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Best 1275 Carburetter Set Up


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#1 Ian Godden

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Posted 07 July 2019 - 12:04 PM

Thank you for letting me join the forum, I am running a Mini Metro 1275 engine, serial number 12HE25117315, it currently has a Webber low emission carb from a VW but isn’t running right, very lumpy, I had it on a rolling road yesterday and no joy, despite drilling the jets out etc, I have been advised to look at some different options, Single HS6SU and manifold, twin HS4 SU with manifold or a Webber 32/36 DGAS which should fit onto my existing manifold, I cant drive it really as it is as it is running lean, any advice gratefully received, and if anyone has anything for sale, I am keen to get it running right.

 

Thanks

 

Ian



#2 Arthy

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Posted 07 July 2019 - 04:37 PM

I would think a single HIF38 would be best suited! No need for twin HS4's on a standard engine, which I would presume you have? Just my opinion though! 

 

Kind Regards,

Arthur 



#3 Magneto

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Posted 07 July 2019 - 05:14 PM

Arthy is right, people tend to over-carburate these stock engines - gives absolutely no more performance. Single HIF38 is the best option if the engine is stock inside.

 

If the 32/36 will fit it is a good choice too, you just need to find someone with a box full of jets so you can get it set up right.

 

With the HIF, the most you'll have to change is a single needle.


Edited by Magneto, 07 July 2019 - 05:15 PM.


#4 cal844

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Posted 07 July 2019 - 07:41 PM

Single HIF38 or a single HS4

Is the way to go here, don't use twin carbs, they just over complicate things.

IE balancing the carbs and then adjusting throttle stops etc

Edited by cal844, 07 July 2019 - 07:42 PM.


#5 nicklouse

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Posted 07 July 2019 - 08:14 PM

Hif38 or 44 depending on what you can get.

#6 johnv

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Posted 08 July 2019 - 05:19 AM

Twin 1 1/4s. For the look.

#7 ACDodd

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Posted 08 July 2019 - 05:34 AM

Originally fitted in a metro it would have an HIF44 SU.

Only fit a carb that you can tune. No point fitting a unit, that no one keeps the jets or is unable to dial it in properly.

Ac

#8 gazza82

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Posted 08 July 2019 - 09:38 AM

Twin 1 1/4s. For the look.

 

And pain in keeping them balanced .. forget looks, be practical.



#9 johnv

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Posted 08 July 2019 - 09:42 AM

 

Twin 1 1/4s. For the look.

 

And pain in keeping them balanced .. forget looks, be practical.

 

 

then buy a toyota  :shifty:  .. seriously though, once they're set up they're fine .. they don't go out of balance



#10 timmy850

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Posted 08 July 2019 - 10:00 AM

As you can see there are many choices and definitions of the "best" carb. You can go for power, economy, price, ease of tuning, ease of fitting, sound..

 

I've driven cars with:

Single HS2

Single HS4

Single HIF44

Twin HS2

Twin HS4

Dellorto DHLA 40 (side draft)

Weber IDF 44 (down draft)

 

 

I personally like the side draft Dellorto, which is why I have one on my car. It makes a great noise, easy to tune and looks great too. 



#11 nicklouse

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Posted 08 July 2019 - 12:14 PM

And having driven one car with the same engine but with many carbs fitted I would still use an HIF38/44. Which just depends on the engine spec.

#12 Arthy

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Posted 08 July 2019 - 01:27 PM



Twin 1 1/4s. For the look.

And pain in keeping them balanced .. forget looks, be practical.
then buy a toyota :shifty: .. seriously though, once they're set up they're fine .. they don't go out of balance
to be honest I’ve been running twin HS4’s for 3 years (1330), and they’ve never let me down. 15,000+ miles on them too. I find once they’re set up properly and have been reconditioned they’re fine!

Edited by Arthy, 08 July 2019 - 01:28 PM.


#13 johnR

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Posted 08 July 2019 - 02:27 PM

You don't specify what exactly you mean by 'Best' but if it's for looks as well as perfectly good performance l'd say twin carbs every time!

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Edited by johnR, 08 July 2019 - 02:29 PM.





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