REFLECTOR: Sans Turbo

[Scott Derrick]

Kurt,

I'm pretty sure I'll be flying early summer.  Belen is one of my phase
one airports so I'll be stopping by when I'm working any kinks out.

Scott

nmflyer1 at aol.com wrote:
> Scott,
>
> As long as you are happy (or as close as you can get). Might be the
> best bet in the long run, and you certainly don't need the extra
> weight & heat.
>
> Clinton built my Velocity exhaust (from my molds & flanges) as well as
> the ones on my Cherokee. They do FINE work ad a very reasonable
> price.. and they are fast!  Thanks for turning me on to them years ago!.
>
> I still need to get up there and see your machine, but I am just out
> of time. I'll see what I can do though.
>
> Keep on plugging.
>
>  Kurt
>
>
> -----Original Message-----
> From: Scott Derrick <scott at tnstaafl.net>
> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
> Sent: Tue, 21 Apr 2009 7:43 pm
> Subject: REFLECTOR: Sans Turbo
>
> Well I have decided to finish this engine upgrade without the turbo.
>
> After removing the engine last week to fix a pesky oil leak in the oil
> pump that showed up after about 4 hours of run time(go figure).  I also
> just had to redo some of the intake tubes that I never liked, since I
> had the engine off.....  I got the engine reinstalled today without the
> turbo. 
>
> Everything else is still somewhat installed, wastegate, controller,
> intercooler, oil lines, etc....  I removed the ducting from the
> intercooler so the engine is breathing normally.
>
> As the local A&P/IA told me, it ran just fine.  It was running very
> rich, since it didn't have to pump the air through the intercooler, but
> sounded good and ran up fine with just a tad of leaning of the
> mixture.   Using the prop made for 325 HP the WOT static rpm was
> pathetic!  As expected.
>
> I talked to Catto, and he will re-pitch the prop for 275 HP,  you get
> one free repitch as part of the purchase price of any of his props.  I
> have to make a box and ship it back for the mod in asap.
>
> Clinton at Custom Aircraft Parts is fabricating a new exhaust.  This is
> his first for a continental 470/520/550 install in a Velocity, so he
> will build a jig for any further orders.  They are $725, for a 3-into-1,
> both sides.  If you look on his web site you will see one for the IO540
> on an XL, which is the same style I'm having made.
>
> I will save all the pieces of the turbo install and re-evaluate after
> its flying with just an IO520.
>
> It certainly won't be as fast, but 275 HP in a STD RG, should get up and
> move.  It was no slouch in cruise with the IO360 I had in it, it just
> used way to much runway up at 6500 ft.  It will be considerably more
> fuel efficient non-turbo'd below  14/15K.  I'm not sure where in
> altitude the cross over happens where a TSIO starts to outperform an IO
> engine in fuel burn.
>
> Sorry to all the hot rodders that were looking forward to a blazingly
> fast STD V.  My local A&P is not a happy camper!
>  
> Scott
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