Carbs

fett · Feb 20, 2011

Does anyone know if the SU carbs AUD 521 AND AUD 527 are interchangeable? It looks like the 527s have something extra on the side of them.

I will be replacing them both in pairs but dont want to end up with running problems. Its for my 1972 RRC with 3.5 v8.

Is the extra lump on the side of the 527s auto choke or summit?

All info asap would be appreciated

landowner · Feb 20, 2011

The thing on the side of the 527 will be a stepper motor.

The 521 is an HS6 with a BBG needle
I'm checking the 527 but not sure what it came off, you may be able just to swap needles as the jets are mainly the same

GRATCH · Feb 20, 2011

Oi

no multi posting, you should know better.

fett · Feb 20, 2011

soz , need an answer quick!

landowner · Feb 20, 2011

fett said:
soz , need an answer quick!

What vehicle are your newer carbs off. I can cross reference them for you although I cant find AUD527 in the SU manual so check that the numbers are corrrect.

fett · Feb 20, 2011

I dont know and I couldnt find the number either lol :doh:

landowner · Feb 20, 2011

fett said:
I dont know and I couldnt find the number either lol :doh:

If they have a motor on the side then they will be the later HIF44 electronic choke carbs I think so maybe you will have to convert them to manual choke.

If float bowls under carb on both sets then the needles will swap as the jets will be the same as long as choke size is the same.

All jets on similar sized carbs are the same they just used different needles for different applications.

fett · Feb 20, 2011

aparantly the bits on the side were fuel resovires, like the sd1 ones.

I managed to get them for £17 and £15 shipping so I think I wont lose too much

I just need to get them proffesionally refurbished somewhere now and then put them on and get the other set done to be in reserve.

landowner · Feb 20, 2011

fett said:
aparantly the bits on the side were fuel resovires, like the sd1 ones.

I managed to get them for £17 and £15 shipping so I think I wont lose too much

I just need to get them proffesionally refurbished somewhere now and then put them on and get the other set done to be in reserve.

You can buy all the bits from Burlen Fuel Systems Ltd

as long as the damper pistons are not worn then it's just jets and needles

They are prob HS6 carbs then. Still good carbs for the job

fett · Feb 21, 2011

cool, thats good , as its a bit smokey on the old ones and I dont want to bore wash it ,

Carbs

fett

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landowner

Pensioner Pete

GRATCH

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fett

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landowner

Pensioner Pete

fett

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landowner

Pensioner Pete

fett

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landowner

Pensioner Pete

fett

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