Twin Cam Exh Manifold

Twin Cam Exh Manifold

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hemibum

Original Poster:

833 posts

223 months

Monday 21st January 2008
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Hi, forgive my ignorance, but the exhaust manifold on our Twin Cam engined kit car is rather perforated. Does any other Ford manifold fit this engine? Thanks .

Sam_68

9,939 posts

251 months

Monday 21st January 2008
quotequote all
No, 'fraid not (I assume you are talking about the Lotus-Ford 1558 Twin Cam used in the Elan/Europa?).

You can get tubular manifolds quite readily from the specialists (eg. Paul Matty), but the cast manifolds used on earlier variants are now becoming quite rare, as they have a tendency to fracture at the mounting flanges.

Whether a tubular manifold will fit depends on the car, of course. What type of kit is it fitted to?

hemibum

Original Poster:

833 posts

223 months

Monday 21st January 2008
quotequote all
Aah, right. It is the 1558cc jobbie, allegedly with a big valve head. The car is a Locust, one of the Seven type copies. The actual configuration of the manifold shouldn't present too much of a problem, there's always scope for modification to make fit.smash

Sam_68

9,939 posts

251 months

Tuesday 22nd January 2008
quotequote all
The standard Elan manifold might not be much good. It's a 4-2-1 system that comes into one at a y-piece alongside the bottom of the bellhousing, then runs back underneath the car.

What you presumably want will be a manifold that exits through the side of the engine bay, to connect to a side mounted silencer?

Obviously, Lotus/Caterham fitted the Twin Cam into the Seven, so you'd be better off buying a manifold from Caterham than trying to adapt an Elan manifold.

hemibum

Original Poster:

833 posts

223 months

Tuesday 22nd January 2008
quotequote all
eek £583.00 for an exhaust from Caterham!yikes

Sam_68

9,939 posts

251 months

Tuesday 22nd January 2008
quotequote all
hemibum said:
eek £583.00 for an exhaust from Caterham!yikes
rofl That's the problem when you fit £3K's worth of engine to £1K's worth of car!

To be fair, that sort of money is buying you a high quality full exhaust system that's specifically designed to work with the engine.

Your alternative is to manufacture something from a kit of tubes such as Custom Chrome supply. About 1/5th of the cost, but you're never going to get close to the quality and if you factor in the cost of your own time, it's not even very cheap!

If you really want to stick to a budget, hunt Ebay for an early cast iron Twin Cam manifold. As I said earlier, they are getting rare, because they tend to crack at the flanges, but it would give you a single downpipe connection that is extremely easy to link to the rest of whatever system you choose. They are not very efficient, though, and will strangle the power of the engine to some extent is it is a Big Valve.