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Hs4 Carb. Is This Right?


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#1 BaronVonchesto

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Posted 17 November 2017 - 01:57 PM

Do take a look at the attached pic. One of the tubes from the float housing is just exposed with nothing connected to it. Where is this supposed to go?

#2 BaronVonchesto

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Posted 17 November 2017 - 02:05 PM

ebelad.jpg

Sorry forgot the pic

#3 BaronVonchesto

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Posted 17 November 2017 - 02:08 PM

Is that the fuel overflow? If yes, is it not dangerous for it to drain out to the engine bay?



#4 nicklouse

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Posted 17 November 2017 - 02:26 PM

should have a hose/pipe taking it down to below the subframe. clutch side.

#5 Pauljb

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Posted 17 November 2017 - 03:46 PM

Yeah its the fuel overflow pipe. it's designed for when the float sticks open so you don't over-fuel the carb/ car. Like nicklouse says, it should have a pipe that goes past the subframe on gearbox side.



#6 Spider

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Posted 17 November 2017 - 07:28 PM

should have a hose/pipe taking it down to below the subframe. clutch side.

 

Is that how they were done in the factory in the UK?

 

I don't know that one. Over here, prior to our cars getting emission control, there was no tube for the overflow, just a hole with a cover over it. When we did get emission controls, part of that was a vapour recovery system that had a charcoal canister, and this was vented back to that.

 

Putting an open pipe on it makes sense, I was just curious as to how the UK cars were assembled in this regards.



#7 Retroman

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Posted 17 November 2017 - 07:44 PM

Yep they left the factory with the breather / overflow pipe

Not sure on the exact year but 80's, the pipe ran down the front of the clutch housing (2 5/16th clips I think) and straight down towards the floor below the subframe



#8 jabos7

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Posted 18 November 2017 - 01:23 AM

Great pic of the capped-off oil-breather inlet -- what do you do if you snag an HS4 that never had that fitting drilled out and mounted?

Any good alternative locations to pull those gasses into the manifold?



#9 nicklouse

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Posted 18 November 2017 - 02:11 AM

 

should have a hose/pipe taking it down to below the subframe. clutch side.

 

Is that how they were done in the factory in the UK?

 

I don't know that one. Over here, prior to our cars getting emission control, there was no tube for the overflow, just a hole with a cover over it. When we did get emission controls, part of that was a vapour recovery system that had a charcoal canister, and this was vented back to that.

 

Putting an open pipe on it makes sense, I was just curious as to how the UK cars were assembled in this regards.

 

mmm they also had that metal plate. to be honest the pipe and hose may have been from Metro on. metal pipe bolted onto the clutch cover and venting by the starter.  but i am fairly sure there was also one that went between the rear of the subframe and the bulkhead.



#10 Spider

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Posted 18 November 2017 - 03:03 AM

Retroman & Nick - cheers guys :shades:



#11 Rorf

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Posted 18 November 2017 - 05:41 AM

South African minis also had this arrangement, only problem if leaking onto the ground you would not be aware of the problem whilst driving apart from heavy fuel consumption.

 

Better to let it drop onto the exhaust manifold then you will soon know you have a problem :ohno:  :X  ;D



#12 Retroman

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Posted 18 November 2017 - 01:41 PM

Great pic of the capped-off oil-breather inlet -- what do you do if you snag an HS4 that never had that fitting drilled out and mounted?

Any good alternative locations to pull those gasses into the manifold?

   The alternative is into the air filter, has to be upstream of the butterfly.

You can't really vent straight into the manifold as the tickover will be erratic at best or very high.

I have run an 'evacusump' setup before now taken from Vizards book which was a lot of brazing and plumbing, not sure it really worked as its a difficult thing to evaluate, but the old 999cc S would pull 90 in 3rd even with a 4.3 diff and 1.08 drops.

The evacusump used the 'suction vacuum' from the exhaust, some said it would backfire up the pipe work, but it never gave any problems.

You can see the evacusump can next to the carb...still cant believe how untidy the engine bay was...!!

 

z6hXCrh.jpg



#13 BaronVonchesto

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Posted 18 November 2017 - 03:50 PM

Great pic of the capped-off oil-breather inlet -- what do you do if you snag an HS4 that never had that fitting drilled out and mounted?

Any good alternative locations to pull those gasses into the manifold?

Interesting that you should say that. Just this morning after posting this question I took off the K&N filter on the crankcase breather, and that capped off inlet and connected a hose between the two  :lol:



#14 jabos7

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Posted 18 November 2017 - 04:37 PM

Retroman--

 

That's quite a set-up!  I'm assuming the hose goes into the filter backplate?

How would it be secured?



#15 Retroman

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Posted 18 November 2017 - 06:32 PM

   The evacasump setup was totally separate from the carb and filter.

The idea is to make the engine run as clean and efficiently as possible by creating negative pressure in the crank-case this stops anything going up past the rings in theory....and hence no connection to carb or filter. By doing that it means the mixture is not diluted, and any fume is burnt off in the exhaust.

   The one in the photo has a copper pipe brazed into the LCB Y piece this creates suction and is connected to the 'tin' (literally) at the top. The Y piece end has a silicon hose and the other hoses are connected to rocker cover / flywheel breather / timing breather (this was belt drive cam).

What you can't see is the pipe from the bottom of the tin down to the fuel pump 'port'. A bit like on a turbo engine that worked to drain anything back to the sump.

   It wasn't secured in any way...with 6 pipes connected to the tin it could hardly move. It was a pretty basic thing, and as I said difficult to know if it worked, like most engine related mods it needs dyno time to know / prove.

  If I ever do another I would make it simpler...!!






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