[TR] Overheating issue

[Rye Livingston]

I appreciate your comments on timing.  

Just so you know, the owner and 40+ year professional mechanic at British Motorsports, he checked the timing on the engine when I stopped by with the newly serviced radiator last week.  He is the one who rebuilt and tuned the SU carbs during the engine rebuild last year, so all the jets and needle values were examined and/or replaced..  The car is running really well.

The new 1" deep cap I bought yesterday is a more snug when screwing it on so I'm feeling it's been the problem.  I'm hoping to go for a drive later today when it's supposed to be around 96 degrees and see what happens.

Rye
PH: 530-FIND-RYE

On Jun 21, 2017, at 04:49 AM, Randall <TR3driver at ca.rr.com> wrote:

  Incorrect timing.


Freshly timed last week

Not to belabor the point, but there is a lot more to timing than just the
usual initial ignition timing adjustment. There are two different
mechanisms that dynamically adjust ignition timing to suit current
conditions; either one can go wrong. Valve timing is also important.

Same thing applies to the mixture adjustment; the book procedure assumes
that all is well with the carbs and setting mixture at idle will result in
correct (more or less) mixture under all conditions. I've seen some very
persistent overheating problems that were caused by the jet and/or needle
being invisibly worn, causing the mixture to go rich at idle. Then when
adjusted by the book, the idle mixture gets corrected, but the mixture at
higher rpm is too lean.

Any kind of modification, like tubular exhaust or modifying the carbs "for
better flow" can cause the same problem.

-- Randall

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