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RE: fixed leaky carbs - and strange power throb

To: "'Spitfires'" <spitfires@autox.team.net>
Subject: RE: fixed leaky carbs - and strange power throb
From: "Catchpole, Pat" <Pat.Catchpole@ntc-europe.co.uk>
Date: Tue, 16 Oct 2001 09:36:10 +0100
James

Hopefully you managed to check the needles in the carbs last night and found
that they are ABT (standard).  For use with K&Ns a good starting point is to
use AAQ needles.  These have the same diameter when at idle, but get thinner
as the piston / needle rises at higher revs, thus allowing more fuel to
flow.  You will also have to change the damper springs inside the carb body
to stiffer ones (red {4.5 oz} to yellow {8 oz} dot).  This is to give a
stable idle condition and to prevent the needle rising too rapidly during
acceleration.

This set up worked great on my car which also had a full sport exhaust.  A
standard exhaust will be more restrictive to airflow, so you may want a
slightly leaner needle such as AAT.

You will need to visit a carb specialist to get these needles I think, or
somewhere like Moss in South London who specialise in Triumph tuning parts.

Hope this is useful, let me know how you get on.

Pat

> -----Original Message-----
> From: James Carruthers [SMTP:jcarruthers@freenet.co.uk]
> Sent: Monday, October 15, 2001 4:26 PM
> To:   Pat Catchpole
> Subject:      RE: fixed leaky carbs - and strange power throb
> 
> OK. Ill wait until I can do it properly. Ill take the K&N carbs apart when
> I get home and see what the needles are. And Ill check out everything else
> too.
> 
> James
> 
> 
> 
> 


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