Hello Listers:
I am very interested in this issue of response with different weights of
oil. Following the thread on dashpot oils- Since '68 I've always used 3 in 1
oil in my Stromberg carbed TR4. I've always been conscientious about
checking dashpot oil level and rarely have ever found the level completely
'non-existant'-although I have found that diaphram condition would effect
the relative level.
When hesitation or sputtering occurred which, when studied, was NOT related
to choke setting when the engine was cold, I usually found replacing the
weakened diaphragms solved the problem.
I also remember that the race tuned TR-4's specified NO OIL in the
dashpots.
Of course we are talking fine distinctions here, and saying that, If I am
interpreting the posts correctly so far, a heavier weight of oil (in warm
weather-lets say 80-100^ OAT), will give a better 'immediate' acceleration
when throttle is applied, but the lower weight oil will provide a 'smoother'
acceleration across the RPM range as one increases RPMs. So if I was
planning to take the car for a 'rally' around country roads-I would choose
straight 40 WT to induce a 'spirited' response, but if I were to be in and
out of 'stop and go', city, or an 'interstate' drive where smoothnesss and
minimal 'startling' experiences are expected, then 3 in 1, 20WT, marvel
mystery, ATF, or 10-30 would be more appropriate.
Sherman D. Taffel
TR4 CT50045L
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