spitfires
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Re: SU jets question

To: "spitfires@autox.team.net" <spitfires@autox.team.net>
Subject: Re: SU jets question
From: "alemen@pop.ftconnect.com" <alemen@pop.ftconnect.com>
Date: Fri, 1 Sep 2000 15:58:16 -0400
Ken, I have a pair of HS4 that I plan on rebuilding and have the kit for them. 
Since the carbs were orininally waxstat they had been previously converted to 
the eraly style jets. Enough of this but the interesting thing I noticed is 
that they are marked by means of a white or black band round the spiral of the 
jet feed line. Apart from being mirror images for the fitting this is the only 
other means of identification. Nothing about these coloured band is mentioned 
in the documentation I have. Assuming that your HS2 are similar then you may 
also have the bands. Also with the physical differences (mirror image) you 
can't really get it wrong anyway.

Alan

Original Message:
-----------------
From: Ken Strayhorn ken@dukecomm.duke.edu
Date: Fri, 1 Sep 2000 14:52:37 -0400
Subject: SU jets question



Friends -

I have a '72 MkIV that has twin SU carbs installed,
allegedly from a '70 model. They are impossible to
tune and I'm thinking that the jets are incorrectly
installed.

Fortunately, the DPO left a couple carb rebuild kits
in the trunk - but no indication of which goes on
the front and which goes on the rear. They are just
in boxes that say "Lucas rebuild kit" (yep, Lucas).

Using a pin gauge, I've discovered that the jet hole
(where the needle goes after it's all assembled) is
smaller on one than the other. Does the smaller jet
go on the rear, or the front?


Thanks for any help,

Ken Strayhorn
Hillsborough NC








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