[s-cars] installing a hybrid turbo

[Mark Strangways]

Translation please !
----- Original Message ----- 
From: "Pasqualoni, James E" <james.pasqualoni at gs.com>
To: "Joshua van Tol" <josh at spiny.com>; "Audi S Car List" 
<s-car-list at audifans.com>
Cc: <pkrasusky at ups.com>
Sent: Tuesday, August 01, 2006 2:40 PM
Subject: Re: [s-cars] installing a hybrid turbo


> "Awww, come on guys, it's so simple maybe you need a refresher course.
> Heyya! It's all ball bearings nowadays. Now you prepare that Fetzer
> valve with some 3-in-1 oil and some gauze pads, and I'm gonna need 'bout
> ten quarts of anti-freeze, preferably Prestone. No, no make that Quaker
> State."
>
> Sorry-couldn't resist.
>
> -----Original Message-----
> From: s-car-list-bounces at audifans.com
> [mailto:s-car-list-bounces at audifans.com] On Behalf Of Joshua van Tol
> Sent: Tuesday, August 01, 2006 2:08 PM
> To: Audi S Car List
> Subject: Re: [s-cars] installing a hybrid turbo
>
>
> On Aug 1, 2006, at 9:31 AM, Postupack, Jeff wrote:
>
>>
>>
>> Further to what  Dave wrote..
>>
>> I consulted with a machinist who worked in the aircraft business his
>> entire life.
>> Having seen ball bearings, bushings in various applications.he told me
>
>> .
>> "A journal bearing  is a cylinder which surrounds the shaft and is
>> filled with some form of fluid lubricant Journal bearings can have
>> unlimited life, compared to a ball bearing."
>> ->. For the more complete write up, seek
>> http://www.reliabilitydirect.com/appnotes/jb.html
>>
>> He (the machinist)  also commented that journal bearings are much
>> tighter tolerances composed of particular material much better suited
>> to the Hot side and cold side of the turbo charger.,  than a ball
>> bearing will ever be.
>>
>> All the fascination with ball bearings may be misguided for a long
>> life expectancy,  turbo application.
>>
>> Truth be told a journal bearing can be machined to very close fitment,
>
>> which means the shaft will not wobble.
>> Isn't that what the Audi R&D actually specified also?
>>
>> Which means when I get around to selecting a turbo, for long life and
>> higher boost, it shall have a journal bearing.
>>
>> Posto
>>
>
> Journal bearings also have more friction, hence ball bearing turbos
> typically develop boost sooner, all things being equal.
>
>
>>
>> ------------------------------
>>
>> Message: 2
>> Date: Tue, 01 Aug 2006 00:48:31 -0400
>> From: djdawson2 at aol.com
>> Subject: Re: [s-cars] installing a hybrid turbo
>> To: calvinlc at earthlink.net, tedebearp at yahoo.com,
>> james.pasqualoni at gs.com
>> Cc: s-car-list at audifans.com
>> Message-ID: <8C8833CDFAF9FD8-D28-A04D at FWM-D43.sysops.aol.com>
>> Content-Type: text/plain; charset="us-ascii"
>>
>> 1) the journal bearing units are inexpensive
>> 2) I haven't seen the journal bearing units fail (genuine Garrett, not
>
>> ITS, etc...)
>> 3) I *have* seen many of the GT units fail
>> 4) if your hp goals are 400whp or less, why bother with a ball bearing
>
>> unit?
>> 5) a 50 trim allows a lot of boost at low rpm without surge issues
>> 6) the GT units seem to be much more prone to surge
>>
>> IMHO, there's a lot of trouble-free hp available from a 50 trim T3/T4.
>> Great drivability, low boost threshold, low cost.  In fact, the 50
>> trim compressor is about the most versatile thing I've ever
>> experimented with.
>>
>> OTOH, I run a 30R... but I wanted "more."  But, as a result of this
>> choice, I'm on turbo # 2 in 50k miles, and under certain
>> circumstances, I do have surge.
>>
>> Dave
>>
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>
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