North American Spec Engines

[Hutch100]

Hi,
North American spec engines what is the difference between these and UK spec engines. Anyone out there help me please.

[malc4d]

Lots of vacuum pipes...............What year, Mk1 or 1.5 ?

[Westfaling]

Yes lots of extra tubing much of it connected to a tank on the left hand strut turret. But as for the engine itself. Lower compression ratio (I think mainly achieved by flat top pistons). The carbs are different for improved emissions (no sure how but everyone advised me to ditch them). The distributor advance curve is also different - again for emissions. The North American engines seemed to have Mk2 cooling plumbing - at least they did in 1972. I don'tt suppose many Mk2 cars made it to the States as they stopped exports in 73 as far as I'm aware.
Nick

[darrellprice]

Here is a photo of a Mk 2 Federal Stag from Seattle that I see once a year, I use it as a reference as it is as near original as you will find. My car has been modified a fair bit so I included this photo instead of mine. This car has air conditioning, hence the huge pump on the left hand side of the engine and plumbing by the hood catch. The carbon canister, to capture fuel vapours, is on the right hand side (black canister). There are differences between 1972 (MK 1) and 1973 (Mk2) cars. As others said, mostly around vacuum pipes, compression ratio, and carburettors. The James Taylor book goes in to great detail about the differences, if you tell me the year maybe I can offer more detail?
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