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 Post subject: Twin 1 1/2 SU manifold
PostPosted: Sun Oct 04, 2020 1:50 pm 
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848cc
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Hi members

I am currently restoring my 1970 Mk2 Cooper S. I am putting a kent 266 cam in and med 1.3 rockers. I have a pair of 1 1/4 SUs and manifold and set of 1 1/2s with manifold. The manifold intake ports may have been opened up to suit the 1 1/2s as the AEG347 casting number from what I can glen after much google time seem to have been fitted to 1 1/4 coopers. Is this the correct manifold or at least will it be ok to use. I see reproduction manifolds for sale specifically for twin 1 1/2s. Do I need to buy one of these instead of the 347?

Thanks Richard


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PostPosted: Sun Oct 04, 2020 1:59 pm 
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1360cc
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There's a list of factory inlet manifolds here - viewtopic.php?f=25&t=89247

To fit 1 1/2" (HS4) SU's to the Australian Police specification engine the standard Cooper S 1 1/4" manifold (AEG573) was used, after a rework. The latter involved relocating the carby mounting studs to suit the HS4 diagonal arrangement and opening up the port on the carby side to 1 1/2".

Attachment:
AYG0245 Rework Inlet Manifold subset.jpg


Unlike the AEG573 the AEG347 doesn't appear to have a large enough platform to accommodate the HS4 angled mounting studs, so you may need a different manifold.


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PostPosted: Sun Oct 04, 2020 2:04 pm 
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Screamin1275 wrote:
Hi members

I am currently restoring my 1970 Mk2 Cooper S. I am putting a kent 266 cam in and med 1.3 rockers. I have a pair of 1 1/4 SUs and manifold and set of 1 1/2s with manifold. The manifold intake ports may have been opened up to suit the 1 1/2s as the AEG347 casting number from what I can glen after much google time seem to have been fitted to 1 1/4 coopers. Is this the correct manifold or at least will it be ok to use. I see reproduction manifolds for sale specifically for twin 1 1/2s. Do I need to buy one of these instead of the 347?

Thanks Richard


The AEG347 has vertical studs. H4 Su's will fit but if your carbs are HS4's then you will need a manifold like the AEG573 which can have studs fitted at a 45 deg angle.

Whatever manifold you choose can be opened up a little if needed to match the carby.


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PostPosted: Sun Oct 04, 2020 11:45 pm 
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Forty old years ago I fitted some MGB 1 1/2" SU's to a Cooper S manifold using some lynx (?) adapters which bolted up to the vertical studs and gave you the options for 2x diagonal or 4x diagonal bolted SU's ie 1 1/2" or 1 3/4". I don't know if they are still available - someone may. Just an option for you. See pic below, I will be rebuilding these as part of the restoration.


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PostPosted: Mon Oct 05, 2020 6:21 am 
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These adapters are available which do the opposite, you might be able to change them to work for you?

https://minisport.com.au/mini-moke-su-a ... 2-to-1-1a4

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PostPosted: Fri Oct 16, 2020 1:51 pm 
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I have 2 of the correct adaptors which look like they would work quite well & neatly. You can have them for price of postage if you would like to try them


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PostPosted: Sun May 19, 2024 12:31 pm 
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winabbey wrote:
There's a list of factory inlet manifolds here - https://ausmini.com/forums/viewtopic.php?f=25&t=89247

To fit 1 1/2" (HS4) SU's to the Australian Police specification engine the standard Cooper S 1 1/4" manifold (AEG573) was used, after a rework. The latter involved relocating the carby mounting studs to suit the HS4 diagonal arrangement and opening up the port on the carby side to 1 1/2".

Attachment:
AYG0245 Rework Inlet Manifold subset.jpg


Unlike the AEG573 the AEG347 doesn't appear to have a large enough platform to accommodate the HS4 angled mounting studs, so you may need a different manifold.


Hi winabbey. Do you have a pic of the heat shield mod AYG0246?

TIA Dan

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PostPosted: Sun May 19, 2024 12:57 pm 
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DOZ wrote:
Hi winabbey. Do you have a pic of the heat shield mod AYG0246?
TIA Dan

The modification to the one-piece heat shield as fitted to the MG Midget and AH Sprite (part 12G1460) to suit the twin HS4 carbies for SPO41 involves opening up the ports to 1 1/2", drilling holes for the HS4's diagonal mounting studs, shortening the height, removing an angled section from the top right and lower left, bending the upper section inwards and drilling three holes for the return springs.

Attachment:
AYG0246 Rework Heatshield wm.jpg


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PostPosted: Sun May 19, 2024 7:20 pm 
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winabbey wrote:
DOZ wrote:
Hi winabbey. Do you have a pic of the heat shield mod AYG0246?
TIA Dan

The modification to the one-piece heat shield as fitted to the MG Midget and AH Sprite (part 12G1460) to suit the twin HS4 carbies for SPO41 involves opening up the ports to 1 1/2", drilling holes for the HS4's diagonal mounting studs, shortening the height, removing an angled section from the top right and lower left, bending the upper section inwards and drilling three holes for the return springs.

Attachment:
AYG0246 Rework Heatshield wm.jpg


Thank you. I have one of these and its cracked, I thought it was home made lol. I replaced it with a heat shield kit from Mini Kingdom years ago - pretty sure I didn't throw it out but no idea where it is!

Cheers

Dan

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PostPosted: Sun May 19, 2024 8:10 pm 
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A single HIF44 works better than twins

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PostPosted: Mon May 20, 2024 10:46 am 
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DOZ wrote:
I have one of these and its cracked, I thought it was home made lol.

Mine was cracked too, and several others I've seen were the same. A bit of judicious welding and sanding, plus a lick of paint and its all good again.

Of course it may not fit if aftermarket extractors are used. It was designed to be used with the original pressed metal extractors.

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