SU carbs20b S

arcturus · Nov 3rd, 2010, 14:06

Hi, what's the purpose of the small pipe highlighted by the card, is it just a breather? I'm converting from air filter box to separate "sport pancake" filters.
Also the crankcase breather. Can I just blank it off. I don't think that it will doom the planet

as well the breather pipe from the oil filler cap to inlet manifold, do I really need that? I would like to eventually try to find a chrome rocker box cover and filler cap and get rid of the messy pipework.

222s · Nov 3rd, 2010, 15:41

Any particular reason for converting the filters? AFAIK, the airbox type is just as free flowing, but is also much quieter than the pancake type.

arcturus · Nov 3rd, 2010, 16:37

Will look much better when the motor has been out and painted. At the moment the engine bay looks a bit messy! Will compensate for xtra noise by more sound deadening, particularly the inside of bonnet.

marcmarel · Nov 3rd, 2010, 18:48

Messy is the way it was made, removing hoses from the engine and putting chromed bits on it doesn't sound very 'concours' to me.

You could try the blue filters that were on the B18B, you can connect these to the breathing system like it is supposed to. Still not 'period' though.

http://cvi-automotive.se/en/articles...gaskets-decals

classicswede · Nov 3rd, 2010, 20:08

The air box is actualy worth about 3BHP over the best flowing pancake filters.

From what I can see in the photo that will be the fuel over flow pipe.

Do not blank the breather pipe off, you will need to either connect to the new filters or re plumb so it breaths to under the car.

arcturus · Nov 3rd, 2010, 20:14

I take your point.

Lucien · Nov 3rd, 2010, 23:46

i agree with classicswede. For most people the airbox is an upgrade over pancakes for the b20. Hang onto it if I were you...

Snowman · Nov 4th, 2010, 09:58

When I changed from a b20a to the new engine with twin carbs, I went the pancake route but am now about to change to the air box set up, will be interesting to see if there are any changes.

arcturus · Nov 4th, 2010, 10:10

How will you quantify that?. BTW I noticed when looking through my "Volvo cars engines" book a few illustrations showing the "pancake" set up. Also the "custom performance" section shows an illustration with Volvo blue filters.

Snowman · Nov 4th, 2010, 10:54

No idea really! Logic says that a ram air feed to the carbs ought to help breathing. As usual, if I've spent some money, I'll convince myself it is better!

From a cosmetic perspective, the blue filters I've had to date look fine but I'm more interested in how it goes rather than how it looks.

Nov 3rd, 2010, 15:41	#2
222s Amazoniste Last Online: Sep 19th, 2016 21:52 Join Date: Nov 2002 Location: Emsworth View Photos By: 222s	Any particular reason for converting the filters? AFAIK, the airbox type is just as free flowing, but is also much quieter than the pancake type. __________________ Paul - 1967 Amazon 222S B20 o/d Estate & 1961 A-H Sprite Mk2 948cc WANTED - For '67 Amazon estate - offside rear quarter, preferably new old stock.

Nov 3rd, 2010, 16:37	#3
arcturus arcturus Last Online: Yesterday 08:14 Join Date: Mar 2006 Location: Sagres Portugal	Will look much better when the motor has been out and painted. At the moment the engine bay looks a bit messy! Will compensate for xtra noise by more sound deadening, particularly the inside of bonnet. __________________ life's too short to drink bad wine

Nov 3rd, 2010, 20:08	#5
classicswede Trader Volvo in my veins Last Online: Apr 26th, 2024 23:53 Join Date: Dec 2004 Location: Anglesey	The air box is actualy worth about 3BHP over the best flowing pancake filters. From what I can see in the photo that will be the fuel over flow pipe. Do not blank the breather pipe off, you will need to either connect to the new filters or re plumb so it breaths to under the car. __________________ http://www.classicswede.org www.classicswede.co.uk

Nov 3rd, 2010, 20:14	#6
arcturus arcturus Last Online: Yesterday 08:14 Join Date: Mar 2006 Location: Sagres Portugal	I take your point. __________________ life's too short to drink bad wine

Nov 4th, 2010, 10:10	#9
arcturus arcturus Last Online: Yesterday 08:14 Join Date: Mar 2006 Location: Sagres Portugal	How will you quantify that?. BTW I noticed when looking through my "Volvo cars engines" book a few illustrations showing the "pancake" set up. Also the "custom performance" section shows an illustration with Volvo blue filters. __________________ life's too short to drink bad wine

Nov 3rd, 2010, 18:48	#4
marcmarel Member Last Online: Mar 3rd, 2011 10:40 Join Date: Jan 2007 Location: Maasland	Messy is the way it was made, removing hoses from the engine and putting chromed bits on it doesn't sound very 'concours' to me. You could try the blue filters that were on the B18B, you can connect these to the breathing system like it is supposed to. Still not 'period' though. http://cvi-automotive.se/en/articles...gaskets-decals

Nov 3rd, 2010, 23:46	#7
Lucien VOC Member Last Online: Yesterday 13:31 Join Date: Sep 2008 Location: Walton-on-Thames	i agree with classicswede. For most people the airbox is an upgrade over pancakes for the b20. Hang onto it if I were you...

Nov 4th, 2010, 09:58	#8
Snowman never knowingly slow Last Online: Aug 8th, 2012 09:31 Join Date: Nov 2006 Location: near Bath	When I changed from a b20a to the new engine with twin carbs, I went the pancake route but am now about to change to the air box set up, will be interesting to see if there are any changes.

Nov 4th, 2010, 10:54	#10
Snowman never knowingly slow Last Online: Aug 8th, 2012 09:31 Join Date: Nov 2006 Location: near Bath	No idea really! Logic says that a ram air feed to the carbs ought to help breathing. As usual, if I've spent some money, I'll convince myself it is better! From a cosmetic perspective, the blue filters I've had to date look fine but I'm more interested in how it goes rather than how it looks.

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