engine/carburettor vacuum hoses

NOW THATS WHAT I CALL HELP You won't get this sort of help anywhere else, great group of people, I don't need this info myself but it makes you feel good to feel part of it. Thanks Clifford Richard

B230k engine on solex cisac carb 

Well Clifford I cannot beleave just how well you have described all the pipes and various connection's!Only yesterday I took my camera to my old car knowing it had the same system fitted,I tried tracking the pipes but lost some where they disappeared under manifold's etc.although I never had problem's with my car i can sympathise with EYB,I never did get round to understanding the maze of pipework. Like you if any pictures of certain bit's are needed then I may be able to take some specific shot's. Very well done!!!! :WeAreNotWorthy: :baffled: :confused_smile: :Banane59:

Clifford, you pretty much covered everything. I had to replace the pulseair pipe on my 87 GL about six years ago. I have owned my car from new so it was the first one. The pulseair system draws some of the exhaust bypass and routes it back throught the carb. The carb draws from both the pulsair side, and from the crankcase via the flame trap. Over a protracted period of time, the fuel, exhaust, and oil combine to form a rock solid "coke" in the metal pipe. I removed each hose from the carb, and discovered that some of this rock solid material was forming in some of the rubber hoses, and it was a challenge to clean it out. Pulseair is the Volvo trade name for EGR, i.e., Exhaust Gas Recirculation. A form of this type of deposit builds up in the flame trap, and, once completely clogged, will cause the crankcase gasses to overpressurize the crankcase, and if the system performs as designed, will blow the safety plug out from the backside of the valve cover.

The pulseair portion of the circuit begins at the "gulp valve" where the black hose from the breather hooks into it. I say gulp because of the noise it makes when the fresh air hose is removed while the engine is running. The fresh air is drawn from the front of the circuit at the valve. The fresh air is drawn in from the front of the circuit to dilute the raw exhaust being drawn from the engine, through the pipe to the carb. Metaphorically speaking, the Solex Cisac is one hell of a good bartender. It has to add the input from the pulseair to the draw from the crankcase via the flame trap hose, meter in the correct shot of ambient air and petrol to achieve the correct detonation. A lot of B230K owners erroneously blame the carb for poor performance problems, when in essence, the problem is that of a problem upstream from the carb which has adversely affected the bartenders ability to mix the proper cocktail.