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Twin HS4 1.5" Carb Full Refurbishment
https://www.ausmini.com/forums/viewtopic.php?f=2&t=83695		 Page 1 of 3
Author:  Mick [ Fri Nov 29, 2013 8:18 pm ]
Post subject:  Twin HS4 1.5" Carb Full Refurbishment
I've been keen on trying out a pair of Twin 1.5" SUs as I have never had a working pair.

I picked up some opposite bowl carbs some time back from a Spitfire, they are unfortunately waxstat jets which are undesirable I am told, so I have set about to convert them to fixed needle, standard jet carbs. This means new needles, fixed needle adaptors, waxstat jet conversions (not just the jets) and slides.

I've picked up a standard Mk2 Cooper S manifold, and all the parts have arrived for a full refurbishment on both carbs.

But tonight I've just filled the blaster up with a 25Kg bag of medium grade glass bead. This makes old carbs (and any alloy bits for that matter) look amazing once again.

The blaster is my favorite tool in the shed. Its so good its therapeutic. All my troubles just float away...

I'll do some More over the weekend.

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Author:  Morris 1100 [ Fri Nov 29, 2013 8:40 pm ]
Post subject:  Re: Twin HS2 1.5" Carb Full Refurbishment
If you want some extra therapy I have about 50 assorted SU's you can blast for me. :lol:
Author:  Mick [ Fri Nov 29, 2013 8:47 pm ]
Post subject:  Re: Twin HS2 1.5" Carb Full Refurbishment
Ha ha, using my own analogy, that would have me feeling pretty relaxed...
Author:  Wombat [ Sat Nov 30, 2013 6:15 am ]
Post subject:  Re: Twin HS2 1.5" Carb Full Refurbishment
You missed a bit ;)
Author:  AJ [ Sat Nov 30, 2013 9:52 am ]
Post subject:  Re: Twin HS2 1.5" Carb Full Refurbishment
Acrylic Thinners does a very good clean up job on SU's , and doesn't remove the original finish .......
Author:  Morris 1100 [ Sat Nov 30, 2013 9:54 am ]
Post subject:  Re: Twin HS2 1.5" Carb Full Refurbishment
Is it the act of blasting that creates the mellow atmosphere?
Or is it the thumping beat of the air compressor?
Author:  Mick [ Sat Nov 30, 2013 11:42 am ]
Post subject:  Re: Twin HS2 1.5" Carb Full Refurbishment
AJ wrote:
Acrylic Thinners does a very good clean up job on SU's , and doesn't remove the original finish .......


They had a polish which was provided through another media. I'm not sure what it was but I have come closest with walnut. Glass is pretty good however, I think just about perfect. There's no removal of aluminium, and it polishes as it cleans, and is better in that it is reusable more than once. I might try plastic one time as well...

Morris 1100 wrote:
Is it the act of blasting that creates the mellow atmosphere?
Or is it the thumping beat of the air compressor?


Its the effortless removal of 50 years of grime and abuse which makes it so good. If nothing else is easy in your day, then blasting always is...

Some abuse can't be wiped away with the pass of a bead blaster. Look what happened to the fuel bowl some time in the past, and the repair....There's two holes affected, I've done a little bit of a repair on the one closest already.

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Anyone got a fuel bowl they want to part with? Oh, and a pair of horns to suit the 1.5?
Author:  winabbey [ Sat Nov 30, 2013 12:20 pm ]
Post subject:  Re: Twin HS2 1.5" Carb Full Refurbishment
Mick wrote:
Anyone got a fuel bowl they want to part with? Oh, and a pair of horns to suit the 1.5?

If no-one else can help John Smidt had a pile of old SU's the last time I was there. Get the part number off yours to ensure you get the correct one.

P.S. His contact number is in the Mini Businesses thread. You know where that is, right?
Author:  Morris 1100 [ Sat Nov 30, 2013 3:30 pm ]
Post subject:  Re: Twin HS2 1.5" Carb Full Refurbishment
I probably have the fuel bowl, what is the number?
Author:  goodie [ Sat Nov 30, 2013 7:40 pm ]
Post subject:  Re: Twin HS2 1.5" Carb Full Refurbishment
What filters are you going to use Mick ?

This is a set of 1- 1/2 "s that i brought from Harris Eng in the UK about 12mths ago , haven't fitted them yet , but i am interested to see what difference they make to my engine .

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Author:  Mick [ Sat Nov 30, 2013 7:59 pm ]
Post subject:  Re: Twin HS2 1.5" Carb Full Refurbishment
I'd like to have a crack at modifying a (already very butchered) twin SU airbox.

I wouldn't ruin a good one, they're too hard to find. I've seen one fitted a long time ago by adapting the case to accept the horns, and taking a scallop out of the front of the case to blend around the piston covers on the SUs.

Thanks Mick, That fuel bowl number seems generic, AUD2140. I don't think that apart from the tops the fuel bowls are any different to stock. The left is the same as the right.
Author:  Morris 1100 [ Sat Nov 30, 2013 8:42 pm ]
Post subject:  Re: Twin HS2 1.5" Carb Full Refurbishment
All the float bowls on my HS2 and HS4 carbys are AUC1310 (I just looked at about 20 float bowls!)
The HS6 TR7 carbys have the AUD2140 bowls but I don't want to pull them apart!

The main difference is a couple of extra lumps on the mount.

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Author:  Mick [ Sat Nov 30, 2013 8:44 pm ]
Post subject:  Re: Twin HS2 1.5" Carb Full Refurbishment
Thanks Mick, is there any difference in volume perhaps??


I've finished rebushing the carbs. The 1.5s came bushed, so it was no drama to remove and replace them. There wasn't much wear in the old bushes because the carbs use coiled springs instead of the external springs we use on 1.25s. This removes that large and constant radial load on the shafts and reduces wear. I only really replaced them cos I paid for them....


The rest of the carb is more or less complete, I changed out the waxstat linkages for standard types (available complete for about 10 dollars) and also changed out the jet bearing assembly as well.

The sleeves I acquired for the conversion to solid needle wasn't what I was hoping for. SU Midel took me too literally and what I got was a cap to convert a solid needle into a swinging needle.... I need to convert a swinging needle carb into a solid one...

I might go with the swinging needle for the moment to keep it simple.

The linkages are ready to go in, I just need to shorten them down a little. I also need to consider my spacers. I have two types here to choose from. The ones pictured are alloy 14mm, and I also have plastic 10mm ones. Any hints or tips on choosing one spacer over another??

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Author:  Morris 1100 [ Sat Nov 30, 2013 8:53 pm ]
Post subject:  Re: Twin HS2 1.5" Carb Full Refurbishment
I think the difference in the float bowls is probably age. The volume and height looks just the same.
Author:  Mick [ Sat Nov 30, 2013 9:05 pm ]
Post subject:  Re: Twin HS2 1.5" Carb Full Refurbishment
Can I come up and drop in next Saturday? I'm up at the airfield Saturday afternoon.
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