Help with Twin SUs fuel leak - Page 2

AidanC · Mar 25th, 2010, 22:18

The cam is dependent on the intake & outlet setup - the freer flowing they are, thr richer needles that you'll be able to run at mid and higher revs. All the cam can do is move the valves - the volumes that flow through are dependent on other factors.

I'd match my needles to the nearest standard spec engine. I use B18B needles and they seem to work well for my setup (d cam, B18B head, 4 branch manifold). I could possibly run a slightly richer needle but it doesn't seem lean at higher revs so I'm happy with there or thereabouts.

1966 122s · Mar 26th, 2010, 21:59

Thanks Aidan,

I have 1966 B18 (?? B18B), twin downpipes, Simonz sports exhaust. (The Exhaust really seemed to open up the top end.) Hence I guess I should go with the standard B18B jets as you have.
Thanks for this !

AidanC · Mar 27th, 2010, 11:22

Try giving it a bit of choke under hard accelleration at higher revs and see if it goes faster - its a bit crude but it'll show up leanness if its in any way significant. Other that that, just read the plugs and see how things go.

Mar 25th, 2010, 22:18	#11
AidanC Senior Member Last Online: Feb 6th, 2024 11:22 Join Date: Jun 2007 Location: Kildare	The cam is dependent on the intake & outlet setup - the freer flowing they are, thr richer needles that you'll be able to run at mid and higher revs. All the cam can do is move the valves - the volumes that flow through are dependent on other factors. I'd match my needles to the nearest standard spec engine. I use B18B needles and they seem to work well for my setup (d cam, B18B head, 4 branch manifold). I could possibly run a slightly richer needle but it doesn't seem lean at higher revs so I'm happy with there or thereabouts. __________________ My Volvos: '67 Amazon 131 '12 XC90 D5 SE Lux

Mar 27th, 2010, 11:22	#13
AidanC Senior Member Last Online: Feb 6th, 2024 11:22 Join Date: Jun 2007 Location: Kildare	Try giving it a bit of choke under hard accelleration at higher revs and see if it goes faster - its a bit crude but it'll show up leanness if its in any way significant. Other that that, just read the plugs and see how things go. __________________ My Volvos: '67 Amazon 131 '12 XC90 D5 SE Lux

Mar 26th, 2010, 21:59	#12
1966 122s Member Last Online: Apr 21st, 2013 20:05 Join Date: Dec 2008 Location: Ireland	Thanks Aidan, I have 1966 B18 (?? B18B), twin downpipes, Simonz sports exhaust. (The Exhaust really seemed to open up the top end.) Hence I guess I should go with the standard B18B jets as you have. Thanks for this !

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