What about the fuel pump? Although an SU ticks, it may not supply
pressure under load, starving the engine.
It may explain the problem if the pump was not checked over.
I've got a similar problem with the 79B I'm working on. Sat for 6
years. After cleaning the points the pump works fine dry, but will not pull
any suction when installed in the car.
> -----Original Message-----
> From: Max Heim [mailto:email@example.com]
> Sent: Monday, September 10, 2001 9:58 AM
> To: MG List
> Subject: 69 B tuning -- what are we missing here?
> I've been helping my buddy try to get his 69 MGB "barn car"
> running, and we
> are a little puzzled at this juncture, and looking for
> suggestions. Here's
> the situation:
> 1969 MGB roadster, in storage with a cracked head 1974-2000.
> New head, air
> injection holes plugged, air pump removed. Valves adjusted.
> Good compression
> and oil pressure. Carbs rebuilt and bushed.
> We have gone through the tune-up steps and carb set-up, and
> believe the
> timing is correct and the carbs synchronized and the mixtures
> correct. It
> idles very smoothly from as low as 650 to 1200 and above, and
> seems to rev
> freely when you blip the throttle. But when you go for a test
> drive, it has
> no power under acceleration, and while the engine doesn't
> exactly get rough,
> it sounds a little off (although hard to pin down because the
> bonnet has
> been removed).
> We are thinking that perhaps having removed the air pump and
> smog equipment,
> the carb needles could be incorrect? Or perhaps it's still a
> timing issue. I
> should mention that it has a Pertronix ignition unit.
> One anomaly with the car is that it was hard to set the
> timing, because the
> timing marks were not visible behind the balancer, as if the
> little pointer
> prongs had been bent back. I managed to bend the large TDC
> pointer up so
> that it was visible, but the two or three smaller pointers
> don't seem to
> extend far enough to clear the rim of the balancer. Anyone
> with this vintage
> of B have any advice on this issue?
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