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Date: Mon, 14 Dec 2009 22:52:26 -0500
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From: Matt losangeles <mattinlosangeles@yahoo.com>
Subject: io-550 vs. tsio-550 differences?
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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