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Re: [Spridgets] SU Question - Accelerator Pump Question

To: "Spridget List" <spridgets@autox.team.net>
Subject: Re: [Spridgets] SU Question - Accelerator Pump Question
From: "David Lieb" <dbl@chicagolandmgclub.com>
Date: Tue, 24 Feb 2009 16:23:21 -0600
> You also can change damper springs.

But that changes different parameters. A stiffer spring means that the carb 
requires more airflow to open the dashpot fully. A softer spring means that 
less airflow is required. This has more to do with calibrating the carb for 
the displacement and rpm of the intended application than it does with 
compensating for lean spots under acceleration. Changing the spring also 
means that your needle is now wrong for your application, whether it was 
right with the other spring or not. These are very simple carbs; the only 
complicated bit to them is the needle. The factory put a lot of work into 
getting the needle right for the application. The moment you change the cam 
profile, the compression ratio, the exhaust header, etc, you have now 
guaranteed that the needles in your carbs are no longer optimal for YOUR 
engine. Getting them right again can be a long and tedious operation 
involving more art than anything else.
David Lieb 
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