Cheburator

List,

I've been doing some thinking recently (a dangerous thing in itself!) - I have a set of S4 exhaust manifolds left over, which I am thinking of fitting on my Euro S2 to replace the **** cast iron ones. Would I need to do any modifications or is it a straight swap? I would imagine that I would need to cut the extra mounting holes, but that is about it?

Many thanks in advance,

Alex

milwaukeeshark

You need a spacer for the passenger side to connect up to the down pipe.

Cheburator

Thank you for the prompt answer. How thick is that spacer?

Jadz928

I don't believe the S4 manifold 3-bolt pattern will fit up to you S2 2-bolt pattern. You need the ones from the 85-86 32V

milwaukeeshark

If memory serves, it's 2 1/4 to 2 1/2 inches as the passenger side head sits further to the front.

Jadz928

MJ,
That reads about right. I remember when that dimension wasn't readily available. I think I was the first one to post it a long time ago.

hacker-pschorr

This is correct, the S4 manifolds do not bolt onto the 16V heads.

Jim bailey - 928 International

Only the 85-86 tubular stainless two bolt manifold will fit the 16 valve heads....and as mentioned the big down pipe triangular flange ends up in a different place do the the offset ports of the 2 valve heads and you need the 2 1/4-2 1/2 spacer tube .

hacker-pschorr

Or one made out of billet stainless

John Speake

Alex's car is a RHD car, would there be a problem fitting the 85/86 US headers (LHD) ?

PorKen

But for the weight, the cast iron manifolds are quite good. They have better internal flow shapes than the SS logs. Grind the outlets to the size of the 32V gaskets, ~55mm, and they'll flow as well, or better.

I gained 50(!) rwtq on my '81, just by porting the outlets, and using slightly larger (2" vs. 1¾") head pipes from a '86 cat.

Jadz928

The only relavant difference is where the steering column exits the firewall? And the US pax side manifold is further front?

I'm not seeing any problem.

drnick

ken, ive read your thread before but i am still not sure which bit you actualy ground on. was it the heads or the exhaust manifold?

drnick

and another question.. will an ott x pipe bolt up to the early style manifolds? i think alex and i are thinking along similar lines here, we both have headers to fit to our 32 valve cars and we both have project 16 valvers as well for the cast offs from the 32 v.

SMTCapeCod

I had an OTT X on my car with the stock manifolds for a while, fit OK. LOUD though.

Ken is talking about grinding the manifold ports where they meet the head, to match exhuast manifold to the port in the head. If you've got a ton of cash to burn, can always have them extrude-honed after that!