Hi all
I'm just about to replace the float needles with a new Burlen kit (along with fitting unsinkable foam floats as a precaution against ethanol after the solder on one of my brass ones gave way - on E5...). I've taken the first old one out and two interesting points. Firstly the tip on the old one looks to be intact but has stretched/lifted slightly from the needle. Second, and i've measured this a few times, the new one is shorter by 0.5mm overall. Put together this will mean the valve is closing with the fuel level about 1mm higher than before. I don't know how sensitive this is - the arms are set to the correct 7/16". Will I need to retune the carbs/reset the base of the jets?
Cheers
New SU float needles and seats
#1 New SU float needles and seats
3.8 OTS 1964
Original RHD. Close ratio moss box
Original RHD. Close ratio moss box
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#2 Re: New SU float needles and seats
IMHO Highly unlikely to need alteration of float height, for these reasons :
1. 1mm is less than a 10% alteration in the depression of the float at shut off ( and a much smaller percentage of the mean "altitude" of the float above jet level
2.The buoyancy of the new floats is likely to be different from the original copper ones ( certainly that seemed to be the case with the ones I fitted to my Daimler 2.5)
3. It is virtually impossible to achieve a resetting to an accuracy of +/- 1mm
1. 1mm is less than a 10% alteration in the depression of the float at shut off ( and a much smaller percentage of the mean "altitude" of the float above jet level
2.The buoyancy of the new floats is likely to be different from the original copper ones ( certainly that seemed to be the case with the ones I fitted to my Daimler 2.5)
3. It is virtually impossible to achieve a resetting to an accuracy of +/- 1mm
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#3 Re: New SU float needles and seats
I'm with Christopher.
Just check that you have the float lever height set correctly. The jets should be fine.
Just check that you have the float lever height set correctly. The jets should be fine.
Andrew.
881824, 1E21538. 889457. 1961 4.3l Mk2. 1975 XJS. 1962 MGB
http://www.projectetype.com/index.php/the-blog.html
Adelaide, Australia
881824, 1E21538. 889457. 1961 4.3l Mk2. 1975 XJS. 1962 MGB
http://www.projectetype.com/index.php/the-blog.html
Adelaide, Australia
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