H4 HS4 carbs

arcturus · Jun 13th, 2018, 17:38

Hi, Is the H4 the same size as the HS4 but with different internals. What's the difference Are they interchangeable as far as fitting goes, choke size etc? Just want to fit a heat shield but Burlens only have them for HS4. I know that I would need to modify them to fit on PV. B16b
air side 1.5/16" engine side 1.5/8th"

Derek UK · Jun 13th, 2018, 20:19

The main difference between the H4 and the HS4 is the way the fuel is routed to the jet. H4 has it going from the float bowl mounting bajo through internal drillings whereas the HS4 has it coming through a nylon tube from the bottom of the float bowl. If the Burlen shield is similar the Volvo HS6 ones (see your 144) it doesn't go far enough to the rear for the B16, I'd say better to make up your own from aluminium or stainless. Ali easier to shape at the back for protection from the heat from the hot end of the exhaust manifold. About £40 from Burlen to you so you will also save a few bob.

arcturus · Jun 13th, 2018, 21:11

I would do but don't have the tools etc for sheet metal working. I thought that I could alter the Burlen ones to fit. Really only need it for rear carb which sits over rear and hottest part of manifold.

blueosprey90 · Jun 13th, 2018, 22:21

You need a float bowl koosie.

http://joecurto.com/float-bowl-koozies

arcturus · Jun 14th, 2018, 09:12

BTW, is the carb size measured as the air side or engine side. ie.engine side H4. 1.1/2" Air size. 1.5/16"

Jun 13th, 2018, 17:38	#1
arcturus arcturus Last Online: Apr 10th, 2024 08:21 Join Date: Mar 2006 Location: Sagres Portugal	H4 HS4 carbs Hi, Is the H4 the same size as the HS4 but with different internals. What's the difference Are they interchangeable as far as fitting goes, choke size etc? Just want to fit a heat shield but Burlens only have them for HS4. I know that I would need to modify them to fit on PV. B16b air side 1.5/16" engine side 1.5/8th" __________________ life's too short to drink bad wine Last edited by arcturus; Jun 13th, 2018 at 20:20.

Jun 13th, 2018, 20:19	#2
Derek UK VOC Member Last Online: Yesterday 13:53 Join Date: Jul 2006 Location: Chatham	The main difference between the H4 and the HS4 is the way the fuel is routed to the jet. H4 has it going from the float bowl mounting bajo through internal drillings whereas the HS4 has it coming through a nylon tube from the bottom of the float bowl. If the Burlen shield is similar the Volvo HS6 ones (see your 144) it doesn't go far enough to the rear for the B16, I'd say better to make up your own from aluminium or stainless. Ali easier to shape at the back for protection from the heat from the hot end of the exhaust manifold. About £40 from Burlen to you so you will also save a few bob. Last edited by Derek UK; Jun 13th, 2018 at 20:23.

Jun 13th, 2018, 21:11	#3
arcturus arcturus Last Online: Apr 10th, 2024 08:21 Join Date: Mar 2006 Location: Sagres Portugal	I would do but don't have the tools etc for sheet metal working. I thought that I could alter the Burlen ones to fit. Really only need it for rear carb which sits over rear and hottest part of manifold. __________________ life's too short to drink bad wine

Jun 14th, 2018, 09:12	#5
arcturus arcturus Last Online: Apr 10th, 2024 08:21 Join Date: Mar 2006 Location: Sagres Portugal	BTW, is the carb size measured as the air side or engine side. ie.engine side H4. 1.1/2" Air size. 1.5/16" __________________ life's too short to drink bad wine

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Jun 13th, 2018, 22:21	#4
blueosprey90 Master Member Last Online: Yesterday 11:26 Join Date: May 2017 Location: New Milford, Connecticut	You need a float bowl koosie. http://joecurto.com/float-bowl-koozies

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