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From: Lehanover@aol.com
Message-ID: <142.3dc30a23.2f23ff38@aol.com>
Date: Sat, 22 Jan 2005 14:10:48 EST
Subject: Re: [FlyRotary] Dynos II (was Re: changed to Octane)
To: flyrotary@lancaironline.net
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In a message dated 1/22/2005 12:08:34 PM Central Standard Time, 
dale.r@cox.net writes:

<<  Thank you very much for the idea.  It isn't directly 
 applicable to my situation, because I don't have a car 
 to use as a "chassis" test bed.  However, it did give me an 
 idea - using a gang of disc brake assemblies, for creating 
 an engine dyno that might come in at under $1000.  
 (Actually, a direct coupling to the truck rear-end might 
 do the job - if the brakes are big enough and I can figure 
 a way to take the strain reading directly from the axel 
 housing.)
 
 Dale R.
 COZY MkIV #1254
  >>


There is more than one way to skin a cat. 

Build a disc to bolt to the companion flange of a truck differential and the 
flywheel of a rotary.

How about elongating half of the bolt holes in the backing plate, in an arc 
to conform with the bolt circle diameter. Use smaller bolts and drop in a small 
needle bearing around each bolt/stud. Now the backing plate can articulate a 
bit around the centerline of the axle. Mount the transducer to a bracket 
welded to the housing, and the other end to the backing plate. Calibrate the output 
with a torque wrench. 

There you go. A truck axle dyno.

Don't forget the math to take out the effect of the differential ratio, lest 
you report some giant numbers.


Lynn E. Hanover