Today's Message Index:
----------------------
1. 05:18 AM - Re: Turbo VS.. Supercharger again (Archie)
2. 07:05 PM - Re: turbo vs. super (Gordon and Marge)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Turbo VS.. Supercharger again |
--> Engines-List message posted by: "Archie" <archie97@earthlink.net>
> --> Engines-List message posted by: "AI Nut" <ainut@earthlink.net>
>
> I don't have any firm experience with this, but what I was told while
> "designing" my system that turbine speed is largely dependent upon the
mass
> of air passing through the engine so at altitude, you shouldn't have a
> problem. However, that is predicated upon whether you choose a turbo that
> is "larger" than your engine's needs. With the reduced resistance on the
> compressor side at altitude, it can spin faster. No one could give me any
> exact formulae for the resultants, but it the turbo is rated to at least
> 30-50% higher sea level speed than the engine can put out, you should
still
> be safe. For example, the T3 that I put on a 1.9L Ford engine is rated at
> about 150k rpm, but at sea level max, the 1.9L airflow will only push it
to
> between 80 and 100k, giving plenty of headroom.
>
> If it blows itself up once I get in the air, and do altitude testing, I'll
> be sure to retract my statement 8-).
>
> So nothing definitive, just a rule of thumb is all I have available.
>
> HTH,
> AI Nut
Do not believe you should be overly concerned with turbo failure.
I saw one catastrophic example, but that was due to the owner's
decision to do something I warned him about.
All turbos I have either repaired or rebuilt were based on wear.
The most common problem encountered was built-up carbon
deposits on the turbine section, which tends to pull the shaft
laterally, destroying the carbon seals and allowing lube oil
to enter. After a series of similar repairs for the local xxxx
dealer, determined that these were used by people on short
trips.(ie: Grocery shopping, etc) apparently not burning the
accumulating carbon off.
Archie
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
--> Engines-List message posted by: "Gordon and Marge" <gcomfo@tc3net.com>
-
Subject: Engines-List: turbo vs. super
--> Engines-List message posted by: "Fergus Kyle" <VE3LVO@rac.ca>
Cheers,
May I echo previous sentiments (especially 'Marge's')
regarding the exchage of views on the subject? As a Driver, Airframe, I
have enjoyed the byplay and learned much. I used to run Wright Turbo
Compound 3350's with the recovery turbines in 3's on each engine, and
when a broken exhaust valve stem went down the exhaust and met the turbo
blades an exciting and colourful event continued to landing............
This was not infrequent in Trans At service on Connies.
Engine Listers:
The 12/03 and 1/04 issues of Hot Rod magazine have continuing articles
on turbocharging that listers might find interesting. It is not
terribly technical but gives a pretty good overview along with photos of
components and assemblies. Given the development work done by the auto
industry (along with the auto aftermarket) many components such as waste
gate valves, popoff valves, intercoolers and the like are readily
available. Sizing, compressor/turbine matching are discussed and some
of the many variations on turbine wheel trimming are shown. They do not
talk about altitude considerations. Simple it ain't. Still may be the
most efficient method even if it is not the easiest to operate. Most
installations use fuel injection so the problems of drawing thru the
carb with its attendant volume of fuel/air that makes a backfire
somewhat unnerving are avoided. Computer management is popular.
Gordon Comfort
N363GC
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|