carburetors manifolds length

pierodn

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Nov 10, 2012
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Hi.
My 1967 Atlas has the manifolds about 13 mm long.
On my 1968 P11 i have found the manifold about 26 mm long.
With 26 mm the new studs are a little short.
Please, what is the correct length of the manifold?.
Thank you.
Piero
 
the short ones. Also used on the N15

the long ones are Atlas. You can machine them down to P11 length - just make sure you leave the balance tube fitting in the part that's left.
 
Hi.
But my Atlas has short one 13,5 mm long.
Maybe the long 26 mm are for 650 SS?.
Thank you.
Piero
 
pierodn said:
Hi.
But my Atlas has short one 13,5 mm long.
Maybe the long 26 mm are for 650 SS?.
Thank you.
Piero
Click to expand...

My 1963 Atlas has the long 26 mm manifolds. Considering that the long manifolds made it near impossible to service the Atlas air cleaner, I always wondered why Norton did not use the shorter manifolds to gain a little more room.

Servicing the air cleaner, and the fact that it seemed to remove only large matter from the air, made me abandon it and use velocity stacks only.

I have no data, but the longer manifolds may improve mid-range torque.

Slick
 
texasSlick said:
pierodn said:
Hi.
But my Atlas has short one 13,5 mm long.
Maybe the long 26 mm are for 650 SS?.
Thank you.
Piero
Click to expand...

My 1963 Atlas has the long 26 mm manifolds. Considering that the long manifolds made it near impossible to service the Atlas air cleaner, I always wondered why Norton did not use the shorter manifolds to gain a little more room.

Servicing the air cleaner, and the fact that it seemed to remove only large matter from the air, made me abandon it and use velocity stacks only.

I have no data, but the longer manifolds may improve mid-range torque.

Slick
Click to expand...

Hi Slick,
My 1967 Atlas has short manifold with stock air cleaner.
Pieo
 
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