[Mgs] Acceleration problem

[Hans Duinhoven]

Something with fuel starvation perhaps?
In your list I did not see you have replaced the fuel filter.

Cheers,

Hans

71 BGT

----- Original Message ----- 
From: "Pat Leask" <pleask at shaw.ca>
To: <mgs at autox.team.net>
Sent: Friday, August 10, 2007 5:56 AM
Subject: [Mgs] Acceleration problem


> My 1800cc motor runs flat at a specific spot when accelerating and I've 
> run
> out of ideas.. HELP!
>
> I know this is an MG list, but I have a 1964 TVR Grantura that runs a MGB
> 1800cc motor and trans. So I am appealing to your collective wisdom on 
> this
> problem if I may. I got this car about a year ago after it sat for 6 years
> and was not driven and was 100% stock, never seen a DPO. I have "Spiffed" 
> it
> up, replaced all brakes and so forth and the motor idles very smooth and
> strong.
>
> The problem is when accelerating it goes fine until ONE SPECIFIC SPOT 
> where
> it flattens out. Speed is maintained but no more acceleration, you can 
> hear
> and feel it wanting more of something, like a high speed miss. There is a
> "Sweet spot" on the throttle where it will or will not do this, very
> definitive.
>
> Here is what I have done and can verify:
>
> The timing is spot on
> When I suck on the hose to the Dizzy I can see the plate advance
> The shaft of the dizzy is not bent
> There is good suction on the intake manifold
> Changed spark plugs from new Champion to new Bosh (Told Champion can have
> problems) at .025
> Plugs are a nice colour, good mix of fuel/air
> Carbs are rebuilt (new jets)
> Needles are "MB" (standard)
> Pots seem to rise and fall okay.. Not fully sure on this
> Light oil in carb dash pots
> New electric fuel pump
> New points .015
> New condenser (after a new one, thought defective but not)
> New plug wires
> New Lucas Sports Coil (Gold one) tried another coil same results
> Gas tank cleaned, no obstruction in supply line
>
>
> The only thing left I can think of is a Pertronix unit or different jet
> needles. What really bugs me is the "Sweat spot" where it craps out on me
> thoughts please?
>
> Thanks, Pat
> Victoria BC