Hi Guys, i'd like some opinions please
I am planning to make a exhaust manifold for my twin turbo set-up using 90* elbow and tee butt weld fittings (i think in the USA you call them weld-els). I was going to use fittings with a 2" internal dia, but these have a 2.5" outer diameter and won't fit between the flange bolts on the cylinder head.
The biggest that will fit are the 1.5" pipe fittings (1.5"internal, 1.9" external diameter).
The motor is a 250, 8.0:1 CR, 274/274 112* cam, 1.65 rockers, alu head/intake, running up to 10 psi from twin T25 turbos.
The manfold will be split, 1-2-3 and 4-5-6, each 3 feeding one turbo.
So on to my question. Do you think an internal diameter of 1.5" will be too restrictive on the exhaust?
Anothet option would be using 2" fittings and some 1.5 - 2" reducers at the ports. However this will make the manifold quite wide, probably 7" and may cause clearance problems with the shock tower, bodywork etc?
What do people think would be the best option?
Thanks
Nathan
I am planning to make a exhaust manifold for my twin turbo set-up using 90* elbow and tee butt weld fittings (i think in the USA you call them weld-els). I was going to use fittings with a 2" internal dia, but these have a 2.5" outer diameter and won't fit between the flange bolts on the cylinder head.
The biggest that will fit are the 1.5" pipe fittings (1.5"internal, 1.9" external diameter).
The motor is a 250, 8.0:1 CR, 274/274 112* cam, 1.65 rockers, alu head/intake, running up to 10 psi from twin T25 turbos.
The manfold will be split, 1-2-3 and 4-5-6, each 3 feeding one turbo.
So on to my question. Do you think an internal diameter of 1.5" will be too restrictive on the exhaust?
Anothet option would be using 2" fittings and some 1.5 - 2" reducers at the ports. However this will make the manifold quite wide, probably 7" and may cause clearance problems with the shock tower, bodywork etc?
What do people think would be the best option?
Thanks
Nathan