Converting engine from Turbo to non-Turbo

[Dick Kurtz]

looking at potential powerplants for my project I have come across a
TSIO- 520 that is mid time,
I am looking for an IO-520,
What exactly does it take to convert an engine to non-turbo? Do
higher compression pistons need to be installed? What of the
injection system? Anyone out there a powerplant mechanic who knows
his way around this issue???

Thanks in advance
Dick

[Roger Halstead]

On 29 Oct 2003 07:33:14 -0800, (Dick Kurtz)
wrote:

>looking at potential powerplants for my project I have come across a
>TSIO- 520 that is mid time,
>I am looking for an IO-520,
>What exactly does it take to convert an engine to non-turbo? Do
>higher compression pistons need to be installed? What of the
>injection system? Anyone out there a powerplant mechanic who knows
>his way around this issue???

First, I'm not a mechanic, but having a IO540 that was turboed at one
time...it will take a new set of high compression pistons along with
rings and a hone job.

The injectors are different, but "as_I_recall" you could use the
injectors from the turbo. They are pressurized when used with the
turbo.

There's bound to be some one on here who knows the details.

Roger Halstead (K8RI EN73 & ARRL Life Member)
www.rogerhalstead.com
N833R World's oldest Debonair? (S# CD-2)
>
>Thanks in advance
>Dick

[[email protected]]

On Wed, 29 Oct 2003 19:27:04 GMT, Roger Halstead
> wrote:

:On 29 Oct 2003 07:33:14 -0800, (Dick Kurtz)
:wrote:
:
:>looking at potential powerplants for my project I have come across a
:>TSIO- 520 that is mid time,
:>I am looking for an IO-520,
:>What exactly does it take to convert an engine to non-turbo? Do
:>higher compression pistons need to be installed? What of the
:>injection system? Anyone out there a powerplant mechanic who knows
:>his way around this issue???
:
:First, I'm not a mechanic, but having a IO540 that was turboed at one
:time...it will take a new set of high compression pistons along with
:rings and a hone job.
:
:The injectors are different, but "as_I_recall" you could use the
:injectors from the turbo. They are pressurized when used with the
:turbo.
:
:There's bound to be some one on here who knows the details.

The answer is simple - yes and no.

I don't know all the versions of the TSIO-520, so it depends on
whether it's turbo-supercharged or turbo-normalized. If, for example,
you're looking at the TSIO-520D off the V35TC Bonanza, it's
turbo-supercharged, and runs over 29" MP for full hp. It's
compression ratio is 7.5:1, and it makes 285 hp. The non-turbo
IO-520A makes the same 285 HP with 8.5:1 pistons.

There may be turbo normalized 520's - I don't know of any, but there
may be - that only run 29" MP maximum, and use the turbo to maintain
their hp to critical altitude. If that's what you're looking at,
unbolt the turbo and go fly. OTOH, 7.5:1 is a perfectly reasonable
compression ratio. If you were to unbolt the turbo from the 520D,
you'd give up some hp, but not that much. The O-320 A2B runs 7:1 at
150 hp, the B2C runs 8.5:1 at 160 hp.

If you do decide to increase the compression, Roger is right, it will
take new pistons, new rings and a hone.

You can certainly use turbo fuel injector nozzels unpressurized.

BTW, I probably won't be around much over the next few months, it
looks like I have a house to rebuild. If anyone knows of a good Cozy
project, I'm in the market, I haven't seen what's left of mine but
probably not much.

[Morgans]

> wrote in message ...
> On Wed, 29 Oct 2003 19:27:04 GMT, Roger Halstead
> > wrote:
>
> :On 29 Oct 2003 07:33:14 -0800, (Dick Kurtz)
> :wrote:
> :
> :>looking at potential powerplants for my project I have come across a
> :>TSIO- 520 that is mid time,
> :>I am looking for an IO-520,
> :>What exactly does it take to convert an engine to non-turbo? Do
> :>higher compression pistons need to be installed? What of the
> :>injection system? Anyone out there a powerplant mechanic who knows
> :>his way around this issue???
> :
> :First, I'm not a mechanic, but having a IO540 that was turboed at one
> :time...it will take a new set of high compression pistons along with
> :rings and a hone job.
> :
> :The injectors are different, but "as_I_recall" you could use the
> :injectors from the turbo. They are pressurized when used with the
> :turbo.
> :
> :There's bound to be some one on here who knows the details.
>
> The answer is simple - yes and no.
>
> I don't know all the versions of the TSIO-520, so it depends on
> whether it's turbo-supercharged or turbo-normalized. If, for example,
> you're looking at the TSIO-520D off the V35TC Bonanza, it's
> turbo-supercharged, and runs over 29" MP for full hp. It's
> compression ratio is 7.5:1, and it makes 285 hp. The non-turbo
> IO-520A makes the same 285 HP with 8.5:1 pistons.
>
> There may be turbo normalized 520's - I don't know of any, but there
> may be - that only run 29" MP maximum, and use the turbo to maintain
> their hp to critical altitude. If that's what you're looking at,
> unbolt the turbo and go fly. OTOH, 7.5:1 is a perfectly reasonable
> compression ratio. If you were to unbolt the turbo from the 520D,
> you'd give up some hp, but not that much. The O-320 A2B runs 7:1 at
> 150 hp, the B2C runs 8.5:1 at 160 hp.
>
> If you do decide to increase the compression, Roger is right, it will
> take new pistons, new rings and a hone.
>
> You can certainly use turbo fuel injector nozzels unpressurized.
>
> BTW, I probably won't be around much over the next few months, it
> looks like I have a house to rebuild. If anyone knows of a good Cozy
> project, I'm in the market, I haven't seen what's left of mine but
> probably not much.

