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AMC Carb manifold

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AMC Carb manifold

Post  rob spence on Sun Aug 20, 2017 4:01 pm

Can anyone help...I have a 20T AMC engine with no carb manifold. The carb is an Amal 376...the existing stub on the cylinder head is skewed with 2 studs attached. I presume there is a special 'skewed to horozontal' manifold for this engine?
Anyone have one?

rob spence

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Carb manifold

Post  piston 197 on Sun Aug 20, 2017 4:10 pm

Ah! there is no manifold on any AMC engine, what you have is a 17T barrel which has a 45 Deg. carb fitting, if this is fitted onto a 20T engine your piston will come out of the top of the cylinder !! unless you have the shorter stroke 17T crank fitted into it.
Only difference between a 17T and 20T engine is
1 cylinder barrel
2 carburettor
3 crankshaft
4 piston (if 17T engine No is below 3032 above this serial No, piston is common with 20T)

Everything else is interchangeable
The Amal 276 carb should bolt directly onto the correct 20T cylinder, but will not fit a 17T cylinder

JH
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piston 197
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Re: AMC Carb manifold

Post  rob spence on Sun Aug 20, 2017 4:15 pm

Oh flip.Any idea of the stroke of the 20T and the 17T so I can check which crank is in it?

rob spence

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Re: AMC Carb manifold

Post  rob spence on Sun Aug 20, 2017 4:24 pm

Just did a rough check and I have the 20T crank bottom end...and obviously a 17T barrel. Thanks for clarifying it at this stage!
I have a standard and plus 20 thou pistons. Anyone have a decent cylinder for a 20T?
Could swap for a standard bore 17T.

rob spence

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Yes !

Post  piston 197 on Sun Aug 20, 2017 4:27 pm

The 17T crank has a stroke of 62.68mm and piston is 59mm to give 171cc
The 20T crank has a stroke of 72.8mm and piston is 59mm to give 199cc

Both share the same numbered con-rods and flywheels it is just the difference between the centre line of the crank and big-end centre that determines the stroke, so should be easy to check, just measure conrod height at bottom and top of stroke if 62mm difference it will be 17T, if 72mm difference it will be 20T, if it is 62mm your barrel will work , and you need a new carb, if the stroke is 72mm you will need a new cylinder, but can use your carb !
JH
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Cylinder barrel

Post  piston 197 on Sun Aug 20, 2017 4:29 pm

I will have a look and see if I have anything, in either STD or +020, but doubtful, definitely do not need a 17T barrel , it will be a couple of days before I get chance
JH
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Re: AMC Carb manifold

Post  rob spence on Sun Aug 20, 2017 4:33 pm

Thanks JH

rob spence

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Barrel

Post  piston 197 on Mon Aug 21, 2017 10:42 am

Rob, yes have a STD 59mm 20T barrel , have sent you a p.m.

JH
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Re: AMC Carb manifold

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