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Date: Tue, 15 Dec 2009 08:41:11 -0500
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From: "Rick Titsworth" <rtitsworth@mindspring.com>
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Subject: RE: [LML] io-550 vs. tsio-550 differences?
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Subtle item, but the sniffle value is also different.
Also obvious, but not mentioned, the intercoolers and associated plumbing.

I can't imaging buying all the individual turbo items at TCM spare part
costs would be any advantage.  For example, the small sniffle value alone is
$1,000.

You'll also need a strategy/approach on the sonic nozzles.  Popular opinion
is that they are needed (required) for the waste gate to function properly
(dynamic response issue) and/or to prevent turbo stalls.  However, that
means you're likely just bleeding some pressurized (boosted) air overboard,
which is essentially wasted fuel economy.  


-----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Matt
losangeles
Sent: Monday, December 14, 2009 10:52 PM
To: lml@lancaironline.net
Subject: [LML] io-550 vs. tsio-550 differences?

Does anybody know the differences between the io-550 vs the tsio-550?

So far this is what I have determined:

io-550 8.5 compression vs tsio-550 7.5 compression
different fuel pump on tsio with aneroid and a reference port
different injectors with reference ports on tsio
tsio has a scavange pump lines and turbos.
different exhaust obviously
tsio has wastegate and fancy expensive stuff to control it
tsio has a different throttle body part#

The reason I ask is I am trying to create a turbo normalized io-550 and I am
not sure if I should get an io-550 core and add the tsio fuel pump,
injectors, scavange pump and turbos.
I could also get a tsio-550 core and put different pistons/cylinders on it.
I suspect the cylinders are the same and the pistons are the only
difference.

I also talked with Continental about this and supposedly the throttle body
is different between the two but they could not say why. Only that they had
different part#'s. They did say that something as simple as a 45 vs. a 90
degree fitting or different color paint can cause a different part# with
their stuff so there is a chance that the throttle body on the two is
mechanically the same. I was wondering if anyone knew the differences
between the two.

Also, which core would likely be the better to get, io-550 or the tsio-550.

This engine is going on a Legacy so I am comparing the io-550G or N vs. the
tsio-550c.

Thanks for any info you might have on this.

Matt


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