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Author Topic: Carb body pipe  (Read 2258 times)
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Nigel
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« on: May 25, 2023, 06:56:20 PM »

Hi all,
My carb, 34 DATR 2/250 has this pipe, which is blanked off.

Where does it connect to?

Thanks
Nigel


* 20230523_carb_resized_1.jpg (337.86 KB, 750x1000 - viewed 333 times.)
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1984 2.0 Carb HPE [ex Aus] Grigio Finanza.
2007 Mazda 6 2.3 [current daily, highly recommended]
The past:
1980 2.0 HPE White in South Africa [hope it survives!]
1976 1.6 Coupe Lancia Blu [PFG 76R] [probably deceased]
oh,and an Uno Turbo 1997 also in SA [stolen,never recovered]
mangocrazy
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Graham Stewart


« Reply #1 on: May 25, 2023, 07:24:30 PM »

Hi Nigel,

Is that the return to the fuel tank on mechanical fuel pump carbs? I know I blanked off a similar spigot on my DATR when I fitted the Huco electric pump. The mechanical pump carries on regardless so needs a return, whereas the electric pump senses pressure and stops when the float bowl is full.

Graham
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1980 Lancia Beta Spider 2000 (S2FL)
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Nigel
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« Reply #2 on: May 25, 2023, 09:30:26 PM »

Hi Graham,
No, the fuel return spigot is next to the inlet spigot on the top
section. This is low down just above the base.

Nigel
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1984 2.0 Carb HPE [ex Aus] Grigio Finanza.
2007 Mazda 6 2.3 [current daily, highly recommended]
The past:
1980 2.0 HPE White in South Africa [hope it survives!]
1976 1.6 Coupe Lancia Blu [PFG 76R] [probably deceased]
oh,and an Uno Turbo 1997 also in SA [stolen,never recovered]
mangocrazy
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Graham Stewart


« Reply #3 on: May 25, 2023, 09:39:44 PM »

Hi Nigel,

As I was writing it I thought 'Nigel would know this anyway'...

Graham
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1980 Lancia Beta Spider 2000 (S2FL)
2002 VW Transporter T4
2017 KTM Duke 690R
2008 Aprilia SL1000 Falco
1992 Ducati 888 SP3
1988 Honda VFR750F
1980 Yamaha RD350LC
Neil-yaj396
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1979 1300 Coupe


« Reply #4 on: May 26, 2023, 09:15:40 AM »

My carb isn't exactly the same but it has similar take offs for the vacuum advance and a small bore pipe that connects back to the air filter. No idea as to the purpose of the latter....
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JohnFol
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« Reply #5 on: May 26, 2023, 03:03:46 PM »

On mine, pipe to vacuum advance is far left, you'll see it connected in my attached image. However I have an additional diaphragm covered by 3 bolts . . .


* PXL_20230526_135537720.jpg (1337.23 KB, 3072x2431 - viewed 332 times.)
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squiglyzigly
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« Reply #6 on: May 26, 2023, 07:54:12 PM »

Hi Nigel,
Pretty sure that pipe connects to the underside of the air filter housing. It locates on a spur from the block breather hose.

Im not completely sure but I believe it’s to reduce the amount of oil mist entering the air filter housing during idle. During idle the oil mist won’t readily get sucked into the carb and will cause a bit of a mess in the air filter housing. With the pipe connected it sucks some of the breather the mist straight from the spur into the inlet manifold as this pipe is drawn in below the carb butterflies. This is under max vacuum at idle. 

Not the easiest picture to take but here it is on my 2.0 Berlina which also has the DATR 2/250

Ian


* IMG_3615.jpeg (319.86 KB, 961x1280 - viewed 318 times.)
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Nigel
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« Reply #7 on: May 26, 2023, 09:20:38 PM »

Thanks for all the info guys.

