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Twin Hs4 Carb Identification


Best Answer mvahora , 12 February 2021 - 09:53 AM

heard back from Berlen. This is their reply:

The needle ABK traces these to a triumph dolomite from 75 onwards, as fitted with the red spring.

However you appear to have a mixed pair of dolomite carbs, one from 75, one from 76, hence the small differences between the two. The 75 would have been spec number FZX 1005, THE 76 FZX 1051. 
It looks like these have been paired together.

 

If the jets and needles are the same for both, I see no reason why this setup won’t run as intended.

 

So detail changes like needles jets and springs are carb specific, but carb bodies and service items like gaskets washers and o rings are generic.
 
As far as the dampers are concerned, you would be best served to run a matched pair, so 2x AUC 8114.
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#1 mvahora

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Posted 16 January 2021 - 05:50 AM

I have a twin hs4 carb setup that has been refurbished (as per pic attached).  I'm trying to decipher which car they originally came off (my guess is an MG). There is no tag on them but I can see codes on the parts. I've listed them below. 

 

Is it normal to have different codes on either side of a twin HS4 carb setup? 

 

Codes:

 

Dashpot - Left PDC18, Right PDC14

 

Damper - Left AUC8103  Right AUC8114

 

Piston  - Left AUC1331B, Right AUC1331

 

Body - Left AUC1344, Right AUC1300 MOD3

 

Float Bowl  - BOTH AUC1310

 

Float Bowl Lid - Left AUD9203, Right AUD2277

Attached Files


Edited by mvahora, 16 January 2021 - 05:50 AM.


#2 steeley

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Posted 16 January 2021 - 10:07 AM

Try mailing burlen


http://burlen.co.uk/

#3 Chris1275gt

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Posted 16 January 2021 - 11:57 AM

I'd of thought that it would be normal to have different numbers for some parts as they are the same but left and right handed.

#4 richmondclassicsnorthwales

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Posted 16 January 2021 - 04:35 PM

Without the specific tag, they could be off anything,



#5 mvahora

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Posted 16 January 2021 - 10:30 PM

Try mailing burlen


http://burlen.co.uk/

 

Good idea, will do. hopefully they can shed some light. 

 

 

I'd of thought that it would be normal to have different numbers for some parts as they are the same but left and right handed.

 

hmmm that's what I did have in mind but don't want to go bolting them onto my motor if the dampers for example need to be the same etc. 


Edited by mvahora, 16 January 2021 - 10:31 PM.


#6 GraemeC

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Posted 17 January 2021 - 11:10 AM

I’d be dubious if they ever started life as a pair


Edited by GraemeC, 18 January 2021 - 08:19 AM.


#7 mvahora

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Posted 17 January 2021 - 11:24 PM

I’d e dubious if they ever started life as a pair

 

Hmmm Would that have any effect on performance if they are different and have varying part numbers?

 

Ive emailed burnlen / SU. havent received a reply yet


Edited by mvahora, 17 January 2021 - 11:25 PM.


#8 Tds76

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Posted 18 January 2021 - 01:06 AM

If you have the time you can trawl through the tables and data sheets and see what they were originally fitted to. 

http://www.oldengine.../SUCarbMenu.htm

 

As a reference and as you would expect, the data sheet for the 998 Cooper shows the majority of the parts are common between L & R carbs.

http://www.oldengine...tors/AUD104.htm

 

 

Cheers, Paul. 



#9 GraemeC

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Posted 18 January 2021 - 08:21 AM

 

I’d e dubious if they ever started life as a pair

 

Hmmm Would that have any effect on performance if they are different and have varying part numbers?

 

 

 

Hard to tell without knowing the in's and out's of all the differences between part numbers and then how they interact with each other.

However I would certainly have expected the same piston, damper, dash pot and needle in each side.

 

I notice whoever refurbed them didn't even take the 2 seconds to make sure the spacers were orientated correctly, which would make me question the rest.......


Edited by GraemeC, 18 January 2021 - 08:23 AM.


#10 mvahora

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Posted 23 January 2021 - 12:05 AM

If you have the time you can trawl through the tables and data sheets and see what they were originally fitted to. 

http://www.oldengine.../SUCarbMenu.htm

 

As a reference and as you would expect, the data sheet for the 998 Cooper shows the majority of the parts are common between L & R carbs.

http://www.oldengine...tors/AUD104.htm

 

 

Cheers, Paul. 

 

 

where do you guys find these legend websites lol. 

 

Ill have a hunt through when i get some time and seee if i can find a match 

 

Thanks so much



#11 mvahora

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Posted 23 January 2021 - 12:07 AM

 

 

I’d e dubious if they ever started life as a pair

 

Hmmm Would that have any effect on performance if they are different and have varying part numbers?

 

 

 

Hard to tell without knowing the in's and out's of all the differences between part numbers and then how they interact with each other.

However I would certainly have expected the same piston, damper, dash pot and needle in each side.

 

I notice whoever refurbed them didn't even take the 2 seconds to make sure the spacers were orientated correctly, which would make me question the rest.......

 

 

 

Hmmm yes i will have to do some more digging. Ive emailed burlen but havent got a reply yet. 

 

oh bugger thanks for pointing that out. ill change it over if i end up using them...



#12 62S

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Posted 30 January 2021 - 03:57 PM

 

I notice whoever refurbed them didn't even take the 2 seconds to make sure the spacers were orientated correctly, which would make me question the rest.......

Or make sure the dampers are a pair...



#13 mvahora

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Posted 12 February 2021 - 09:53 AM   Best Answer

heard back from Berlen. This is their reply:

The needle ABK traces these to a triumph dolomite from 75 onwards, as fitted with the red spring.

However you appear to have a mixed pair of dolomite carbs, one from 75, one from 76, hence the small differences between the two. The 75 would have been spec number FZX 1005, THE 76 FZX 1051. 
It looks like these have been paired together.

 

If the jets and needles are the same for both, I see no reason why this setup won’t run as intended.

 

So detail changes like needles jets and springs are carb specific, but carb bodies and service items like gaskets washers and o rings are generic.
 
As far as the dampers are concerned, you would be best served to run a matched pair, so 2x AUC 8114.





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