Make the change, but keep the emission parts so that when the emission laws pass
in your area (and they will, eventually) you can put it back right to keep it on
the road.......
William Gilroy wrote:
> I started my conversion from a single ZS to dual HS4 on my 1977 Midget.
> As I started to disassemble my car I found a small crack in the exhaust
> manifold. It has not cracked through yet, but knowing my luck it will
> happen. I could just reassemble it and hope for the best, or I could
> upgrade to a header for my 1500cc. Since much has changed on my car,
> non-original dizzy, not much emission hardware, missing air pump I think
> I am going to convert it to a UK spec engine. I was reading my Bentley
> manual and this is what I found. The UK cars had dual SUs and no emission
> stuff, no evaporating canister, and no EGR valve.
>
> This is my plan and I was wondering what the list thinks, any thing I
> should watch out for and what have I forgotten.
>
> 1. Replace the ZS with dual HS4s and a UK spec manifold. The HS4s
> that I have are not plumbed for an evaporative system.
> 2. Remove the evaporative canisters and hoses and plug the vent
> line on the gas tank.
> 3. Use a vented gas cap.
> 4. Replace the cat and exhaust manifold with a header. Any ideas
> on what kind. If I keep the exhaust manifold (and hope the crack
> goes no further) just plug the holes for the air rail and the
> EGR valve.
> 5. Try to figure out if I have the correct advance curve and vacuum
> hoses for the engine and dizzy. LOK.
>
> Is there a problem with a UK spec vented gas tank in an enclosed garage that
> is attached to the house? If I burn down the house and kill the dog I am
> in deep do-do.
>
> One other thing I noticed the intake passages on the stock 1500 manifold are
> 1" and the HS4 manifold is an 1 1/4". Big difference.
>
> ------
> Bill Gilroy
> w.gilroy@verizon.net
> 77 Midget
> 90 Shar-Pei
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