flyrotary@lancaironline.net Mailing List Archive

Interesting! I didn't know Mistrial had a mounting plate like that. Do you have any pics or a source for one? I am in the same situation with a 20B and the project I bought has a Dynafocal#1 mount.

Thanks for any info.

~~~tg~~~

From: Kelly Troyer <flyrotary@lancaironline.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Monday, June 22, 2015 3:00 AM
Subject: [FlyRotary] Re: PERIPHERAL PORT INFO (Mark Steitle)

Mark,

Glad you mentioned your use of the individual throttle body's as I had forgotten that you replaced the slide throttle.......I presume

that you used the two inch OD stainless intake tubes as called out by Paul Lamar ?...........The 48 mm TB's are an almost perfect

match for the intake tube ID.........Did you use any "Devco" sealant in the water passage around the intake tubes in addition to the

red gasket sealant under the plates ?.........Also did you have any problem with TIG weld "Spatter" getting on the chrome surface

of the rotor hsg and causing any damage ?.........

I have one of "MISTRAL's" mount plates which bolts up to a Lyc "dynafocal" mount ring and solves the thorny Rotary Engine

mount problem and will allow me to switch engines (hopefully) at some point........I am building a somewhat hybrid version of the

13BREW with RB alum rear and center hsgs (expensive 28 lb weight savings) ..........I am retaining the iron front hsg (rear in my

a/c) as the "MISTRAL" plate bolts up to it with several 6 mm bolts and I was not fond of the idea of my entire engine hanging on

these bolts into aluminum threads.........I also have a TO4E Turbo on the bench just in case I get this done in this lifetime........<:)

Thanks Again,

Kelly Troyer

On Sun, Jun 21, 2015 at 3:28 PM, Mark Steitle <flyrotary@lancaironline.net> wrote:

Kelly,

P-port 20b is working great. It loves to rev. and produces noticeably more HP at WOT than the side port motor did (verified by increase in TAS) I first tried the boring and welding process on a scrap housing and didn't detect any warping or shrinkage, so I decided to go ahead and do it to the good housings. I think my "test housing" is the picture that PL posts when he discusses welding the p-ports. The sealing plates only seal around the large inlet tubes and don't totally solve the problem of sealant leakage. They could use a second o-ring, or gasket, between the sealing plate and the housing surface, IMHO. There is the potential for leakage where you bolt the plates to the housings. I had some small but persistent leaks around the small 1/4" dia. bolts. I was finally able to get those to seal by putting a small counter-sink where the bolt head touches the plate and using an o-ring under the bolt head. I used button-head bolts. This solved that problem.

You'll also have to figure out the intake. Rumor has it that the throttle plate needs to be as close to the port as possible for good idle characteristics. You could save weight by engineering the throttles into the housing, or do like I did and use three 1-bbl throttle bodies located as close to the SS inlets as possible. I found a set of three 48mm tb's off a sea-doo for $100. I chose these because they had injector bosses cast right into the TB housing. I had to machine a new throttle shaft to get the spacing right for the 3-rotor. But they are working out nicely.

Thanks,
Mark

On Sun, Jun 21, 2015 at 9:56 AM, Kelly Troyer <flyrotary@lancaironline.net> wrote:
Mark,

Even though I am going to the Dark Side (IO-360) for expediency for the time
being I still want to use a Rotary eventually.........I am seriously thinking about
P porting my 13B and would like to know how your 20B is holding up particularly
at your port insert junction using the machined plates and sealant.........Have you
had any major problems with leaks so far ?.........I have a pair of plates from Paul
that have the "O" rings and if I recall correctly your plates were prior to the ones
with "O" rings..........I am curious whether you had any major problems when you
were smoothing and putting the radius the "TIG" welds........On the same question
did the "TIG" welding seem to cause any warping of the rotor hsg steel liner ?........

Thanks,
Kelly Troyer