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iggy
December 2, 2017, 6:14pm Report to Moderator
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Hi all i have a pair of su hs6 carbs fitted to my mk2 2500 and been asked the question what size is the venturi of these carbs i presume its 1 3/4" or 45mm am i correct? thanks


1972 Mk2 2.5 PI on carbs
2005 Fiat Stilo jtd                                              
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Spitfire6
December 2, 2017, 10:01pm Report to Moderator


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Hi,
From Wiki:
************
To determine the throat size from the serial number: If the final number (after one, two or three letters, beginning with H) has 1 digit, multiply this number by 1/8", then add 1". For example, if the serial number is HS6, the final number is 6: 6/8 = 3/4", add 1, total is 1-3/4", etc.
************

Cheers,
Iain.


Me in Burnley, GB
Spitfire 6 EFI Alpha N (Emerald K3 ECU). Big fat 215/40/16's on the backside. (They fit and minimal camber change). (Custom cooling system); broken and going back to OEM,  with 20% EG for winter with 2% corrosion inhibitor. LED's all round. NT 5W40 Oil. 0W40 Mobil 1 FS, 3.27 diff with a LSD by Quaife. TR6 Transmission + J Type.

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G6SBH
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iggy
December 2, 2017, 10:17pm Report to Moderator
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ok thanks Ian any idea where the serial no is stamped on the su carbs


1972 Mk2 2.5 PI on carbs
2005 Fiat Stilo jtd                                              
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cliftyhanger
December 2, 2017, 10:23pm Report to Moderator

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Another method is the number of attachment bolts/studs to the manifold.
4 is HS6
2 on a diagonal is HS4
2 vertical HS2
There are obviosly other carbs, 1 1/8, 2" and so on, but he above covers the vast majority


Clive Senior

Location-Brighton, East Sussex
Foxy is here, 1500od tax exempt Toledo. Now has the decent engine back in Slant 4 engine bolted in, sprint box and axle.Now has fresh MoT. Needs paint though.
Spitfire Zetec project is started work progressing slooooowly on the road!
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Nick Jones
December 2, 2017, 11:25pm Report to Moderator

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HS6 is 1 3/4" by definition.

Nick


Nick Jones
Somerset UK

Vitesse Mk 1.5 Convertible EFI, Survivor of RBRR 2008, HCR & 10CR 2009, HCR 2010, 10CR2011, HCR 2012, 10CR2013, 10CR2015, HCR 2016 & HCR 2017.
GT6 Mk3 Roto - project in progress
Spitfire MKIV son's project now on the road as a daily driver
2.5 PI Saloon now EFI (PIe?), Engine rebuilt and running sweet.  Diff howling...... Survivor of HCR 2013 & 2014 Gone to live in Swansea

http://www.tengaston.plus.com
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piman
December 3, 2017, 9:07am Report to Moderator


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Hello Iggy,

the reference number is or should be on a stamped metal tag attached to the float chamber.

Alec


Oswestry, Shropshire.

Mk1 1\2 P.I.,Jaguar Mk 2, very long term restoration. Jaguar X Type estate 2.5, Hymer 564 motorhome.
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iggy
December 3, 2017, 9:53am Report to Moderator
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thanks for the replies guys, the small tag is not there on my carbs, but i now no what the ventri size is, il email Allens performance and let them no,


1972 Mk2 2.5 PI on carbs
2005 Fiat Stilo jtd                                              
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