purchase of a new prop.  Fixed pitch, unfortunately, but 1/3 weight of the Ivo.

No cooling issues with this one:

Hopefully, not over pitched for the airframe.  Looking for a 200 mph cruise at 6500 rpm.

Lewis.Bjork

Good point on that IVO prop. Good R&D on the air flow around the hub.

I assume you have K&L wedge diffusers on the inside protecting
the rads from engine heat.


How far is the ellison from the p-port roughly?
Do You have a intake pipe from the air scope to the Ellison?
If so how long is that? I am trying to determine the tunning.


You are doing a great job Lewis.

Paul Lamar

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