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Leighton
 Post subject: carby sizes
PostPosted: Tue Jun 17, 2008 2:20 pm 
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hi,

just want to know how you tell what size the su is? and whats the difference between a 1.1/4 and a 1.1/2

cheers leighton

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simon k
 Post subject: Re: carby sizes
PostPosted: Tue Jun 17, 2008 2:30 pm 
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Leighton wrote:
hi,

just want to know how you tell what size the su is? and whats the difference between a 1.1/4 and a 1.1/2

cheers leighton


the difference is the throat size, and therefore amount of air that can go through it....

easiest way to tell the size is by the mounting bolts

1.25" - bolts are lined up vertically IE:
o
o

1.5" - bolts are lined up at 45 degrees IE:
o
....o

1.75" - 4 bolts IE:
o o
o o

1.75"s commonly come in 2 varieties, the HS variety has the fuel bowl beside it, the HIF variety has the bowl underneath. 1.5"s also come with the underneath bowl, but they're not common

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Last edited by simon k on Tue Jun 17, 2008 2:37 pm, edited 1 time in total.

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sports850
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PostPosted: Tue Jun 17, 2008 2:30 pm 
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Measure the throat is the easiest way but also have a look at the stud holes where it mounts onto the manifold , if there are two studs vertically opposed it's an 1 1/4" , if there are two studs diagonally opposed it's an 1 1/2" , if there are 4 studs it's an 1 3/4" .

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Spaceboy
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PostPosted: Tue Jun 17, 2008 2:47 pm 
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the hs4 or inch and a half is physically bigger than the hs2 or inch and a quarter.

in addition the hs4 uses a doughnut shaped air filter that totally surrounds the carb, wheras the hs2 has a smaller round airfilter box next to the carb.

also you can tell by the nuts that attach it to the.... :lol:
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spraycanmansam
 Post subject: Re: carby sizes
PostPosted: Tue Jun 17, 2008 5:32 pm 
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Leighton wrote:
whats the difference between a 1.1/4 and a 1.1/2


1/4 of an inch :P
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gafmo
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PostPosted: Tue Jun 17, 2008 5:40 pm 
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If any one does not know what a HIF44 looks like
Image
Image

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frednutz&co
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PostPosted: Tue Jun 17, 2008 6:59 pm 
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poorn :twisted:
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BALLISTIC
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PostPosted: Tue Jun 17, 2008 8:39 pm 
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gafmo wrote:
Image


ohhhh ahhhh.....shiney!!!! 8)

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drmini in aust
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PostPosted: Tue Jun 17, 2008 9:19 pm 
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Pfft... those seem to give more trouble than an HS6 does! :lol:
[dons flameproof suit] 8)

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Morris 1100
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PostPosted: Tue Jun 17, 2008 9:26 pm 
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A bloke on the 1100 mailing list was having trouble with a flat spot in his fairly worked Austin 1300 at higher speeds, he tried a lot of things to cure it and in his desperation he removed the HIF44 (1¾") and stuck on the stock HS4 (1½"). It didn't cure the flat spot (which he found was a dodgy plug lead) but it did improve the pick-up and drivability so much that he is sticking with the HS4.
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Leighton
 Post subject: carby sizes
PostPosted: Tue Jun 17, 2008 10:38 pm 
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thanks for the reply's- tommorow i will have a look at what ive got..... cheers leighton

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