I not a petro-engineer either, however Chris staggered around in little
cirles with his hands in the air, sort of Quasimodo without the bells, when
I told him I was still on gear oil. I don't think that the viscosity is on
an absolute scale, i.e. 90 is not 3 times thicker that 30, but I do believe
it is considerably more viscous than straight motor oil. There is a rather
learned article in the VTR maintenance pages written by a petro-type. I
haven't the time to check it out now, but there it is.
Mark
-----Original Message-----
From: Tom Rollins <tom@ntcs-inc.com>
To: 'gbuck@pinnaclegrp.com' <gbuck@pinnaclegrp.com>
Cc: 'triumphs@autox.team.net' <triumphs@autox.team.net>
Date: November 19, 1998 5:50 PM
Subject: RE: TR6 transmission oil
>
>Gordon,
>I am not the authority on this but I think that gear oil and engine oil
>viscosities(sp?) are measured differently. I think that 80W or 90W gear
oil
>is similar in viscosity to 30W engine oil. I believe that their are other
>differences (friction modifiers?) that effect the way that the oil climbs
>the gears, and I am sure there are other differences as well. I would love
>to hear more on this as I am kind of fuzzy on some of this myself.
>
>Tom Rollins
>1969 GT-6+
>1972 TR-6
>1974 Europa Special
>tom@ntcs-inc.com
>
>
>
>-----Original Message-----
>From: gbuck@pinnaclegrp.com [mailto:gbuck@pinnaclegrp.com]
>Sent: Thursday, November 19, 1998 4:06 PM
>To: triumphs@autox.team.net
>Subject: TR6 transmission oil
>
>
>
>I picked up the latest issue of Practical Classics at the newstand
yesterday
>and ran across a little item that I thought I ought to ask the list about.
>Under letters to the Editor there is a question about 80W/90EP gear oil vs.
>20W/50 engine oil use in the transmission. Apparently this place "Chestnut
>Classics" recommends using the 20W/50 engine oil in the trans for "improved
>gearchanging and giving the unit an easier life" even though the factory
>recommended the heavier oil. Anyone have any experience or "opinions"
about
>this?
>
>Another item of interest for TR5/6 and 2500PI owners is a new electronic
>fuel injection system developed by Chestnut Classics of Barnack, Stamford,
>Lincs (01780 740945). Main components are Bosch electronic fuel injectors,
>a modified BMW fuel manifold with pressure relief valve, fuel pump and
>electronic control unit (ECU). Original TR P.I. manifolds and linkage are
>retained. It's kind of pricey at 1,500 British Pounds (about $2,500), but
>still fun to think about. Anyone familiar with Chestnut Classics?
>
>Gordon Buck
>Sultan, Washington
>71 TR6 CC62806
>67 MGB GT
>
>
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