HS6 carburettors pipe Q:---

ButterFingers

ButterFingers

Active Member
Hi there,
having refitted my carburetors after a full rebuild, one of the breather pipes goes to a charcoal filter on the passenger side of the engine bay , and the other just hangs and drops down into the depths of the engine area!
Is this correct?
as it is not connected to anything at the other end, would this tend to make the mixture weak on the drivers side carbie?
Should it be connected to something positive?
Peter
 
On my single charcoal HS6 car the float chamber vent goes to the charcoal canister then from the canister to a connection on the rear of the air filter assembly.
The bottom connection on the charcoal filter just vents with no pipe attached.
Hope that helps.
Clive.
 
Assuming you're talking about a v8 the breathers should go from each carb through a flame trap to the top of the rocker covers.

THere should also be a pipe and filter from the back of the air filter housing into the top of the crank case at the back of the engine.
 
hi there, thank you for your replys.
No, I am not talking about the breathers from the rocker covers to carbies.
On each carburetor is an exit pipe , just near the dashpot.
One, LHS, is connected to the charcoal filter and the drivers side (right hand side) RHD car, is not attached to anything and just vanished into the depths of the engine bay.
Should it be fixed to something positive?
Peter

PC273141.JPG PC273139.JPG PC273140.JPG
 
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on my Series 1, there is no filter, the thin pipes just run down the engine sides terminating adjacent to the sump. I replaced the originals a couple of years ago because they became quite brittle.Thought these were "overflow' pipes and was a little concerned if fuel would be contacting hot areas.

BTW is your Morris called "HG"?
 
On the late Australian cars fitted with HIF carbs there are two charcoal canisters on on each inner wing the carbs are connected to them. This is part of the Australian Design Riles requirements for the exhaust emission controls along with the 8.5 compression engines.
 
nzwoodie said:
On the late Australian cars fitted with HIF carbs there are two charcoal canisters on on each inner wing the carbs are connected to them. This is part of the Australian Design Riles requirements for the exhaust emission controls along with the 8.5 compression engines.
Click to expand...
That would ring true wouldn't it...

Quite why that would make a difference to emissions I'm unsure as it looks like it's bypassing the air filters. That's a similar place to where you'd plumb in Lpg....?
 
The WM shows a drawing of the installation with the following text

Control of evaporative emissions from the carburettors
A charcoal filled canister is situated on the left-hand wing valance to deal with evaporative emissions from the carburettors. During hot soak conditions, emissions from the carburettors are fed via a pipe to the top of the charcoal canister and are adsorbed on the charcoal. Then, under engine accelerating conditions, a small negative pressure in the carburettor elbow adaptor draws purge air through the atmospheric vent in the bottom of the charcoal canister, thus feeding the emissions trapped in the canister back into the engine through the pipe to the carburettor elbow tapping. An additional advantage given by this system is the prevention of an accumulation of fuel vapour in the intake system, which could cause hot starting difficulties.

There is only one pipe shown returning from the canister to the LH carb as you have yours. I don't think its a big deal that the RH pipe is drawing fresh air, it wont affect the fuelling.
 
Thanks cobraboy for the WM information, perhaps I could try connecting the RHS pipe to the charcoal filter via a T-junction, then I would be sure of not sucking fresh air to that carbie all the time?
Peter
 
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