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simonw
 Post subject: Is this a 1.75 Su ?
PostPosted: Thu Aug 20, 2015 7:54 am 
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Simonw
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sitnlo62
 Post subject: Re: Is this a 1.75 Su ?
PostPosted: Thu Aug 20, 2015 8:30 am 
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Simon,
That is an 1 1/2" SU
HS4

1 3/4" has a square mounting flange with 4 holes.

Dave

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1071 S
 Post subject: Re: Is this a 1.75 Su ?
PostPosted: Thu Aug 20, 2015 8:55 am 
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The "1 3/4 inch" refers to the diameter of the carb inlet.... Find a tape measure??

Cheers, Ian
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timmy201
 Post subject: Re: Is this a 1.75 Su ?
PostPosted: Thu Aug 20, 2015 8:58 am 
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This is mine, you can see the four square bolt holes to the manifold

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drmini in aust
 Post subject: Re: Is this a 1.75 Su ?
PostPosted: Thu Aug 20, 2015 9:09 am 
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1071 S wrote:
The "1 3/4 inch" refers to the diameter of the carb inlet.... Find a tape measure??

Cheers, Ian

Actually Ian, no, it refers to the carb outlet size.
AN HS6 has a smaller inlet bore than an HIF44 does, but can be machined out for better flow than stock.

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timmy201
 Post subject: Re: Is this a 1.75 Su ?
PostPosted: Thu Aug 20, 2015 9:13 am 
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drmini in aust wrote:
1071 S wrote:
The "1 3/4 inch" refers to the diameter of the carb inlet.... Find a tape measure??

Cheers, Ian

Actually Ian, no, it refers to the carb outlet size.
AN HS6 has a smaller inlet bore than an HIF44 does, but can be machined out for better flow than stock.

Inlet approx 41mm, outlet approx 44mm

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simonw
 Post subject: Re: Is this a 1.75 Su ?
PostPosted: Thu Aug 20, 2015 11:04 am 
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sitnlo62 wrote:
Simon,
That is an 1 1/2" SU
HS4

1 3/4" has a square mounting flange with 4 holes.

Dave


Thanks mate , only had the picture so couldn't measure in person..

anybody have a 1 3/4 they would like to sell ..? Pm me :)

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Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K
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1071 S
 Post subject: Re: Is this a 1.75 Su ?
PostPosted: Thu Aug 20, 2015 7:07 pm 
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drmini in aust wrote:
1071 S wrote:
The "1 3/4 inch" refers to the diameter of the carb inlet.... Find a tape measure??

Cheers, Ian

Actually Ian, no, it refers to the carb outlet size.
AN HS6 has a smaller inlet bore than an HIF44 does, but can be machined out for better flow than stock.


Close enough for Government work..... :) Its the principle that counts (ie measure..)

Interesting.. I always thought carbs necked down... Does that mean 6s don't?? The math tells me that 1 3/4" = 44.5 mm
... and the 44 under the bench measures 47(I) and 44 (O)..??? Which I would have known if I'd checked first .. :roll:

Cheers, Ian
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