Dave,

How did you go about determining the size you could fit?  How much clearance from the cowl did you feel you needed and how are you shielding the cowl?  How big is the turbine you are using and where did you determine the sizes of the turbines available.  Do you have any pictures of your installation?  If not, could you post some next time you have your cowl off?

 

Bill

 

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From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of David Leonard
Sent: Thursday, October 31, 2013 1:57 PM

To: Rotary motors in aircraft

Subject: [FlyRotary] Re: Wrong turbo, maybe better this try

 

I use a bored out stock turbine housing with a TO4 turbine blade.  I am not sure about the A/R but it is far less than optimum but is the only thing that will fit without major modifications.  Yes, that is what I raced at Reno and I was still not at WOT.  

 

Dave Leonard

 

On Wed, Oct 30, 2013 at 4:58 PM, Kelly Troyer <keltro@gmail.com> wrote:

Dave,

 

   What is the A/R ratio of your TO-4E/50 turbine housing??..........My TO-4E/50 (hope to run in this lifetime) has a 1.15 A/R ratio turbine housing. Is your

TO-4 what you were running at Reno ??..............

 

Thanks,

 

Kelly Troyer
Dyke Delta_"Eventually"
13B_RD1C_EC2_EM2

 

On Tue, Oct 29, 2013 at 5:33 PM, David Leonard <wdleonard@gmail.com> wrote:

You are right Scott, that is a much better turbo, though I doubt you were experiencing compressor stall at power settings you would want to use on the ground.  I also fly with the TO4E-50, but have used the 60-1 in the past with good success.  And yes, your turbine housing should be as big as you can reasonably fit.

 

Dave Leonard

 

On Tue, Oct 29, 2013 at 2:41 PM, Scott Emery <shipchief@aol.com> wrote:

Here is a pic of my 13BT powered RV-8. I've already blown & rebuilt the engine, now I've learned from ground running and forums that the 60-1 turbo with .81 A/R housing was not good in 2 ways: the compressor was too large and the turbine housing too small. The resultant increase in exhaust Back pressure rising too rapidly with boost pressure. This held back any hoped-for power gain. Also, the compressor seems to have been on the verge of stall, with fluctuating boost pressure during tethered power testing.
The pictured TO-4E has a 50 trim compressor & 1.30 A/R turbine house. I did run it briefly before I had to return to work, it ran very lean. I'll be reprogramming the EC-2 during the next run. This forum & Ross Farnham over on the Vansairforce were big helps getting me researching in the right direction.
Possible future intercooler location is along the Charge Air pipe on the left side. The hot jacket water pipe will need to be relocated.

Sent from my iPhone
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