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Date: Fri, 12 Sep 2003 11:29:20 -0400
From: Jim Sower <canarder@frontiernet.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: turbo wastegate requirements
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Marvin,
<... stock Mazda turbo and controlling the internal wastegate, or are you
planning on an after-market unit with separate wastegate ...>
I must confess that I'm not that far along yet.  For me, this thread has been more
of a brain storming session than a detailed design proposal.  My feeling is that
the Mazda stock turbo has demonstrated that it can stand up to the hideous exhaust
pulses the engine emits, and that is IMO a critical consideration.  Also, I would
prefer an "internal" wastegate on principle since it _sounds_ as if it's more
reliable and compatible.  I don't anticipate that the linkage to operate the
wastegate will be a major design challenge.  I don't even know how much heavier
the stock unit is than after-market ones, but at this point I feel like I have to
take the hit if only because of the assurances that the stock unit will withstand
the exhaust pulses.  We all remember Tracy's experience with mufflers on turbo
rotor housings.  If those heavy SS mufflers blow up in 10 min, how long is an
aftermarket turbo going to last?

<... aftermarket turbo and throttle-plate style wastegate (as opposed to a
Delta-gate or one of those poppet-style units ...>
I don't know what a Delta gate is and I thought poppet valves were strictly for
the popoff overboost prevention rather than boost adjustment.  That's how new I am
to all this.  I know a little about fluid dynamics and behavior of gasses and all
but nothing of any consequence about turbocharger design.

<... has anyone come up with the real spec for the appropriate turbo, ie, T-what?
turbine trim? Compressor trim? ...>
I'm not at all sure what you're talking about here either.

I'd better get back to lurking ... I've already told you more than I know ... Jim
S.


Marvin Kaye wrote:

> Jim Sower <canarder@frontiernet.net> wrote:
>
> >>>My scheme is to have two "Throttle"
> levers
> - a long one to the throttle and a shorter one to the wastegate.  The
> wastegate
> would remain "OFF" or all the way back for ground and pattern operations. <<<
>
> A nice well-reasoned approach.  Refresh my memory... are you planning on using
> the stock Mazda turbo and controlling the internal wastegate, or are you
> planning on an after-market unit with separate wastegate?  I've got a stock
> turbo from the first 13B that I purchased and it would be pretty simple to
> hook it back up.  The only problem with it is that it's really heavy.  I'd
> prefer an aftermarket turbo and throttle-plate style wastegate (as opposed to
> a Delta-gate or one of those poppet-style units.)  That being said, has anyone
> come up with the real spec for the appropriate turbo, ie, T-what? turbine
> trim? compressor trim?  Lots of questions......
>
>        <marv>
>
> >>  Homepage:  http://www.flyrotary.com/
> >>  Archive:   http://lancaironline.net/lists/flyrotary/List.html