im off to collect an rst engine tomorrow i won on ebay, just wondered what numbers i should be looking out for to see if its for a turbo or not. its suposedly out a series 2. its got the rs rocker cover but any1 can put 1 of them on.cheers, lukes1.

 

it should have a oil return pipe in the front of the block where the turbo returns oil into it..

 

what about the head?

 

Thats a hard one mate

As has been said, the oil return is probably your biggest and only give away.

The head could have many numbers on it, depends if its the original head for one!

 

the shape of the exhaust ports are a give away, but that means manifold off bread shape (square botom round top) for N/A and round for turbo AFAIK

 

Not on a series 2

 

ok, more round than a sqaure or bread shape, but not as round as a circle. . that better?

 

Still doesn't change the fact a Series 1 Head is different to a Series 2 head?!

 

Any use....

The primary identification without taking the engine apart is to go by the casting number on the inlet port side of the cylinder head. The first two digits indicate the design year of the head.

81SM6090 - pre 1986 hemi head (1600 Escort, Fiesta XR2, Bosch K XR3i etc)
There are two variants of this head. The standard casting and the rare cross-hatch casting. The standard casting has a plain flat finish to the external sides of the head. It's a good head for standard or 43.5mm valves. The cross-hatch casting has a ribbed cross-hatch pattern on the external sides and has thicker port walls and a better port shape. Only the cross-hatch casting can be used for 45mm valves.
86SM6090 - Lean burn head on post 1986 carb engined models.
88SM6090 - Generally these are hemi heads on the few carb engines that didn't go to leanburn in 1986 (Some Escorts/Orions I think) but see below. Essentially similar to the 81SM head but fairly rare to find one. I suspect the only intended difference is they'll have seat inserts fitted designed specifically for unleaded fuel. However, they also tend to have very bad port shapes and can't be modified for good flow or you'll break into a waterway. Best avoided even for ported standard valve work and absolutely no good for big valves.
88SM6090 - Just to confuse things some of the 88SM heads are leanburn although I've only come across a couple in 15 years.
89SM6090 - The EFi hemi head from Bosch L Fiesta XR2i's and XR3i's. Also has the injector cutouts in the inlet ports and therefore won't take a DCOE manifold without welding or other tinkering. Good head for big valves though as the port walls are very thick and the port shapes are excellent for flow.


More information here - http://www.pumaracing.co.uk/CVH.htm

 

Good information, pulled from Puma Racing i see

BUT, as i said above, its useless if its not the original head