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Inlet manifold drains

Posted by mgc pete

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Inlet manifold drains #1
mgc pete Peter Hedges Southampton, United Kingdom	Posted: May 30, 2012 02:39PM Registered: 2 years ago Posts: 3

The two drain lines in the middle and rear of the inlet manifold have been plugged by the PO, my question is whether it is worth re-instating the drains or does it cause problems with fuel/air mixture?

Is there any info on what size the lines should be, threads etc.

What are your thoughts ?

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Re: Inlet manifold drains #2
billboy750 Bill M North East Engand, United Kingdom	Posted: May 31, 2012 01:33PM Registered: 1 year ago Posts: 94

Hi Peter
I would keep them blocked off, who would think of introducing air leaks on a manifold?? Only BMC.
I ran my C for 7 years with them blocked off, with no problems. This winter I changed to a three carb set up, fantastic.
Bill

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Re: Inlet manifold drains #3
mgc pete Peter Hedges Southampton, United Kingdom	Posted: May 31, 2012 04:57PM Registered: 2 years ago Posts: 3

Cheers Bill, that was the reply I was hoping for.

I have been running with them plugged for some years with

no noticable problems, so best leave 'em.

Realy envy your triple setup, what manifolds are you using?

Anyhow thanks for your input.

Pete.

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Re: Inlet manifold drains #4
billboy750 Bill M North East Engand, United Kingdom	Posted: May 31, 2012 06:02PM Registered: 1 year ago Posts: 94

Hi Pete.

I used three MANIFLOW manifolds

Bill

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Re: Inlet manifold drains #5
PFT-000 Bruce Ibbotson Brisbane, Australia 1968 MG MGC GT "The Truck"	Posted: June 01, 2012 11:10PM Registered: 11 months ago Posts: 399

Pete,

Bill Murray is exactly right. Get a set of manifolds and the additional SU and most of the MGC deadness will dissapear as if by magic, also source a set of (Downton copy) exhaust headers and build the dual exhaust system.
This transforms the dull and dead, little torque and power into the engine as it should have been built.
The factory inlet manifold simply starves # 1 & 6 cylinders which is why it didn't go as a 3 litre engine should.

Head work is very beneficial but the manifolding is the key. Economy should improve. Use ST needles and try C1W needles when you have it sorted out. Downton supplied C1W needles with their Kit 45.

Good Luck,
Bruce.

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Re: Inlet manifold drains #6
mgc pete Peter Hedges Southampton, United Kingdom	Posted: June 02, 2012 11:09AM Registered: 2 years ago Posts: 3

Bruce,

Great advice, your right with what you say and I think thats the way most of us are working towards, just takes time to build up the funds.
Engine worked,including head worked, thanks to Steve Curtis, exhaust headers added later, now saving for the inlets and extra carb.

Hopfully it wont be too long!

Cheers Pete.

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