On Wed, 5 Jul 1995 MarvinCX2@aol.com wrote:
> On my 67 MGB, I set the ignition statically (sp?). I am pretty confident
> about the job I did there, the timing is set to spec. I am now getting about
> 27.5 mpg on the highway at 70 mph in with the overdrive on. Now here's the
> question. In 2nd and 3rd gear, under hard acceleration, I get knocking at
> 4000 rpm and above (actually I think the tach reads high, but it says 4000
> when the knock starts). My distributor was suposedly rebuilt about 2 yrs
> ago, so the weights and springs should be good (that is if I trust my
> mechanic, which I do). Should I retard the timing from the spec., should I
> live with the noise, or should I check my mechanic's rebuild job? The engine
> has not been overheating while running at highway speeds, so I am not too
> concerned yet, just really annoyed with the knocking. Anyone have
> suggetions?
>
What grade fuel are you using? I find I have to run 92 octane or better
in my 73. I do tend to run a degree or two advanced from spec but no
more. It knocks quite noticably on 89 octane.
I'm jealous of your gas mileage, though. (non-overdrive here).
John M. Trindle | jtrindle@tsquare.com | Tidewater Sports Car Club
'73 MGB DSP | '69 Spitfire E Stock | '88 RX-7 C Stock
Home Page: http://www.widomaker.com/~trindle
"Life's a banquet and some poor beggars are starving to death - Auntie Mame"
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