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Kelly, It is a Tee with a top branch made of clear tubing. The side of the Tee is connected to the spark plug location. Using some fuel line (anything handy will do), I connected this side branch to an old spark plug with the internals removed. An o-ring seal was used on the spark plug instead of the metal one so hand tightening was enough. The bottom of the Tee is connected to a balloon with soapy water in it. Squeezing the balloon and releasing it will leave a soap film across the side branch. Turning the eccentric shaft will displace the soap film up or down the top branch of the Tee. It will take a little trial and error to get close to TDC where the soap film isn’t blown completely out of the top branch. Steve From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Kelly Troyer
Sent: Thursday, February 24, 2011 2:35 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: TDC Guess I am a little dense !!...............Understand the process but am not entirely sure how it is made...........
Kelly Troyer
"DYKE DELTA JD2" (Eventually) "13B ROTARY"_ Engine
"RWS"_RD1C/EC2/EM2
"MISTRAL"_Backplate/Oil Manifold "TURBONETICS"_TO4E50 Turbo
From: Bill Schertz <wschertz@comcast.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Thu, February 24, 2011 3:14:39 PM
Subject: [FlyRotary] Re: TDC If I had been there (had a conflict) I would have taken one, as is, it looks pretty simple to make. Great idea. Bill Schertz
KIS Cruiser #4045
N343BS
Phase I testing Completed Sent: Thursday, February 24, 2011 3:05 PM Subject: [FlyRotary] Re: TDC You gave away at least One. I used it to find TDC on my 13B that Sunday afternoon when I got home from Paducah, worked great, and confirmed that the timing mark on the case was in line with the mark on the E shaft. Bob Perkinson
RV-9 13B
From: Steven W. Boese <SBoese@uwyo.edu>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Thu, February 24, 2011 10:28:05 AM
Subject: [FlyRotary] TDC Chris, The attached photo shows a device that makes it easy to determine the location of the minimum combustion chamber volume (TDC) within a degree independently of any existing front pulley or flywheel markings. Connect it to a spark plug location and just rotate the eccentric shaft to the point where the soap bubble in the clear tube is the highest. It might be worth a try. I made up a number of these to give away at the Paducha fly in last summer. The lack of interest was surprising since I couldn’t even give them away. Steve |
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