Pv 544 b18a weber carb conversion ?

KEVFITZ · Aug 9th, 2023, 10:36

Hi,

My B18A engine has a single Zenith carb which could need replacing..has anyone replaced with a Weber and if so which type is used?

Thanks

samaron · Aug 9th, 2023, 11:16

I made a thread about a similar subject a little while ago. You can read it here.

If you want a direct replacement, there are really no options. There is a Weber ICH model with the same footprint, but you will most likely need to rejet it to work properly. Some modifications are needed too, probably.

Since you have a B18, you have more options than what I have with my B16 engine. Other kits are available with appropriate inlet manifolds and linkages. For instance a kit like this.

Rebuilding the Zenith is an option too, but it is difficult to find someone that will touch it. SU carburetors is the preferred brand among rebuilders. My carburetor went through several people before someone competent enough managed to rebuild it. Had to ship mine to VP Autoparts in Sweden. My impression is that they outsource the job to a trusted rebuilder.

Rustinmotion · Aug 9th, 2023, 11:16

Quote:

Originally Posted by KEVFITZ

Hi,

My B18A engine has a single Zenith carb which could need replacing..has anyone replaced with a Weber and if so which type is used?

Thanks

Classic carbs do a kit

Derek UK · Aug 9th, 2023, 14:02

Read through the info on Sam's link. Although still not cheap due to the parts that need to be replaced, a good conversion is to the single Stromberg fitted to the last couple of years of the B18A (also B20A). Conversion needs the carb along with the single carb inlet/exhaust manifold. This manifold has the twin outlets so you will also need at least the front section of the exhaust system. You can of course go to a Simons/Jetex system. Air filter is best kept to the correct Volvo one for the Stromberg. Everything will look original and you will gain between 5-7bhp even with the A cam. This combination runs very sweetly and very suitable for everyday motoring. With an overdrive it is even better. As many people switch to twin carbs this set up is not too hard to find.

KEVFITZ · Aug 9th, 2023, 16:52

Thank you all..very interesting information for a new owner!!

Willsapples · Aug 14th, 2023, 10:42

Hi, I have a '66 121 B18A engine which had the Zenith carb. I replaced it with a Weber 34 kit from Skandix Germany. It's a direcct fit and accepts the standard aircleaner so looks correct under the bonnet. Not a bad price either. I've now done 10,000 miles with no problem. It's also E10 compliant.

Derek UK · Aug 14th, 2023, 11:03

I should have had a look at that yesterday at Cranleigh. Good to meet you. Derek with the dark blue Estate.

Aug 9th, 2023, 10:36	#1
KEVFITZ New Member Last Online: Yesterday 08:31 Join Date: Aug 2023 Location: YORK	Pv 544 b18a weber carb conversion ? Hi, My B18A engine has a single Zenith carb which could need replacing..has anyone replaced with a Weber and if so which type is used? Thanks

Aug 9th, 2023, 11:16	#2
samaron Member Last Online: Jan 15th, 2024 22:45 Join Date: Jan 2023 Location: Norway	I made a thread about a similar subject a little while ago. You can read it here. If you want a direct replacement, there are really no options. There is a Weber ICH model with the same footprint, but you will most likely need to rejet it to work properly. Some modifications are needed too, probably. Since you have a B18, you have more options than what I have with my B16 engine. Other kits are available with appropriate inlet manifolds and linkages. For instance a kit like this. Rebuilding the Zenith is an option too, but it is difficult to find someone that will touch it. SU carburetors is the preferred brand among rebuilders. My carburetor went through several people before someone competent enough managed to rebuild it. Had to ship mine to VP Autoparts in Sweden. My impression is that they outsource the job to a trusted rebuilder. __________________ 1958 Amazon 4-door saloon

Aug 9th, 2023, 14:02	#4
Derek UK VOC Member Last Online: Yesterday 15:34 Join Date: Jul 2006 Location: Chatham	Read through the info on Sam's link. Although still not cheap due to the parts that need to be replaced, a good conversion is to the single Stromberg fitted to the last couple of years of the B18A (also B20A). Conversion needs the carb along with the single carb inlet/exhaust manifold. This manifold has the twin outlets so you will also need at least the front section of the exhaust system. You can of course go to a Simons/Jetex system. Air filter is best kept to the correct Volvo one for the Stromberg. Everything will look original and you will gain between 5-7bhp even with the A cam. This combination runs very sweetly and very suitable for everyday motoring. With an overdrive it is even better. As many people switch to twin carbs this set up is not too hard to find.

Aug 9th, 2023, 16:52	#5
KEVFITZ New Member Last Online: Yesterday 08:31 Join Date: Aug 2023 Location: YORK	Thank you all..very interesting information for a new owner!!

Aug 14th, 2023, 10:42	#6
Willsapples New Member Last Online: Mar 24th, 2024 10:14 Join Date: Apr 2023 Location: Aldershot	Hi, I have a '66 121 B18A engine which had the Zenith carb. I replaced it with a Weber 34 kit from Skandix Germany. It's a direcct fit and accepts the standard aircleaner so looks correct under the bonnet. Not a bad price either. I've now done 10,000 miles with no problem. It's also E10 compliant.

Aug 14th, 2023, 11:03	#7
Derek UK VOC Member Last Online: Yesterday 15:34 Join Date: Jul 2006 Location: Chatham	I should have had a look at that yesterday at Cranleigh. Good to meet you. Derek with the dark blue Estate.

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