Bottom line is she's not running perfectly, especially
when cold, and still has a flat spot. I've tried various jet
sizes over time, none have really solved the issues. It appears that
blanking off this spigot has no detrimental effect to the operation of
the carb itself.

I'm actually now looking at a fuel injection kit, essentially bolt-on
to the existing manifold, with all the bits required to make it work.

Nigel
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1984 2.0 Carb HPE [ex Aus] Grigio Finanza.
2007 Mazda 6 2.3 [current daily, highly recommended]
The past:
1980 2.0 HPE White in South Africa [hope it survives!]
1976 1.6 Coupe Lancia Blu [PFG 76R] [probably deceased]
oh,and an Uno Turbo 1997 also in SA [stolen,never recovered]
peteracs
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Peter Stokes


« Reply #8 on: May 26, 2023, 11:02:36 PM »

Hi Ian

A bit late on this one, but you are correct in where it goes. No idea on function, but your suggestion makes sense.

Peter
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squiglyzigly
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« Reply #9 on: May 27, 2023, 08:58:18 AM »

Hi Peter,
I did wonder if it helped emissions is some way but seeing as the crank breather pipe is already plumbed into the airbox I couldn’t see this being any kind of emission improvement.

Ian
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VX HPE (resto started Sept ‘21)
Beta Saloon 2.0l s2 1979 (completed July 2020)
Beta coupé VX (completed April 2017)
JohnFol
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« Reply #10 on: May 28, 2023, 10:24:33 AM »

It is not just connected to air filter, there is a T piece that takes it to vacuum advance on distributor.
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JohnFol
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« Reply #11 on: May 28, 2023, 10:28:59 AM »

Red to carb that you have blocked,  blue to distributor and green to air box


* Carb Vacuum coloured.jpg (180.3 KB, 998x621 - viewed 302 times.)
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mangocrazy
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Graham Stewart


« Reply #12 on: May 28, 2023, 01:54:42 PM »

Red to carb that you have blocked,  blue to distributor and green to air box

You have an unfeasibly clean carburettor, John...  Grin
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1980 Lancia Beta Spider 2000 (S2FL)
2002 VW Transporter T4
2017 KTM Duke 690R
2008 Aprilia SL1000 Falco
1992 Ducati 888 SP3
1988 Honda VFR750F
1980 Yamaha RD350LC
Nigel
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« Reply #13 on: May 28, 2023, 07:01:29 PM »

Hi John and all,
I don't have a Vac advance on the distributor, so there's actually
nowhere to connect to.

And thanks to Peter who brought me back to the basics somewhat.
The goal was to get the thing running better. The float level is now
slightly higher and I've gone back to factory jetting. The difference
is outstanding. She's idling better, the flat spot is vastly improved,
and driving is back to pleasure.
I'm going to continue fettling a little before the trip to Hawkchurch.

Thanks all, Nigel
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1984 2.0 Carb HPE [ex Aus] Grigio Finanza.
2007 Mazda 6 2.3 [current daily, highly recommended]
The past:
1980 2.0 HPE White in South Africa [hope it survives!]
1976 1.6 Coupe Lancia Blu [PFG 76R] [probably deceased]
oh,and an Uno Turbo 1997 also in SA [stolen,never recovered]
JohnFol
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Posts: 389



« Reply #14 on: May 29, 2023, 03:26:57 PM »

Thank you. Wife not too happy when she saw the inlet manifold in the oven curing the paint.
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mangocrazy
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Graham Stewart


« Reply #15 on: May 29, 2023, 03:31:59 PM »

Thank you. Wife not too happy when she saw the inlet manifold in the oven curing the paint.

I recall similar when using the airing cupboard as an impromptu spray booth. There was nothing else in there, but...
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1980 Lancia Beta Spider 2000 (S2FL)
2002 VW Transporter T4
2017 KTM Duke 690R
2008 Aprilia SL1000 Falco
1992 Ducati 888 SP3
1988 Honda VFR750F
1980 Yamaha RD350LC
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