Hmmm, interesting! You say the engine pulls to 7000. Did you have to
do anything with crank balance to get rid of the infamous bad
vibration period around 6000-6200 with the 2.5 liter engine? Also,
what did you do with the tolerences? What about valves, ignition etc.?
You see, I'm wondering, being a California resident, if I could do
some of the same things when the inevitable engine rebuild time comes
without upsetting emissions to the point where the car wouldn't be
drivable on the street anymore.
Thanks,
Jim
______________________________ Reply Separator _________________________________
Subject: RE: Engine oil weight - TR3
Author: "Scott Stacey (Prince George)" <SSTACEY@sierrasys.com> at smtpcc1
Date: 11/22/96 9:39 AM
18 years ago I had that problem with my TR6 too. For old tired engines
20W-50 is like a "walker". On the other hand, I rebuilt the engine
recently and spent a little time crafting the tolerances. I broke it in
(200 miles on 10W-30 mineral based) and then switched to Syntech 5W-50
synthetic. Oil pressure is now never lower than 45 lb. and never higher
than 70 lb.. Engine pulls well to 7000, I get better gas mileage and
more horsepower. Synthetic oil is great and for new/rebuilt engines, its
like dancing shoes.
>----------
>From: Robert J Carley[SMTP:rcarley@uoguelph.ca]
>Sent: Friday, November 22, 1996 9:19 AM
>To: Barry Schwartz
>Cc: triumphs@autox.team.net
>Subject: Re: Engine oil weight - TR3
>
>I agree with the 20W-50 weight for TR's. I changed oil soon after
>acquiring my TR6, used 10W-30, and wondered what had happened to my
>motor! The oil pressure had dropped considerably. The british car
>dealer/ restorer from whom I had purchased it told me to switch back to
>20W-50, as that was the original weight of oil recommended for these
>cars. I did, and have had excellent oil pressure since.
>
>Robert Carley
>73 TR6 CF5713U
>
>On Fri, 22 Nov 1996, Barry Schwartz wrote:
>
>> > using a multi-viscosity oil is superior to any straight weight. I would
>> > use either a 5w-30 or 5w-40. If you do decide to take it for a spin on
>> > one of those snow free days, the 5w will allow the engine to spin more
>> > freely.
>> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>> While I agree with using the newer improved, multi-grade oils, I disagree
>> with the choice of weights. Remember when theese cars were built. The
>>only
>> oil available was of the single grade variety. The clearances built into
>> these engines were such as to accommodate these oils. Newer engines are
>> built and designed with much tighter/closer tolerances which take advantge
>> of these new and better oils as well as thinner grades. If you use the
>> thinner multi-grade oils, you will not have the proper oil pressure your
>> engine was designed for. There is nothing wrong with a good grade of
>>single
>> weight, but if you want to use the "better" multi-weight I would recommend
>>a
>> minimum 20w-50. 5w is much too thin - and I think you'll find in your
>> owners manual the viscosity for your car at whatever temp. Use a
>> multi-grade that falls within these ranges.
>>
>> Barry Schwartz
>> Bschwartz@encad.com (work)
>> Bschwart@pacbell.net (home)
>> (San Diego)
>> 70' Spitfire (under-going major surgery) , 72'-V6 Spitfire (daily driver)
>> 70'GT6+
>>
>>
>
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