MG Sports Cars

engine swaps and other performance upgrades, plus "factory" and Costello V8s

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pcmenten
Paul Menten

(242 posts)

Registered:
10/08/2009 10:40AM

Main British Car:
Re: Carb for 2.8l V6
Posted by: pcmenten
Date: October 19, 2011 02:18PM

Fred, thanks for clarifying that for Ron.

Ron, 'ported vacuum' would be a vacuum signal connection that is between the throttle blade and the venturi. As the throttle is opened a pressure drop is created. At idle, when the throttle blade are almost closed, there would be nearly no pressure drop.

It might take a little work to get that signal conditioned properly. On a S10 (with the Isuzu engine) that I once drove, there were vacuum signal delay devices in the vacuum lines to improve the timing of the vacuum signal. It would be easy to see how an immediate change in spark timing might cause a stumble in off-idle operation, and a vacuum delay device might help that.


BMC
Brian Mc Cullough
Forest Lake, Minnesota, USA
(383 posts)

Registered:
10/30/2007 02:27AM

Main British Car:
1980 MGB '95 3.4L 'L32' SFI V6, GM V6T5 & 3.42 Limi

authors avatar
Re: Carb for 2.8l V6
Posted by: BMC
Date: November 19, 2011 09:50PM

Ron,

I am a little late. I was going to recommend the CCE 4 barrel lower profile adapter.

It would be Great to see photos of your final results.

It sounds like the stumble is ignition or accelerator pump. Knowing enough about webers, I would check the accelerator pump first. Some of the webers even have an adjustable accelerator pump cam/rocker to allow for more fuel on depressing the throttle.

-BMC.
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