[Diy_efi] Rotary tuning

Tue Feb 13 01:08:23 UTC 2007

Yeh, the DynaCam is a cool engine but not simple to make, LOTs of parts!

If he can properly machine a Wankle-style rotary housing and rotor, he will
have many fewer parts.  The seals aren't black magic either.

Interesting project.

Dan Nicoson

-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On
Behalf Of Ernest Buckler
Sent: Monday, February 12, 2007 3:59 PM
To: tmc_mike_yates at sbcglobal.net; diy_efi at diy-efi.org
Subject: Re: [Diy_efi] Rotary tuning

Mike,
Do you know about the DynaCam engine?  People thought it was a swash-plate
engine, but it actually has a 4-lobe sinusoidal crankshaft.  12 double-ended
pistons with central roller bearing push this crank around.  Plate cams at
each end operated normal valves in the 6-cyl. heads.   VERY torquey, very
smooth, lower parts count.  FAA actually certified a 300 hp version for use
in light aircraft AND  HELICOPTERS in 1957, with a TBO of 1500 hrs, sayng
they expected that interval to be increased, as they found no appreciable
wear at 1500 hours.   The Navy used a single-sided version of this as a
torpedo motor for many years, was Top Secret until turbines replaced it.  I
knew a guy who overhauled these in the practice torps, says they were
"coffee-can" size.   Serious efforts to commercialize it have been made,
last I heard the Co. still existed at Torrance airport, but there was very
little about it on the web, last I looked.  Rumor has many reasons for
company failure, most bad management.   Cool thing is that it still uses
std. piston rings, also normal valves & springs, so no re-inventing the
wheel, as there is on Wankels, with all their side and tip sealing
challenges.

Ernie B

----- Original Message -----
From: "Mike Yates" <tmc_mike_yates at sbcglobal.net>
To: <diy_efi at diy-efi.org>
Sent: Monday, February 12, 2007 12:12 PM
Subject: Re: [Diy_efi] Rotary tuning

the rotary parts have no different requirements except you usually use
2 spark plugs per chamber due to the distance the flame front has to
travel.   plans at this point are for a go-kart application but who
knows i just want to experiment with larger eccentricity (i.e.
basically stroke) to see if any reasonable amount of torque can be
made from a rotary engine.

plus they sound so damn cool at 9k rpms

Mike

On Mon, 12 Feb 2007 12:22:03 -0600, you wrote:

>Hi Mike no real suggestions for parts -- are coil packs or ignition
>pickups different for the rotary or can you use conventional engine
>parts?  Mostly just wanted to write and say this sounds really cool and
>to keep the list posted on how you do.  What do you plan to do with the
>engine?
>
>--steve
>
>> -----Original Message-----
>> From: diy_efi-bounces at diy-efi.org
>> [mailto:diy_efi-bounces at diy-efi.org] On Behalf Of Mike Yates
>> Sent: Monday, February 12, 2007 11:25 AM
>> To: diy_efi at diy-efi.org
>> Subject: [Diy_efi] Rotary tuning
>>
>> ok here goes...I work with CAD/CAM software all day at work (aerospace
>> machining) so i'm drawing up plans for a small displacement
>> ~1.0 liter rotary engine 3 rotor most likely with a larger
>> eccentricity than the 13b.
>>
>> long story short i dont want to slap a carb on this i'd like
>> to go FI anyone have any ideas on what i need from the junk
>> yard or where i could source parts like coil packs and an
>> ignition pick-up/driver?
>>
>> if anyone has gibbs cam or can open .igs files i'd be happy
>> to share the product of my sleepless nights.
>>
>> Mike
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