The powersport website is offline (as mentioned in the other thread I started).. and I am not sure when that exactly happened. So, this truck axle dyno sounds somewhat attractive..
 
Rather than making this "flex plate" adapter, it seems workable to put the PSRU onto the airframe (Tracy's RD 1B) and mount a u-joint/flange on the axle shaft to couple to the PSRU flange.
 
I need to see what I can come up with parts wise (junkyard I guess) but the instrumentation end would be interesting.
 
Dave

Dale Rogers wrote:

Lynn Hanover < Lehanover@aol.com > wrote:

  

Paul Yaw cannot charge enough for dyno time. If he stops work on his engines 
to rig up a customer built engine, it will take a bunch of time and then there 
is the possibility that the outside engine is crap and disintigrates on the 
dyno. Then what?
...
Plus the liability if your project dies on his dyno.
    

Lynn,

   Those two parts, I understand.  However ...

  

So there is no way a popular engine builder can take time out from what he's 
up to and blow 8 hours of his and his dyno's time. Or at least you couldn't 
afford it if he would.
...
You pay him at least for 8 hours to get less than one hour of data and tuning 
if it doesn't blow up. 
    

   A year ago, when Paul gave me a quick tour of his newly 
reconstituted shop (after moving from Tucson to Phoenix) 
he actually quoted me a figure for dyno time - basically 
describing, as you said, that a session would have to be 
scheduled for at least six hours.  I figured once I got 
the engine built and run in, it would be worth $800 to get 
confirmation that I was getting the ponies I was seeking.
Perhaps he thought I was going to buy an engine from him?
I don't think so - considering that I started out asking 
about sources for some parts I needed, and talked about 
the engine I was building for my "off-road" vehicle.

   I'm assuming that this is a policy change due to his shop 
being busy enough now, that he no longer needs the income 
from taking in outside work.

  

A simple chassis dyno is ... 
    

   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



  

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