Quote:
Originally Posted by top_man_eldo
Fred you sound like you know what you're talking about, why don't you make up a batch of these exhaust manifolds for the 180?!
I'll be the first to put my name down!  |
My knowledge of what works and what doesn't comes from building some rather interesting engines back in the 80's. Then things were limited by head flow capacity.
With modern multi valve heads, it's the bolt on bits that limit power from the factory instead. The KV6 seems to be worse than other engine in this respect. It's almost like MR Rover were worried about warranty claims, deliberately down rating the engine.
I did loads of mods to my first ZS180 some time in 2003. I did use the JS manifold and custom made system to match. I was never happy with the manifolds though.
It wasn't until I did some number crunching that I realised that the primaries need to be long.
With the KV6, it's all about optimisation and knowing what does and doesn't work.
The problem with making up manifolds and systems now would be sales volume. There just isn't the demand for them to make it a viable proposition.
This would leave you, the owner to find an exhaust fabricator willing to make a 1 off.
The JS manifold will work for most owners needs and it is miles better then the factory manifold. But it's far from optimal.
This was discussed at length some years ago on XPF.
I don't have a ZS180 any more.
I do still run a KV6, sadly it's coupled to an auto box in a Freelander!!