According to R&T road tests of the period, the original unsmogged engine
had 107ft/lbs torque at 3500rpm; the first air injection SU models went
to 110ft/lbs @ 3000rpm, and the 1973 had 94ft/lbs @ 3000rpm. The
differences seem to be predicated on carburetion, timing, and emissions
control. Note that the latest model had the least torque, at the lowest
rpm. Weber aside (which I can't speak to, except to note that it is not
considered a performance enhancement vis-a-vis SUs so much as a
driveability improvement), it would seem to behoove you to see if you can
tune your car to resemble the earlier unsmogged models. This may require
a different distributor advance curve, I would guess, and I'm not sure
what else. I suppose it's possible that your distributor or your cam and
the DGV are not complementary. But I'm no expert on tuning, just trying
to suggest some possibilities...
Mikecquinn@aol.com had this to say:
>I'm not sure I made my question clear. My 'B really runs well it just seems
>to me like at all the pulling power is below 3500 RPM's. It doesn't back
>fire
>or stutter above 3500 it will rev to 6K with no problems. It just doesn't
>feel like I think it should, It seems to run out of tork. Is this normal or
>do I have a problem?
>Thanks in advance again.
>--Mike
>
--
Max Heim
'66 MGB GHN3L76149
Runs great,
looks particularly bad since some SUV clown backed into it.
If you're near Mountain View, CA,
it's the red one with the silver bootlid.
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