Did I miss something? Did the fires get you?
--
Jim in NC

[[email protected]]

On Thu, 30 Oct 2003 16:43:12 -0500, "Morgans"
> wrote:

:
> wrote in message ...
:> On Wed, 29 Oct 2003 19:27:04 GMT, Roger Halstead
:> > wrote:
:>
:> :On 29 Oct 2003 07:33:14 -0800, (Dick Kurtz)
:> :wrote:
:> :
:> :>looking at potential powerplants for my project I have come across a
:> :>TSIO- 520 that is mid time,
:> :>I am looking for an IO-520,
:> :>What exactly does it take to convert an engine to non-turbo? Do
:> :>higher compression pistons need to be installed? What of the
:> :>injection system? Anyone out there a powerplant mechanic who knows
:> :>his way around this issue???
:> :
:> :First, I'm not a mechanic, but having a IO540 that was turboed at one
:> :time...it will take a new set of high compression pistons along with
:> :rings and a hone job.
:> :
:> :The injectors are different, but "as_I_recall" you could use the
:> :injectors from the turbo. They are pressurized when used with the
:> :turbo.
:> :
:> :There's bound to be some one on here who knows the details.
:>
:> The answer is simple - yes and no.
:>
:> I don't know all the versions of the TSIO-520, so it depends on
:> whether it's turbo-supercharged or turbo-normalized. If, for example,
:> you're looking at the TSIO-520D off the V35TC Bonanza, it's
:> turbo-supercharged, and runs over 29" MP for full hp. It's
:> compression ratio is 7.5:1, and it makes 285 hp. The non-turbo
:> IO-520A makes the same 285 HP with 8.5:1 pistons.
:>
:> There may be turbo normalized 520's - I don't know of any, but there
:> may be - that only run 29" MP maximum, and use the turbo to maintain
:> their hp to critical altitude. If that's what you're looking at,
:> unbolt the turbo and go fly. OTOH, 7.5:1 is a perfectly reasonable
:> compression ratio. If you were to unbolt the turbo from the 520D,
:> you'd give up some hp, but not that much. The O-320 A2B runs 7:1 at
:> 150 hp, the B2C runs 8.5:1 at 160 hp.
:>
:> If you do decide to increase the compression, Roger is right, it will
:> take new pistons, new rings and a hone.
:>
:> You can certainly use turbo fuel injector nozzels unpressurized.
:>
:> BTW, I probably won't be around much over the next few months, it
:> looks like I have a house to rebuild. If anyone knows of a good Cozy
:> project, I'm in the market, I haven't seen what's left of mine but
:> probably not much.
:
:Did I miss something? Did the fires get you?

Don't know yet. It got my neighborhood, but they haven't let us back
in, if the weather holds they'll probably allow it tomorrow. But it
doesn't look good - the voice mail picks up on the first ring, instead
of the 4th, so the phone's probably been melted.

[Del Rawlins]

On 30 Oct 2003 04:21 PM, posted the following:
> Don't know yet. It got my neighborhood, but they haven't let us back
> in, if the weather holds they'll probably allow it tomorrow. But it
> doesn't look good - the voice mail picks up on the first ring, instead
> of the 4th, so the phone's probably been melted.

Is it possible the power might be out? Good luck.

----------------------------------------------------
Del Rawlins-
Remove _kills_spammers_ to reply via email.
Unofficial Bearhawk FAQ website:
http://www.rawlinsbrothers.org/bhfaq/

[[email protected]]

On 31 Oct 2003 02:34:27 GMT, Del Rawlins
> wrote:

:On 30 Oct 2003 04:21 PM, posted the following:
:> Don't know yet. It got my neighborhood, but they haven't let us back
:> in, if the weather holds they'll probably allow it tomorrow. But it
:> doesn't look good - the voice mail picks up on the first ring, instead
:> of the 4th, so the phone's probably been melted.
:
:Is it possible the power might be out? Good luck.

No, it's voicemail, not an answering machine. Maybe if the phone
lines are down. But I just called my wife's cell phone, which she
*thinks* she left on, and it does the same thing.

We'll find out tomorrow. If the place is gone it's all right, we're
all fine and everything is insured. It's just a house.

[Bob Kuykendall]

Earlier, (Dick Kurtz) wrote:

> looking at potential powerplants
> for my project I have come across a
> TSIO- 520...

One thing to watch out for with the TSIO and TIO motors, is that they
often (at least, the ones I've seen) have the exhaust coming out the
upper side of the cylinder head, and not the lower side. That means
that you might end up with a funky exhaust system, and perhaps a funky
cowl. Also, it might make it harder or more expensive to get
replacement cylinders.

Also, and perhaps more important, most of these engines I've seen in
their natural environment are updraft-cooled, for example PA-31. It
might be that they work OK with downdraft cooling, but I'd bet that
with the exhaust on top it's going to be a bunch less effective, since
the exhaust manifolds will tend to pre-heat the air before it goes
through the cooling fins. That might not be the case, but it's
something to think on.

Thanks, and best regards to all

Bob K.
http://www.hpaircraft.com