Is it possible/ sensible to run this combination? If so where should the vac feed come from? It's a 1600 type 1 engine. Thanks very much
Yes - from the vac port at the bottom, facing away from you to the left as you look in works for me. Block same on other carb. It's the only port they have so can't go wrong.
never fitted ICTs but have a look in the throat of the carb from below....if there's a tiny hole inline, or just below, the closed butterfly, this is for ported vacuum....presumably you'll want to have a balance pipe between the two and T off.....may be way off the mark, so only a best guess
If you have CB performance manifolds you can fit a balance pipe between the manifolds to help with balancing the carbs.
You can fit a balance pipe with empi manifolds too! Just drill, tap and screw in some fuel barbs for the pipes (making sure that you angle them right so you can put the HT cables on the plugs or buy silicon bendy leads) Combination works well, better than a 009 but just make sure you get the carbs jetted right.
No brake servo to worry about for me. Don't think they'd invented tgem yet wgen tgey made my bus. @Dr Ben do you know what jets I should be using. These carbs were pre-loved when I got then
You're not quite right... the vac signal is either in-line or slightly above the butterfly... if it was below, then the vac signal would go to max when the throttle is closed... Holes below the butterfly are for the idle circuit!! Balance pipes are always between manifolds and are never on the actual carb body
Thanks Paul. So the outlets ive got with the black pipes on at the moment arw not what I need for the dizzy?
No, they will be... The thing with carbs, is that the vac point on the outside, won't always line up with the hole on the inside They like to have funky routes and miniature galleries
Check what you have first, a lot of peeps give up on these because of the totally useless (for our application) emulsions they come with. They come with F78 whatever you ask for. These have too many holes and in combo with the pump and idle, when you atempt to accelerate they flood the engine causing a kangerooing flat spot. Arse. Change for F6. 57 idles Mains and airs debateable, the pumps will be ok. Mains/Airs some would say 135 and 165 Some would say 145 and 170 It's a black art particularly where the emulsions are concerned because these have a huge effect on all the rest. They are cheapish though so I'd suggest start small with mains and airs. Start it up, warm up then increase the revs gently. If it starts to pop when you get onto the mains, they're too small.
