You might check for debris in the exhaust system that is causing back
pressure as the speed increases.
Two years is plenty of time for mice to make a nest in your exhaust
system. They do that, you know!
Joe
"Amatruda, Andy" wrote:
>
> After several annoying misfortunes after rebuilding the engine I finally put
> the car up on the Highway. Almost all of the vibration experienced
> previously is gone due to 1) balancing the wire wheels at a business that
> actually knows how to do wire wheels correctly and 2) balancing the
> driveshaft. However a couple minutes of highway speed brought on
> backfiring/sputtering through the exhaust with a significant loss of power.
> When I got off the exit and resumed city driving it seemed to "recover".
> Checked under the bonnet; everything seemed OK. Went back home and the same
> thing happened (I could barely maintain the speed limit).
>
> Things to consider:
>
> The car hadn't been driven for 2 years during the rebuild (carbs were
> rebuilt a few years earlier)
>
> The engine has less than 100 miles on it
>
> The gas, although it has stabilizer in it is also about 2 years old
>
> I suspect a fuel delivery problem. I seem to recall a thread about setting
> the floats in the bowls. I have installed Grosse Jets and have never felt
> that setting up the floats per the manual is giving the desired result so
> this may be a problem. Anyone have any comments here?
>
> I'm going to replace my in-line fuel filter a lunch to see if that is
> creating a restriction. What else should I check?
> Regards ..... Andy
>
> Andy Amatruda
> Senior Member Technical Staff
> AS&C, M&C
> aamatruda@ti.com
> (508) 236-3219 phone
> (508) 236-3586 fax
--
"If you can't excel with talent, triumph with effort."
-- Dave Weinbaum in National Enquirer
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