IMHO,
Was the engine running OK in its previous home? Have you checked that the main
jets are not partially obstructed? Is the carb linkage adjusted for its full
travel? Sounds like a little bit of fuel starvation at the more sporting RPM's.
If the engine hadn't been run for a while, there may be some lacquer build up
in the carbs. If so a bottle of carb cleaner in the fuel tank will clear it out
in a
tankful. Good Luck.
Jim
James Nazarian wrote:
> Bcc:
> Subject: Re: High RPM miss.
> Reply-To:
> In-Reply-To: <20001101.161834.-351631.2.dmeadow@juno.com>; from
>dmeadow@juno.com on Wed, Nov 01, 2000 at 04:18:31PM -0600
>
> it seems improbable, but it could be that the throttle shaft on the carbs is
>worn and letting air in. I know when it happened to me that my car would run
>perfectly some days and not at all others. Sometimes when it ran it would
>also start running like s!@# and then cure itself. Yours may just get pissy
>about a certain throttle position. Best check is to try and wiggle the
>throttle shaft AFAIK.
> On Wed, Nov 01, 2000 at 04:18:31PM -0600, David Littlefield profoundly
>declared:
> > OK, folks, here's a puzzler that's been driving me crazy. Hopefully
> > someone out there can give me some things to check.
> >
> > I've installed a 1967 MGB motor in my MGA MkII. I just can't get it to
> > run properly.
> >
> > It will idle great and will accelerate fine up to about 3000 rpm in first
> > gear. It then starts to bog and miss. It will do this a little later on
> > the rpm curve in each of the gears. By the time I get to fourth gear, it
> > bogs and misses around 4500 rpm.
> >
> > So far I've been through the entire fuel system:
> >
> > New pump (for other reasons).
> > Blown through all the fuel lines and checked the tank for debris.
> > Changed fuel filter.
> > New points and condensor, swapped out coils. New spark plug wires and
> > cap, swapped these out with old ones just to check 'em.
> >
> > I've adjusted the carbs using a Uni-Syn and a Colourtune.
> >
> > Any suggestions or (wishfully) magic bullets?
> >
> > David Littlefield
> > '62 MGA MkII
> > '51 MGTD
> > '74 MG Midget vintage racer
> > '88 Jaguar XJ-S
> >
> > ________________________________________________________________
> >
>
> --
> James Nazarian
> 71 MGB roadster
> 71 MGBGT (the one that is supposed to be a v8)
> 01 Impreza 2.5RS
>
> "Given a conflict, Murphy's law supercedes Newton's."
> -Anon
>
> "Nothing good has ever been reported about the full rotation
> of a race car about either its pitch or roll axis."
> -Carroll Smith
|