-----Original Message-----
From: John Hardy <hardwire@electract.co.uk>
To: Nick Wright <NickWright@sutton-publishing.co.uk>
Date: 17 May 2000 18:39
Subject: Re: Carburettor problems
>
>
>
>
>>Dear listers - can anyone help me?
>>
>>I have just completely refurbished the twin 1 inch SU carbs on my MG
>P-type,
>>but there are still some problems:
>>
>>1. The (brand new) float needle seems to be incapable of preventing the
>>float chamber flooding. When the petrol reaches the level of the overflow
>>pipe it pours out in short pulses, separated by one or two seconds. I have
>>tried replacing the float needles again with the old fashioned solid metal
>>type, but this has not improved things. It would seem that petrol pressure
>>is pushing down on the needle more strongly than the float is able to push
>>up. Could there be a problem with the (standard SU) pump?? This is the
most
>>serious problem and I would be very grateful for an answer...
>
>I think that probably dirt is in there somewhere. This has happened to me a
>few times
>>
>>2. The left hand carb whistles loudly when idling. I guess there is a tiny
>>air leak somewhere - any ideas?
>>
>
>That depends.......is a recognisable melody. Broadway show tunes perhaps?
>
>>3. The engine runs too fast (about 1500 rpm) when both carbs are fully
shut
>>off. They have new spindles, bushes, butterflies - everything, and the
>>pistons are both seating properly...
>
>I think that this may be a result of your warbling carb. Air getting in. Is
>the piston sitting too high? I've come across carbs with the mounting
flange
>warped before now.
>
>
>May the motoring deities guide your contrivances.
>
>John Hardy
>www.electract.co.uk
>www.brakedrum.co,uk
>
>
|